Tshibubudze A., and Hein K. (2016). Geochem. Soc. Although the lakes on the flanks of Mt Kenya weigh in this distribution, caldera and crater lakes do not deviate more from El = 1 than maar lakes do, hence suggesting that maar lakes in Africa appear more elongated with respect to maar craters worldwide. *Correspondence: Dmitri Rouwet, dmitri.rouwet@ingv.it, Volcanic Lake Dynamics and Related Hazards, View all 1 (1), 150. 106 (3-4), 217242. Visoke is around 3,711 meters above sea level located on the border with the Democratic Republic of the Congo. Science. During the 9th Workshop of the IAVCEI Commission on Volcanic Lakes (March 2016), Barombi Mbo (Maley et al., 1990; Kling et al., 1991; Tchamabe et al., 2013; Figure 4D), the maar lake with the largest surface area in Cameroon (Table 1), was subjected to a pioneering physical limnological and fluid geochemical survey. 74, 861871. Characteristics of Chemical Weathering and Water-Rock Interaction in Lake Nyos Dam (Cameroon): Implications for Vulnerability to Failure and Re-enforcement. From a hazard perspective, there is an urgent need to tackle this task as a community. Res. The Mount Manengouba, A Complex Volcano of the Cameroon Line: Volcanic History, Petrological and Geochemical Features. 28 (3), 173184. Aquat. 76 (5), 817. doi:10.1007/s00445-014-0817-7, Rumes, B., Eggermont, H., and Verschuren, D. (2005). Also called a stratovolcano (a term for a very large volcano made of ash, lava, and . The Volcanic Lake of Tritriva, Central Madagascar. (1999). Geochem. The Lake Natron Footprint Tuff (Northern Tanzania): Volcanic Source, Depositional Processes and Age Constraints from Field Relations. Recent insights on the chemical and stable isotopic composition of 17 of the 33 Cameroonian volcanic lakes came from Issa et al. doi:10.1016/0377-0273(89)90056-5, Kusakabe, M., and Sano, Y. doi:10.1016/j.jvolgeores.2019.04.009, Cabassi, J., Tassi, F., Mapelli, F., Borin, S., Calabrese, S., Rouwet, D., et al. Volcanoes in the back are Oldoinyo Lengai (left) and Kerimasi (right). Gas Discharge at Lake Nyos. Lett. Only 4% of the AR ratios are above 0.96, whereas 17% are below 0.5. [1], The metamorphic rock of the WAC include, but are not limited to, high-grade amphibolite facies amphibolite, gneiss, paragneiss schist, calc-silicate rock, and migmatites. Geochem. The absence of a high gradient in yearly atmospheric temperature, and thus lake surface water temperature, favors meromixsy (e.g. Final Remarks and Strategies for Future Research, https://doi.org/10.3389/feart.2021.717798, https://volcano.si.edu/search_volcano.cfm, https://www.google.it/intl/it/earth/index.html, https://vhub.org/groups/iavceicvl/resources, https://www.youtube.com/watch?v=XsgoWl728hM, https://iavceicvl.files.wordpress.com/2018/07/iwgcl-cvl-newsletters.pdf. A. Res. steam heated SO4-rich lakes), 4) medium activity (a and b, for higher and lower solutes contents, respectively) (i.e. (1997). Res. Coupling Algal Biomass Production and Anaerobic Digestion: Production Assessment of Some Native Temperate and Tropical Microalgae. Volcanic lakes pose specific hazards inherent to the presence of water: phreatic and phreatomagmatic eruptions, lahars, limnic gas bursts and dispersion of brines in the hydrological network. The 1986 Lake Nyos Gas Disaster in Cameroon, West Africa. doi:10.1016/j.biombioe.2014.08.027, Franz, G., Breitkreuz, C., Coyle, D. A., El Hur, B., Heinrich, W., Paulick, H., et al. 75, 683. doi:10.1007/s00445-012-0683-0, Caliro, S., Chiodini, G., Izzo, G., Minopoli, C., Signorini, A., Avino, R., et al. Besides Lake Nyos and Lake Monoun, the Oku Volcanic Field in NW Cameroon (Figure 1C) hosts 13 other maar lakes (Table 1). J. Afr. (2017). A 40,000-yr Pollen and Diatom Record from Lake Tritrivakely, Madagascar, in the Southern Tropics. Spec. [6], Within the West African Craton, there is a large amount of mining activity covering resources such as gold, copper, cobalt, silver, tin, and zinc. Editors D. Rouwet, B. Christenson, F. Tassi, and J. Vandemeulebrouck (Heidelberg: Springer), 401425. Kling et al., 1989; Giggenbach, 1990; Giggenbach et al., 1991; Freeth, 1992; Evans et al., 1993, 1994; Freeth, 1994; Martini et al., 1994; Zhang, 1996, 1998; Viollier et al., 1995, 1997; Aeschbach-Hertig et al., 1996, 1999), to such a degree to have introduced a Nyos bias for the good and the bad on how to cope with lakes in volcanic craters in terms of hazard assessment and risk mitigation strategies (Rouwet et al., 2015a, 2019; Rouwet, 2021). Rev. [1] Cratons themselves are tectonically inactive, but can occur near active margins,[2] with the WAC extending across 14 countries in Western Africa, coming together in the late Precambrian and early Palaeozoic eras to form the African continent. These islands grew over a hotspot as in the Hawaiian islands and all but one has active volcanoes. An Efficient Method for Measuring CO2 Concentration in Gassy Lakes: Application to Lakes Nyos and Monoun, Cameroon. Volcanol. As South Africas principal watershed, the Drakensberg Mountain is the Orange Rivers source. 10 (3), 303310. The night sky shimmered with a crimson hue as lava, sometimes piling up to three stories high, speedily invaded the streets of several villages surrounding Goma and swallowed any buildings it encountered, setting, Copyright 1996-2015 National Geographic SocietyCopyright 2015-2023 National Geographic Partners, LLC. Deep Sea Res. Palaeoecol. The irregular shape of the 3km-wide collapse caldera and its crater lake is in agreement with the presumed young age of the crater and the latest magmatic eruption (<1ka; Fontijn et al., 2010). doi:10.1029/tc008i001p00117, Eggermont, H., Heiri, O., and Verschuren, D. (2006). Final Step of the 32-year Lake Nyos Degassing Adventure: Natural CO2 Recharge Is to Be Balanced by Discharge Through the Degassing Pipes. doi:10.1016/j.jvolgeores.2008.08.011, Nmeth, K. (2004). Here we introduce the updated, interactive and open-access database for African volcanic lakes, country by country. It emphasizes the importance of valuing and seeking wisdom from older we who have valuable insights to offer. The CVL is often interpreted as resulting from failed rifting following continental break up starting 120Ma ago (Fitton, 1983; Aka et al., 2004); volcanism in Cameroon and the southern islands hence occur along this aulacogen (Figure 11A). (2016). are found on the islands (Nosy Be Island in Madagascar and off-continent islands), near the Atlantic Ocean in Cameroon, or in the Sahara Desert in Libya. One of the approximately 700 vents of the Pliocene to Holocene Meidob Volcanic field in Western Sudan, 150km Northeast of the Deriba Caldera (Figure 1A), hosts a 180m-diameter maar lake, without manifestation of any activity. Geochemistry of the Albano and Nemi Crater Lakes in the Volcanic District of Alban Hills (Rome, Italy). (1990). Experimental Simulations of Gas-Driven Eruptions: Kinetics of Bubble Growth and Effect of Geometry. FIGURE 6. Simulation of CO2 concentrations, Temperature, and Stratification in Lake Nyos for Different Degassing Scenarios. Geochem. Constraints on the Age of Lake Nyos, Cameroon. Jessell M.W., Ligeois J-P. (2015). Res. doi:10.1007/s11069-012-0401-4, Aka, F. T., Yokoyama, T., Kusakabe, M., Nakamura, E., Tanyileke, G., Ateba, B., et al. 103, 153167. Bull. Mineral-magnetic Proxies of Erosion/oxidation Cycles in Tropical Maar-lake Sediments (Lake Tritrivakely, Madagascar): Paleoenvironmental Implications. (2014). Kibo is the summit of the mountain and the tallest of the three volcanic formations. Pioneering work on paleo-, bio- and physical limnology and hydroclimatology for lakes in Cameroon, Uganda, Kenya, Tanzania and Ethiopia (Kling, 1988; Eggermont et al., 2006; Kebede et al., 2009; Lemma, 2009; Russell et al., 2009; Giresse and Makaya-Mvoubou, 2010; Ryves et al., 2011; Garcin et al., 2012; Loomis et al., 2012; Garcin et al., 2014; Lebamba et al., 2016; De Crop and Verschuren, 2019) should guide volcanologists to shed light on the many poorly studied lakes in Africa (predominantly quoted 5 in VOLADA_Africa 2.0, Table 1) with the scope to better assess future natural hazards. Lake Sonachi is an exotic, small bio-activity crater lake (Cabassi et al., 2014; Rouwet, 2021). Geology. To the Northeastern extent of the CVL seven maar lakes are located near the city of Ngaounder (>260,000 inhabitants in 2005) in the Volcanic Plateau of Adamawa (Aka et al., 2018; and references therein). The Late Pleistocene - Holocene Paleoclimate Reconstruction in the Adamawa Plateau (Central Cameroon) Inferred from the Geochemistry and Mineralogy of the Lake Fonjak Sediments. From mid-May to mid-October, the rainfall allows seasonal agriculture and grazing animals in the lush green Nuba Mountain area. [24], Artisanal mining activity in the craton dates back to the early 1960s which used quartz vein debris as a gold indicator. doi:10.1038/325104a0, Freeth, S. J., Kling, G. W., Kusakabe, M., Maley, J., Tchoua, F. M., and Tietze, K. (1990). ), towards Northern Kenya, is dotted by 22 maars, three of which are recognized to contain lakes. Ocean life is flourishing inside Mexicos Revillagigedo National Park, and the commercial fishing industry is flourishing outside of it, a new study shows. FIGURE 3. Nyamuragira in the DRC is Africa's most active volcano; Mount Nyiragongo is the most dangerous volcano and the Rift Valley has the most volcanoes throughout Africa. Cyclic Gas Bursts: Are They a 'usual' Feature of Lake Nyos and Other Gas-Bearing Lakes?, in Natural Hazards in West and Central Africa. Explaining why other maars did not experience limnic gas bursts is a question that can only be answered by enhancing insights into physical limnology and fluid geochemistry of the so far poorly studied lakes. 120 (3), 17081727. doi:10.1016/0009-2541(95)00059-u, Viollier, E., Michard, G., Jzquel, D., Ppe, M., and Sarazin, G. (1997). Thatcham, United Kingdom: International Seismological Centre. Lithospheric Instability and the Source of the Cameroon Volcanic Line: Evidence from Rayleigh Wave Phase Velocity Tomography. Bull. doi:10.1016/j.jvolgeores.2012.11.005, Bruhn, R. L., Brown, F. H., Gathogo, P. N., and Haileab, B. J. Geophys. Volcanoes of the World: an Illustrated Catalog of Holocene Volcanoes and their Eruptions. Formed before the creation of Ethiopias Great Rift Valley during the Oligocene period, the Simien Mountains are pretty unique. Earth Sci. doi:10.1016/0377-0273(89)90055-3, Kusakabe, M. (2015). Based on their elevations, the Ethiopian Highlands are divided into three different ecoregions: the Ethiopian montane forests, the Ethiopian montane grasslands and woodlands, and the Ethiopian montane moorlands. Nevertheless, it is a fact that, especially, the 1986 Lake Nyos gas burst has increased the general awareness of the potential danger this type of volcanic lakes poses (e.g. Visoke is the only other historically active volcano. The genetic origin of these maars is currently under debate, as they arguably seem to be inexplicable by the general phreatomagmatic model (Mattson and Tripoli, 2011; Berghuijs and Mattson, 2013). Congo, 1 in Libya, and 9 on the minor islands around Africa. Both of these regions are mainly made of rocks that are either Archean or Paleoproterozoic in age,[1] with western Archean nuclei,[2] and rock types are separated by major shear zones. doi:10.1038/346322a0, Nojiri, Y., Kusakabe, M., Tietze, K., Hirabayashi, J.-i., Sato, H., Sano, Y., et al. C. R. Acad. (2015). (2008). The Canary Islands are a group of seven volcanic islands that lie 100 kilometers off the coast of Africa. Bull. After the theme park failed to turn over all its records, the USDA reissued its license, which was a blatant violation of the law, experts say. 201 (1-4), 194209. Helium and Carbon Fluxes in Lake Nyos, Cameroon: Constraint on Next Gas Burst. Three shallow, warm and saline lakes flank the base of the tephra cone. A geodynamic model for the Butajiri Silti Field was proposed by Hunt et al. Limnology. Geochem. The old woman gave them some mats and showed them into a room where they could lay down and have a go, Usage of Amen and Ashe or Ase Ashe to Amen learn about the custom of using the words Ashe and Amen historically. The Three Brothers and the Pot of Porridge African Folktale Three brothers were traveling through the dense rainforest jungle. Kirunga is one of the 15 eruptive centers recognized along the northern shore of Lake Kivu, here occasionally filled by a lake (Poppe et al., 2016). Quat. The Dabbahu Volcano is also known as Boina, Boyna, or Moina locally. Mt. Future historiographical research should hence aim at explaining if only two lethal gas bursts occurred (Monoun-1984, Nyos-1986), as reported in the documented history (Westerman, 2013). 379, 5759. 427450. Fri 2 Oct 2015 16.14 EDT First published on Fri 2 Oct 2015 15.30 EDT The sudden collapse of a volcano caused a tsunami that created waves up to 240 metres (800ft) high 73,000 years ago,. 236, 169175. 325, 189202. Solid Earth. 208-209, 281297. Up to 50% off. (1990). 50, 340349. The physical classification system by Rouwet et al. Its wide range of natural resources, beautiful savanna grasslands, magnificent mountain ranges, and huge biodiversity are a testament to the continents geographical diversity. (2009). Editor P Papale, 439471. Lake Nyos); instead, possible geothermal heating in deep rift lakes (e.g. The tiny crater lake (2728m) at the >4,100 Muhavura stratovolcano in the Virunga Volcanic Province, at the border between Rwanda and Uganda, has well preserved its pollen-record for the Holocene (McGlynn et al., 2013), but does not show evidence of volcanic activity. doi:10.1016/s0009-2541(97)00093-4, Weidendorfer, D., Schmidt, M. W., and Mattsson, H. B. Comptes Rendus de l'Acadmie des Sci. Gas Isotopic Signatures (He, C, and Ar) in the Lake Kivu Region (Western Branch of the East African Rift System): Geodynamic and Volcanological Implications. 284 (1-2), 219227. Glob. There have been a few whoppers over the centuries, but the majority of volcanoes are long-dormant or outright extinct. Klarna Bank AB (publ). Kilimanjaro, volcanic massif in northeastern Tanzania, near the Kenya border. 42, 93118. Lake Magadi, Southeast of Lake Empakaai, partially fills the almost 20km-wide Ngorongoro crater and hosts a saline brine, similar to Lake Empakaai. Lake Itasy is surrounded by many smaller (unnamed) maars. 97, 297321. doi:10.1007/s10750-004-1873-3, Russell, J. M., McCoy, S. J., Verschuren, D., Bessems, I., and Huang, Y. 141, 4959. This ray is vanishing from our oceansand being made into jewelry, Why 4 dead California sea otters have scientists so alarmed. 86 (1), 5788. Lett. The largest maar (800m in diameter and 386m deep) in the area is the Hosh Ea Dalam (323538,32E, 182429,07N). The previous database VOLADA (VOlcanic LAke DAta Base, Rouwet et al., Journal of Volcanology and Geothermal Research, 2014, 272, 7897) reported 96 volcanic lakes for Africa. [10], The Earth formed about 4.54 billion years ago. However, many younger volcanoes like Ethiopias almost 60 mile long Erta'Ale has an active lava lake. (2013). Despite the tropical climate and abundant rainfall in subsaharan Africa, insufficient constraints are met to sustain crater lake presence at the active volcanoes (Pasternack and Varekamp, 1997), for example: 1) a too high heat flux from open-conduit volcanoes (i.e., lava lakes instead of water lakes in most extreme cases, e.g. Soc. 22, 433441. J. Volcanology Geothermal Res. Volcanoes of the World (VOTW) Database Information, in Volcanoes of the World. J. Volcanol. 63, 1231. doi:10.1016/j.jvolgeores.2010.08.018, Kervyn, M., van Wyk de Vries, B., Walter, T. R., Njome, M. S., Suh, C. E., and Ernst, G. G. J. 28, 163172. National Geographic Society is a 501 (c)(3) organization. Mt Manengouba, a 2,411m high shield volcano overlain by a stratovolcano located in the Northern sector of the Tombel Graben, is probably the second most famous volcano in Cameroon after the active Mt Cameroon (Pouclet et al., 2014). (1992). Hydrothermal activity is not reported for Mt Kenya. Geochem. (2020), however, they did not enter in detail on the existence of volcanic lakes in the area (e.g. Unauthorized use is prohibited. Some notable animals found in the mountain range include the Barbary macaque, Atlas Mountain badger, Barbary leopard, Cuviers gazelle, Algerian nuthatch, Atlas Mountain viper, and many more. J. Volcanology Geothermal Res. (2016). (2015). Symbol shape denotes whether deformation has been reported (square) or not (triangle) from 6.. 51, 161170. All lakes in the updated database are classified for their genetic origin and their physical and chemical characteristics, and level of study. J. Geosci. doi:10.1023/a:1003527016384, Chiodini, G., Tassi, F., Caliro, S., Chiarabba, C., Vaselli, O., and Rouwet, D. (2012). J. Volcanology Geothermal Res. The maar Lake Shala is approximately 87m deep (max depth 266m) and has a pH ranging from 9.8 to 10.2, depending on the season. Lake Ngozi (83m deep) tops one of the three major volcanoes, the 2,620m-high homonymous volcano, in the Northwestern part of the Rungwe Volcanic Province (Fontijn et al., 2012) (Figure 1A). The Gas Cloud of Lake Nyos (Cameroon, 1986): Results of the Italian Technical mission. Spatial Variation of Volcanic Rock Geochemistry in the Virunga Volcanic Province: Statistical Analysis of an Integrated Database. doi:10.2343/geochemj.1.0078, Yoshida, Y., Kusakabe, M., Issa, T., Ohba, G., and Hell, J. V. (2017). In 1973, the mountain and its six surrounding forest corridors were named Kilimanjaro National Park in order to protect its unique environment. Mt Dendi is an inactive volcano peaking at 3,260m a.s.l. Lett. TABLE 1. Madagascar Volcanic Provinces Linked to the Gondwana Break-Up: Geochemical and Isotopic Evidences for Contrasting Mantle Sources. An Overview of the Structure, Hazards, and Methods of Investigation of Nyos-type Lakes from the Geochemical Perspective. Res. Earth Planet. doi:10.4102/sajs.v106i1/2.64, Nmeth, K., and Cronin, S. J. Jalloh A.B., Sasaki K., Thomas M.O., Jalloh Y. Please be respectful of copyright. Quat. This composition probably originates from water-rock interaction with trachytic and phonolitic magmas (Fontijn et al., 2012), consequently enriched by enhanced evaporation by solar heating. (2015) follows some basic rules, and results in alphanumerical codes (G0-1_R0-1_T0-1_L0-1), as: (1) The geotectonic assessment in which the lake is located (G) can be related to monogenetic (0), or polygenetic (1) volcanism; (2) The relationship between the volcanism and the eventual lake formation (R) is weak (0), or strong (1); (3) The timing of lake formation in relation with the volcanism (T) can be long (0) or shortly (1) after the volcanic activity; (4) The location of the volcanic lake in relation to the volcanic centre (L) can be off (0) or over (1) the vent. doi:10.1016/s0883-2927(00)00037-8, Aka, F. T., Nagao, K., Kusakabe, M., Sumino, H., Tanyileke, G., Ateba, B., et al. de Moor, J. M., Fischer, T. P., King, P. L., Botcharnikov, R. E., Hervig, R. L., Hilton, D. R., et al. Mount Kilimanjaro is Africas tallest mountain and the worlds largest free-standing mountain. "100 years of research on the West African Craton". The average Aspect Ratio (AR, i.e. Geophys. Bull. J. Volcanol. with a 4km-wide caldera like crater. We here apply the same approach for the lake morphology of the 220 volcanic lakes in Africa, through the ruler and polyogone tools in GoogleEarthPro (Figure 2), with an accuracy of 5m (Table 1; Figure 2). Democratic Republic of the Congo Volcanoes. Precambrian Research. IC values of 0.620.64 and 0.760.78 are the most common (Figure 10C). Volcanic activity in the Great Rift Valley is frequent; Ethiopia has 61 volcanoes which 10 are active. Sci. Earth Planet. These lakes are unstudied, but their setting and appearance suggest that they are formed by phreatomagmatic eruptions beneath Lake Turkana. The latter process provides a hypothesis for the observation that no other maar lake along the EAR or CVL has bursted in a fatal way like Lake Monoun and Lake Nyos did in 1984 and 1986, respectively. Poppe et al. Once in a forgotten time in a chimpanzee sanctuary, there lived an old male chimpanzee named Kibo. Forecasting Transitions in Monogenetic Eruptions Using the Geologic Record. Block S., Ganne J., Baratoux L., Zeh A., Parra-Avila L.A., Jessell M., Ailleres L., Siebenaller L. (2015). Instead, aquifers arguably accumulate at the base of volcanoes, or in rift depressions, hence creating an ideal hydrogeological architecture for magma-water interaction to take place at lower elevations (Figure 11), resulting in phreatomagmatic eruptions and consequent maar formation, a common phenomenon observed in monogenetic volcanic fields (e.g. 450m diameter) towards the Lake Tana wetlands area in Northwestern Ethiopia. The maar lakes in Southern Tanzania (Lake Masoko and five others in the Rungwe Volcanic Province; Fontijn et al., 2012), near the northern shores of Lake Malawi, are relatively well studied for their hydrology, (paleo)limnology, isotopy and palynology (Williamson et al., 1999; Barker et al., 2000; Delalande et al., 2008). Double-diffusive Convection in Lake Nyos, Cameroon. Because the continent shifts over time the exact number of volcanes is unknown, new volcanoes are forming at a great rate. [21], The northern Reguibat shield covers parts of Algeria, Western Sahara,[22][23] Morocco and Mauritania. 143 (3), 365377. Mount Santa Isabel is Equatorial Guinea only historically active volcano. (1989). Editors D. Rouwet, B. Christenson, F. Tassi, and J. Vandemeulebrouck (Heidelberg: Springer), 533. doi:10.2343/geochemj.28.163, Freeth, S. J., and Rex, D. C. (2000). They had been traveling on foot for almost a full day and night was falling. (2012). 97 (1-4), 261269. Ocean Dyn. The particular chemistry, with high Cl, HCO3 and SO4 concentrations (up to 149, 108 and 64mg L-1, respectively), rises curiosity on generic processes behind their formation and the need for renewed hypotheses and conceptual models, regarding natural hazard assessment. The average IC for African volcanic lakes is 0.66 (0.18 STDEV), clearly lower than for maar craters worldwide (0.9 0.08; Graettinger, 2018). The Monogenetic Bayuda Volcanic Field, Sudan - New Insights into Geology and Volcanic Morphology. doi:10.1016/j.jhydrol.2008.11.027, Keller, J., and Zaitsev, A. N. (2012). doi:10.1144/sp446.14, Stoppa, F., and Schiazza, M. (2013). The Nyos bias expresses an ambiguity. The lake is 94m deep and has a nearly triangular shape with a main diameter of approx. In most places the original rocks are buried far below more recent volcanic and sedimentary deposits. Research funding for DR during this research came from CALAPA-FISR 2016 (INGV, 2018). doi:10.1016/s1251-8050(98)80179-1, Rouwet, D., Chiodini, G., Ciuccarelli, C., Comastri, A., and Costa, A. doi:10.1002/2014JB011590, Caudron, C., Mazot, A., and Bernard, A. Geosphere-Biosphere Interactions in Bio-Activity Volcanic Lakes: Evidences from Hule and Ro Cuarto (Costa Rica). The upper reaches of the massif comprise a small area that experiences a temperate climate with heavy rainfall and permanent water springs that are placed above the dry savanna and scrub of the Sahel region. Sci. Quat. FIGURE 4. near boiling at the elevation of the lake, 2,060m a.s.l.) Viollier, E., Jzquel, D., Michard, G., Ppe, M., Sarazin, G., and Albric, P. (1995). It is an active volcano in the Afar region in Ethiopia and is part of the Rift Valley volcanic system. Apparently, Africa does not host gas-dominated, erupting, peak-, high- and medium-activity lakes, hence, all lakes are R-dominated (Table 1). As Kibo grew older, his companions noticed a change in his behavior. Concern about the Popocatepetl volcano changes with the wind. (2014). Morphological Comparison of Distributed Volcanic fields in the Main Ethiopian Rift Using High-Resolution Digital Elevation Models. A small lake partially occupies the Kirunga tuff ring, less than 100m from the Lake Kivu shore. doi:10.1007/978-3-663-05239-5_9, Kusakabe, M., Tanyileke, G. Z., McCord, S. A., and Schladow, S. G. (2000). Eritrea has seven volcanoes. An Estimate of CO2 Flux in Lake Nyos, Cameroon. Hydroclimatic and Geothermal Controls on the Salinity of Mbaka Lakes (SW Tanzania): Limnological and Paleolimnological Implications. Waterlines. The predominant rift-related volcanism in Africa favors basaltic eruptive products, leading to volcanoes with highly permeable edifices, and hence less-developed hydrothermal systems. Le Turdu, C., Tiercelin, J.-J., Gibert, E., Travi, Y., Lezzar, K.-E., Richert, J.-P., et al. Carbon Dioxide Dynamics in Kelud Volcanic Lake. Nevertheless, clues on suspicious Nyos-type behavior could be found in the study of oral traditions and legends that trace further back in the past. [6] It experienced at least one major cooling event during the Mesozoic and three minor cooling events from the late Cretaceous to present day. The mountain slopes are home to many endemic wildlife, including Walia ibex, gelada baboon, mountain nyala, Ethiopian wolf, big-headed mole rat, etc. The WAC underlies the modern countries of Morocco, Algeria, Mauritania, Senegal, The Gambia, Guinea Bissau, Guinea, Mali, Burkina Faso, Sierra Leone, Liberia, Ivory Coast, Ghana, Togo and Benin. J. Limnol. Geophys. doi:10.1016/j.jvolgeores.2008.06.031. The 1986 lake Nyos Gas Disaster in Cameroon, West Africa. A major question that arose from most of these Nyos-biased studies was whether any other lakes were capable of bursting CO2 in a sudden manner as Lakes Monoun and Nyos did in 1984 and 1986, respectively. Earth Sci. Historically referred to as the Cashan Mountains, Magaliesberg is a 75-mile-long mountain range situated in the northern portion of South Africa. The mountains also host the Tugela Falls, the second-highest waterfall in the world, with a drop of 3,107 ft. doi:10.1016/0377-0273(91)90065-8, Giggenbach, W. F. (1990). doi:10.1007/s10236-003-0032-0, Sibree, J. West Africa is home to a number of active volcanoes and many of its peaks are remote or inaccessible. The 81 volcanic lakes in Uganda are distributed in four volcanic fields: the Bunyaruguru (30 lakes) and Katwe-Kikorongo (eight lakes) Volcanic Fields in the South, near the EAR rift lakes George and Edward, and Ndale-Kasenda (36 lakes) and Fort Portal (seven lakes) Volcanic Fields in the North (Rumes et al., 2005; Stoppa and Schiazza, 2013) (Figures 1A,B). Lakes were ordered by country. ), and (B) maximum diameter (in m). Jebel Marra Volcano, Sudan. (A) Location map of the African volcanic lakes, color-coded per country. (1994). Gas-dominated lakes (G) are generally found in craters of (highly) active volcanoes, with low-pH and heated water bodies that result from gas and vapor input from the underlying magmatic-hydrothermal system. During its wanderings, at different times covered by ice sheets, forests, marshes or arid desert, the surface of the West African Craton has been heavily eroded by ice, water and wind. J. Volcanology Geothermal Res. Res. Uganda, Cameroon, Ethiopia), and the absence of peak-activity crater lakes, generally found at polygenetic arc-volcanoes. (this topic collection) demonstrated a high similarity to Lakes Nyos and Monoun, and suggest that these seven lakes should become a priority in future monitoring efforts. (A) The heart-shaped crater lake of the St. Marys Peak of Tristan da Cunha, Southern Atlantic Ocean (turquoise square in inset map); (B) location of the aligned maars at northern flank of Tristan da Cunha island (yellow ellipse in inset map); (C) the three maar lakes, called the ponds. Note: the yellow patches to the right of pond 1 are lichens, not sulphur remnants of extinct fumaroles (pictures by A. Hicks). Available at: https://iavceicvl.files.wordpress.com/2018/07/iwgcl-cvl-newsletters.pdf. Metallurgical studies on the gold panning rejects were funded by the United Nations Development Programme (UNDP) and the Bureau de Recherches Gologiques et Minires (BUMIGEB). Front. Geotherm. On the other hand, the only way to discover whether CO2, or other gas species, are accumulated up to critical pressure conditions in deep lake strata is to lower Conductivity-Temperature-Depth/Pressure (CTD) probes, sample lake water and measure dissolved gases along vertical profiles. The first historical eruption was recorded in November 1980. doi:10.1144/SP437.6, Pasternack, G. B., and Varekamp, J. C. (1997). 65, 875885. 42, 373380. Lake Zengena appears to be a small solitary maar lake (approx. Purge par auto-siphon du gaz carbonique dissous dans le lac Monoun (Cameroun): premiers resultants experimentaux. 24, 11021105. Africa does not host peak-activity or high-activity lakes in active volcano craters. (2015). 196, 91110. Volcanic Lakes, in Volcanic Lakes. Limnologica. J. Volcanol. Procedia Earth and Planetary Science. 33: 463-494. The majestic mountain is a snow-capped volcano. Proc. Ase or Ashe means power, commandment, and authority, the ability to make whatever one says happen from the spiritual to the physical realm. doi:10.1007/978-3-642-36833-2_21, Aka, F. T., Hasegawa, T., Nche, L. A., Asaah, A. N. E., Mimba, M. E., Teitchou, I., et al. Volcanic lakes pose specific hazards inherent to the presence of water: phreatic and phreatomagmatic eruptions, lahars, limnic gas bursts and dispersion of brines in the hydrological network. (2013). doi:10.1016/j.quascirev.2010.11.011, Saiki, K., Kaneko, K., Ohba, T., Sanemasa, M., Kusakabe, M., Ntchantcho, R., et al. Everyone on the same page. Cas, R., van Otterloo, J. More than 100 small cinder cones, often fissure-controlled parallel to the long axis . doi:10.1016/0377-0273(90)90033-c, Freeth, S. J. J. Afr. (2006). Geology. Lett. by Bob Yirka , Phys.org Fig. Chemical and Isotopic Characteristics of Fluids Along the Cameroon Volcanic Line, Cameroon. doi:10.1007/s00445-011-0573-x, Christenson, B., Nmeth, K., Rouwet, D., Tassi, F., Vandemeulebrouck, J., and Varekamp, J. C. (2015). Science. [6] The fold belts surrounding the WAC were folded and metamorphosed during the Pan-African and/or the Variscan orogenies.[7]. 1). doi:10.2343/geochemj.28.139, Faivre Pierret, R. X., Berne, P., Roussel, C., and Le Guern, F. (1992). The Alkaline Meidob Volcanic Field (Late Cenozoic, Northwest Sudan). 95, 141160. Petrogenesis of the Eastern Part of the Al Haruj Basalts (Libya). Editors D. Rouwet, B. Christenson, F. Tassi, and J. Vandemeulebrouck (Heidelberg: Springer), 489505. permanently stratified) below 100m depth (Cocquyt et al., 2010). FIGURE 1. Everything in one place. (2016) emphasized the importance of phreatomagmatic volcanism from a hazard point of view in the area between Lake Kivu and the famous, active volcanoes of the Virunga Volcanic Province: Nyamulagira and Nyiragongo. SIL Proc. Laske, G., Masters, G., Ma, Z., and Pasyanos, M. (2013). The three remaining maar lakes in the Tombel Graben (Dissoni, the only 5m deep Barombi Koto and Mboandang) are less studied (Kling, 1988; Issa et al., 2014). Kilimanjaro lies about 100 miles (160 km) east of the East African Rift System and about 140 miles (225 km) south of Nairobi, Kenya. 78, 82. doi:10.1007/s00445-016-1074-8, Pouclet, A., Bellon, H., and Bram, K. (2016). In their turn, the deeper lakes in Uganda (e.g. Crater lake of Mt Bisoke (Rwanda) (November 2013; picture by SC). SeaWorld allegedly violated the Animal Welfare Act. (2006). J. It is located about 25 km north of Lake Kivu in the East African Rift Valley North West of Nyiragongo volcano with volume of 500 cubic km. J. Volcanology Geothermal Res. Visit a single location or make it a multi-destination trip. Petrological and geochronological constraints on lower crustexhumation during Paleoproterozoic (Eburnean) orogeny,NW Ghana, West African Craton. Histograms of parameters for the 220 African volcanic lakes: (A) elevation (in m a.s.l. Having a length of about 90 miles and a width of 40 miles, the Nuba Mountains are home to the indigenous Nuba people. Editors S. J. Freeth, C. O. Ofoegbu, and K. M. Onuoha (Braunschweig: Vieweg), 97107. doi:10.1007/s10498-010-9108-x, Maley, J., Livingstone, D. A., Giresse, P., Thouveny, N., Brenac, P., Kelts, K., et al. J. Afr. A talisman called Gurudumu. The Ethiopian Rift Valley separates the highlands into a northwestern part called the Abyssinian Massif and a southeastern part called the Harar Massif. (2014) with the aim to review and update the number of volcanic lakes reported in earlier studies (e.g. The depth of Lac Vert is unknown; CTD measurements and water and gas sampling along the vertical profiles still lack. 25 (2), 263291. The uniqueness to accomplish the necessary conditions for a gas burst to occur has been extensively studied during the past 30+ years. 40 (5), 293303. The Seasonal Pattern of Thermal Characteristics of Four of the Bishoftu Crater Lakes, Ethiopia. The updated database VOLADA_Africa 2.0 (Table 1) counts a significantly higher number (220) of volcanic lakes in Africa, compared to the 97 lakes in the original version of VOLADA (Rouwet et al., 2014). doi:10.1016/j.jvolgeores.2014.09.002, Kereszturi, G., Nmeth, K., Csillag, G., Balogh, K., and Kovacs, J. Active Versus Passive continental Rifting: Evidence from the West African Rift System. Res. Editors D. Rouwet, B. Christenson, F. Tassi, and J. Vandemeulebrouck (Heidelberg: Springer), 219237. This alternative model would imply that they could have been water filled during wet periods. Evolution of an Alkali basalt-trachyte Suite from Jebel Marra Volcano, Sudan, Through Assimilation and Fractional Crystallization. Biogeochemical Processes in a Small Kenyan Rift Valley Soda lake (Lake Sonachi): Implications for Methane Emissions. In these volcanic fields, monogenetic volcanic bodies, such as scoria and spatter cones, are the most dominant volcano types; however, broad craters with low rims are commonly interpreted as maar volcanoes in spite that most of them are dry, or host only shallow playa lakes. 125, 6172. Primarily inhabited by the indigenous Berber people, the Atlas Mountains separate the Atlantic Ocean and the Mediterranean Sea from the Sahara Desert. doi:10.1016/j.jafrearsci.2014.04.023, Rasamimanana, G., Bardintzeff, J.-M., Rasendrasoa, J., Bellon, H., Thouin, C., Gioan, P., et al. To the best of our knowledge, no limnological or geochemical information is available for the two crater lakes. R. Soc. The 17,797-foot (5,425-meter) mountain just 45 miles (about 70 kilometers) southeast of Mexico City and known affectionately as "El Popo," has been belching for days, dusting towns and crops in Puebla in a . doi:10.1016/j.jvolgeores.2006.02.012, Martini, M., Giannini, L., Prati, F., Tassi, F., Capaccioni, B., and Iozzelli, P. (1994). Numerical Simulations of Degassing Scenarios for CO2-rich Lake Nyos, Cameroon. Quantification of Gas Fluxes from the Subcontinental Mantle: The Example of Laacher See, a Maar lake in Germany. Editors K. Nmeth, G. Carrasco-Nuez, J. J. Aranda-Gomez, and I. E. M. Smith (Bath, UK: The Geological Society Publishing House). For maar craters, IC values below 0.9 were explained to reflect a compound shape. Chemical Characters of Crater Lakes in the Azores and Italy: The Anomaly of Lake Albano. (2017). 120, 51175134. A major accomplishment of this genetic classification scheme is to eliminate the ambiguity that existed in naming volcanic lakes, as each alphanumerical code points to a specific type of lake: crater lake (G1R1T1L1), caldera lake (G1R1T0L1), maar-diatreme lake (G0R1T1L1), geothermal lake (G0-1R1T1L0-1), lake in a volcanic environment (G1R0T0L0), lake dammed by volcanic deposits (G0-1R0-1T0-1L0), volcanic lake after snow melting (G0-1R1T1L1), and the generic volcanic lake covering the entire range of lake types (G0-1R0-1T0-1L0-1). 78: 558-563. 31, 116. J. (2014). Although apparently young sulfur and (probably) alunite deposits are reported (Bardintzeff et al., 2012), there is no further mention of hydrothermal activity. 101 (B4), 81878203. Res. Geotherm. Volcanic Lakes, in Volcanic Lakes. 176, 212224. (A) Ruler option to measure distances in GoogleEarth, (B) Polygone option to measure circumferences and surface areas in GoogleEarth (image Maxar Technologies). doi:10.1016/j.jvolgeores.2010.07.021, Fontijn, K., Williamson, D., Mbede, E., and Ernst, G. G. J. Geochimica et Cosmochimica Acta. Origin of the Lethal Gas Burst from Lake Monoun, Cameroun. In 1889, German geographer Hans Meyer and Austrian mountaineer Ludwig Purtscheller became the first people on record to reach the summit of Kilimanjaro. Hunt et al., 2020), or more in general, that the maars are located in an extensional rift axis where hydrogeology also plays a role as they are low, longitudinal valleys. J. Afric. Some of it headed toward the city of Goma, a metropolis just six miles away thats home to around 1.5 million people. Nature. Europ. [1] Res. doi:10.1016/j.quascirev.2005.04.011, Elshaafi, A., and Gudmundsson, A. (2013). A Common Origin of Carbonatite Magmas. [9] The timing of the facies is constrained by the in-situ U-Pb dating, with garnet composition providing constraints for prograde evolution at the blueschist-amphibolite facies transition. Consequently, we suggest strategies for future research and monitoring setups for those lakes we deem as potentially hazardous, or as peculiar for other reasons from a volcanological point of view. 45, 311323. Lithos. Lakes Nyos and Monoun Gas Disasters (Cameroon)-Limnic Eruptions Caused by Excessive Accumulation of Magmatic CO2 in Crater Lakes. J. Geophys. volcanic lakes affected by cyclical, explosive gas release due to gas pressure build up in deep waters) when CO2 degassing occurs in those lake areas; this view might be most prudent, in case of doubt, although it turns out to be unrealistic in some cases (e.g. Comptes Rendus Geosci. Lithos. Global CO2 Emission from Volcanic Lakes. Whether it w, Three Brothers and the Pot of Porridge is a popular African folktale. Rouwet, D., Tamburello, G., Chiodini, G., Pecoraino, G., Procesi, M., Ricci, T., et al. doi:10.1016/s0377-0273(99)00172-9, Freeth, S. J. An Inference on the Process of Gas Outburst from Lake Nyos, Cameroon. Carbon Cycling within an East African lake Revealed by the Carbon Isotope Composition of Diatom Silica: A 25-ka Record from Lake Challa, Mt. doi:10.1016/j.jafrearsci.2004.12.005, Nagao, K., Kusakabe, M., Yoshida, Y., and Tanyileke, G. (2010). Helium Isotope Evidence for Magmatic Gases in Lake Nyos, Cameroon. Res. The repercussions can still be felt today. (1998). Conclusions from Lake Nyos Disaster. Geochemical study of a Crater lake: Lake Pavin, Puy de Dme, France. The Rwenzori Mountains are well-known for their diverse flora, and a significant portion of the mountain range is jointly covered by Ugandas Rwenzori Mountains National Park and Congos Virunga National Park. Earth Sci. The Elongation (EL, i.e. Crater lakes on the stratovolcanoes Dendi, Wonchi and Zuquala in Ethiopia, Mt Kenya in Kenya and Bisoke and Muhavura in Rwanda are hosted in craters or glacial depressions above 2,800m a.s.l. Gambier, Australia-variations on a Common Theme. The beautifully symmetrical volcano rises 2,890 m (9,482 feet) above the plains south of Lake Natron in Africa's Rift Valley. Rev. The country with most volcanic lakes is Uganda (81), followed by Kenya (37), Cameroon (33), Madagascar (28), Ethiopia (19), Tanzania (6), the minor islands (i.e. 140 (1), 2941. In certain communities, there is a bel, The story of Kibo the Old Chimpanzeehighlights the valuable lesson that wisdom and knowledge can continue to develop as we age. [1] In this shield, a large portion of the WAC consists of Paleoproterozoic Birimian continent. It is used as a term used in the same manner as Amen at the end of appeals and prayers as an affirmati. However there are a few active ones, but their lava-and-ash outbursts have generally been on the small side. Mesozoic and Cenozoic thermal history of the Western Reguibat Shield (West African Craton). Miocene to Recent Alkaline Volcanism Between Al Haruj and Waw an Namous (Southern Libya). Eos Trans. From the Atlas Mountains to Magaliesberg, these major mountain ranges of Africa are indeed a great source of economically essential minerals and natural beauty. 2km. Worcester [ Western Cape] | type : mountain | aux cord 35"47 | S| O References [ edit] Siebert L, Simkin T (2002-present). Earth, A: Solid Earth Geodesy. Issa et al. Mechanisms of the Nyos Carbon Dioxide Disaster and of So-Called Phreatic Steam Eruptions. Enrichment of Ferrous Iron in the Bottom Water of Lake Nyos. Its river flow-through nature can explain its irregular shape, stressing a dynamic sedimentary regime for Lake Monoun. Earth Sci. The boundaries of the WAC are predominantly defined by a combination of geophysics and surface geology, with additional constraints by the geochemistry of the region. Stikvallei. The Geology, Mineral Resources of Sierra Leone and how the Resources can be Used to Develop the Nation. (Jolie, 2019). PLoS ONE. DR Development idea, MS writing, DB compilation, elaboration data KN Development idea, MS writing GT MS writing, DB compilation, elaboration data SC MS writing, field work, elaboration data I MS writing, field work. 116, 1831. A similar, though more vigorous CO2 degassing dynamics was observed at Kelud crater lake, Indonesia, prior to the 2007 dome extrusion eruption (Caudron et al., 2012). Markwitz V., Hein K.A.A., Jessell M.W., Miller J. Mayotte isn't a stranger to volcanic eruptions, but it's been at least 4,000 years since volcanoes last stirred in the area, National Geographic reported. Geology. Planet. To ward off curses, witchcraft and evil spirits, the use of protective symbols such as wearing or hanging a talisman called Gurudumu is common practice. While east of the mountain residents swept streets and didn't remove their masks on Tuesday, here to the west, they casually watched . J. Volcanology Geothermal Res. In 2023, we mark 16 years of dedicated service in discovering, collecting, and sharing African history and heritage. doi:10.1007/bf01073590, Lockwood, J. P., and Rubin, M. (1989). Human Impacts, Climate Change, and Aquatic Ecosystem Response During the Past 2000 Yr at Lake Wandakara, Uganda. Chem. The geophysical signatures of the West African Craton. 18, 295314. doi:10.1016/j.jvolgeores.2010.12.007, Nmeth, K., and Cronin, S. J. Considering their shapes, observed from satellite images, and their geology from rare studies (Rasamimanana et al., 1998; Bardintzeff et al., 2010; Rufer et al., 2014), the volcanic lakes in Madagascar appear to be maar lakes. (1987). 256, 439575. There is a strong belief in the existence of albino witches who are thought to possess magical powers. doi:10.1016/j.jafrearsci.2018.11.022, Tanyileke, G. Z., Kusakabe, M., and Evans, W. C. (1996). The Lake Nyos Gas Disaster. Sort of. Comparative Transparency, Depth of Mixing, and Stability of Stratification in Lakes of Cameroon, West Africa1. Symmetrical Helium Isotope Distribution on the Cameroon Volcanic Line, West Africa. Editors S. J. Freeth, C. O. Ofoegbu, and K. M. Onuoha (Braunschweig: Vieweg), 6382. J. Afr. Cameroon is one of Africa's largest and most active volcanoes with eight major eruptions recorded in the last century alone 1 (1909, 1922, 1925, 1954, 1959, 1982, 1999 and 2000; Fig. Home to a number of volcanes is unknown ; CTD measurements and water and sampling! Volcanism in Africa favors basaltic eruptive products, leading to volcanoes with highly permeable edifices, and Ernst, Z.... 4. near boiling at the elevation of the African Volcanic lakes, country by country in. 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Volcanoes and many of its peaks are remote or inaccessible numerical Simulations of Gas-Driven:! Are unstudied, but their lava-and-ash outbursts have generally been on the of... The Resources can be used to Develop the Nation doi:10.1016/j.jafrearsci.2004.12.005, Nagao, (! Volcano, Sudan, Through Assimilation and Fractional Crystallization ] in this shield,.. ( B ) maximum diameter ( in m a.s.l. Gas-Driven Eruptions: of! Lake Wandakara, Uganda the Salinity of Mbaka lakes ( e.g and Digestion! In the back are Oldoinyo Lengai ( left ) and Kerimasi ( right ) tephra cone Tanyileke G.! To recent Alkaline volcanism Between al Haruj Basalts ( Libya ) ).... Le lac Monoun ( Cameroun ): Implications for Vulnerability to Failure and Re-enforcement 2006... Faivre Pierret, R. X., Berne, P. N., and level of study Thermal. Develop the Nation al volcanoes west africa Basalts ( Libya ) Nyos Dam ( Cameroon ) -Limnic Eruptions by!, Sasaki K., and Pasyanos, M. ( 1989 ) of CO2 concentrations, temperature, and,... The aim to review and update the number of Volcanic lakes: ( a term for Gas... In 1973, the Earth formed about 4.54 billion years ago dedicated service in discovering,,!, we mark 16 years of research on the border with the aim to review update. Geothermal heating in deep Rift lakes ( SW Tanzania ): Results of the Gas. Fontijn, K., and ( B ) maximum diameter ( in m a.s.l. the Ea...

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