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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Origin of the lethal gas burst from Lake Monoun, Cameroun
Journal of Volcanology and Geothermal Research, Volume 31, No. 1-2, Year 1987
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Description
On 15 August, 1984, a lethal gas burst issued from a submerged 96-m-deep crater in Lake Monoun in Cameroun, western Africa, killing 37 people. The event was associated with a landslide from the eastern crater rim, which slumped into deep water. Waters below 50 m are anoxic, dominated by high Fe2+ (∼600 mg/l) and HCO3- (≥ 1900 mg/l), anoxic and supersaturated with siderite, which is a major component of the crater floor sediments. The unusually high Fe2+ levels are attributed to reduction of laterite-derived ferric iron gradually brought into the lake as loess and in river input. Sulfur compounds are below detection limits in both water and gas. Gases effervescing from depressurized deep waters are dominantly CO2 with minor CH4, having δ13C of -7.18 and -54.8 per mil, respectively. Bacterial decomposition of organic matter may account for the methane, but 14C of lake water indicates that only 10% of the carbon is modern, giving an apparent age of 18,000 years. The dominant source of carbon is therefore attributed to long-term emission of CO2 as volcanic exhalation from vents within the crater, which led to gradual build-up of HCO3- in the lake. The density stratification of the lake may have been upset by an earthquake and underwater landslide on 15 August, which triggered overturn of the lake and caused nucleation of CO2 in the deep water. The resultant ebullition of CO2 from deep lake waters led to a gas burst at the surface and locally generated a water wave up to 5 m high. People travelling through the gas cloud were asphyxiated, presumably from CO2, and suffered skin discoloration from unidentified components. © 1987.
Authors & Co-Authors
Sigurdsson, H.
United States, Narragansett
University of Rhode Island Narragansett Bay Campus
Devine, J. D.
United States, Narragansett
University of Rhode Island Narragansett Bay Campus
Tchua, F. M.
Cameroon, Yaounde
Université de Yaoundé I
Presser, F. M.
United States, Menlo Park
United States Geological Survey Western Region
Pringle, M. K.W.
United States, Menlo Park
United States Geological Survey Western Region
Evans, William C.
United States, Menlo Park
United States Geological Survey Western Region
Statistics
Citations: 296
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1016/0377-0273(87)90002-3
ISSN:
03770273
Research Areas
Environmental