Origin and age of the Lake Nyos Maar, Cameroon

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doi: 10.1016/0377-0273(89)90052-8
Authors:Lockwood, John P.; Rubin, Meyer
Author Affiliations:Primary:
U. S. Geol. Surv., United States
Other:
Univ. Iceland, Iceland
Volume Title:Lake Nyos event and natural CO<sub>2</sub> degassing; I
Volume Authors:Le Guern, François, editor; Sigvaldason, Gudmundur E.
Source:The Lake Nyos event and natural CO<2` degassing; I, edited by François Le Guern and Gudmundur E. Sigvaldason. Journal of Volcanology and Geothermal Research, 39(2-3), p.117-124. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-0273
Publication Date:1989
Note:In English. 25 refs.; illus. incl. sect., geol. sketch map
Summary:Lake Nyos occupies a young maar crater in the Precambrian granitic terrain of NW Cameroon. The lake is partly surrounded by poorly consolidated, ultramafic nodule-bearing pyroclastic surge deposits that were explosively ejected from Nyos crater at the time of its formation. Radiocarbon dating shows that the maar probably formed approx 400 yr ago. It seems that CO2 could have been the principal volatile involved in the formation of the Nyos maar, and that the role of H2O may have been minor. CO2 may still be trapped in a diatreme inferred to underlie Lake Nyos; its gradual release into the waters may have set the stage for the event of 21 August 1986. Only young maar lakes such as Nyos may pose a danger of future lethal gas releases. [R.E.S.]
Subjects:Basalts; Carbon dioxide; Cinder cones; Gases; Geomorphology; Igneous rocks; Maars; Volcanic features; Volcanic rocks; Volcanism; Volcanology; Africa; Cameroon; Lake Nyos; West Africa; Northwestern Cameroon
Abstract Numbers:90M/3503
Record ID:1990016889
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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