de.pangaea.dataset874334 und dataset PANGAEA

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https://www.pangaea.de/ information pointOfContact 2026-07-15T19:34:35Z https://doi.pangaea.de/10.1594/PANGAEA.874334 2017-04-06T12:03:10 publication https://doi.org/10.1594/PANGAEA.874334 Asaah, Asobo N E

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https://orcid.org/0000-0003-4940-6629 information author Yokoyama, Tetsuya https://orcid.org/0000-0003-2247-7232 information author Aka, Festus T author Usui, Tomohiro author Kuritani, Takeshi author Wirmvem, Mengnjo J author Iwamori, Hikaru author Fozing, Eric M author Tamen, Jules https://orcid.org/0000-0002-4302-5035 information author Mofor, Gilbert Z author Ohba, Takeshi author Tanyileke, Gregory author Hell, Joseph Victor author PANGAEA

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https://www.pangaea.de/ information publisher tableDigital Lake Nyos is located at the summit of a stratovolcano in the Oku Volcanic Group (OVG) along the Cameroon Volcanic Line. The sudden release of magmatic CO2 trapped at the bottom of Lake Nyos in August 1986 caused historical casualties of 1750 people and over 3000 cattle. New geochemical data of volcanic rocks from the Nyos volcano and the first available data for volcanic rocks from other maar-bearing volcanoes (Lakes Elum, Wum and Oku) in the OVG are presented and compared. Lavas from the Nyos, Elum and Wum volcanoes show similarities in major and trace elements and Sr?Nd?Pb isotopes, suggestive of a similar mantle source. However, this source is slightly different from that of the Oku volcano. The samples from Lake Oku have lower alkali, higher TiO2 and more depletion and enrichment in most incompatible trace elements than those from the Nyos, Elum and Wum volcanoes. These differences and those observed in the Sr?Nd?Pb results are consistent with a heterogeneous source for lavas in the OVG. Trace element compositions suggested the presence of garnet in the source (< 6% garnet) and modelled melting results indicate < 2% partial melting of the source material. Isotope data plot within the focal zone, extending towards enriched mantle 1 (EM1; e.g. Lakes Oku and Nyos samples). This indicates the involvement of at least three mantle components: depleted mid-ocean ridge basalt mantle, high-µ and EM1 components in the magmatism of the lavas studied. The contributions of these components in different proportions, originating from asthenospheric and subcontinental lithospheric mantle sources, can account for the observed variations in geochemical characteristics. The geochemical characteristics of the studied lavas indicate that the magma source need not necessarily have an abnormal CO2 concentration to pose a potential threat. Degassing of an ordinary magma chamber and the migration of gas to the bottom of the lakes through cracks and faults can lead to the accumulation of CO2 in lake bottoms. This is controlled by tectonic parameters (fractures and faults) that enhance degassing from the magma chamber to the lake bottom and physical parameters of the lake (e.g. size, depth, temperature and solubility) that control CO2 stability. completed Asaah, Asobo N E

asoboasaah@gmail.com

https://orcid.org/0000-0003-4940-6629 information principalInvestigator copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation 10.2069 10.453889 6.192778 6.44505 Event label thematicClassification Latitude of event thematicClassification Longitude of event thematicClassification Sample ID thematicClassification Silicon dioxide physicalMeasurement % % Titanium dioxide physicalMeasurement % % Aluminium oxide physicalMeasurement % % Iron oxide, Fe2O3 physicalMeasurement % % Manganese oxide physicalMeasurement % % Magnesium oxide physicalMeasurement % % Calcium oxide physicalMeasurement % % Sodium oxide physicalMeasurement % % Potassium oxide physicalMeasurement % % Phosphorus pentoxide physicalMeasurement % % Loss on ignition physicalMeasurement % % Total physicalMeasurement % % Magnesium physicalMeasurement % % Chromium physicalMeasurement mg/kg mg/kg Nickel physicalMeasurement mg/kg mg/kg Cobalt physicalMeasurement mg/kg mg/kg Vanadium physicalMeasurement mg/kg mg/kg Zinc physicalMeasurement mg/kg mg/kg Copper physicalMeasurement mg/kg mg/kg Rubidium physicalMeasurement mg/kg mg/kg Strontium physicalMeasurement mg/kg mg/kg Yttrium physicalMeasurement mg/kg mg/kg Zirconium physicalMeasurement mg/kg mg/kg Niobium physicalMeasurement mg/kg mg/kg Caesium physicalMeasurement mg/kg mg/kg Barium physicalMeasurement mg/kg mg/kg Lanthanum physicalMeasurement mg/kg mg/kg Cerium physicalMeasurement mg/kg mg/kg Praseodymium physicalMeasurement mg/kg mg/kg Neodymium physicalMeasurement mg/kg mg/kg Samarium physicalMeasurement mg/kg mg/kg Europium physicalMeasurement mg/kg mg/kg Gadolinium physicalMeasurement mg/kg mg/kg Terbium physicalMeasurement mg/kg mg/kg Dysprosium physicalMeasurement mg/kg mg/kg Holmium physicalMeasurement mg/kg mg/kg Erbium physicalMeasurement mg/kg mg/kg Thulium physicalMeasurement mg/kg mg/kg Ytterbium physicalMeasurement mg/kg mg/kg Lutetium physicalMeasurement mg/kg mg/kg Hafnium physicalMeasurement mg/kg mg/kg Tantalum physicalMeasurement mg/kg mg/kg Lead physicalMeasurement mg/kg mg/kg Thorium physicalMeasurement mg/kg mg/kg Uranium physicalMeasurement mg/kg mg/kg Europium physicalMeasurement mg/kg mg/kg Strontium-87/Strontium-86 ratio thematicClassification Neodymium-143/Neodymium-144 ratio thematicClassification Lead-206/Lead-204 ratio thematicClassification Lead-207/Lead-204 ratio thematicClassification Lead-208/Lead-204 ratio thematicClassification text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.874334?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: OVG_Lake_Elum * LATITUDE: 6.333333 * LONGITUDE: 10.333333 * LOCATION: Cameroon * METHOD/DEVICE: Sampling by hand Position is estimated from map. EVENT LABEL: OVG_Lake_Nyos * LATITUDE: 6.445050 * LONGITUDE: 10.296570 * LOCATION: Cameroon * METHOD/DEVICE: Sampling by hand Position is estimated from map. EVENT LABEL: OVG_Lake_Oku * LATITUDE: 6.192778 * LONGITUDE: 10.453889 * LOCATION: Cameroon * METHOD/DEVICE: Sampling by hand Position is estimated from map. EVENT LABEL: OVG_Lake_Wum * LATITUDE: 6.411263 * LONGITUDE: 10.206900 * LOCATION: Cameroon * METHOD/DEVICE: Sampling by hand Position is estimated from map. Related to 2015-01-01 publication https://doi.org/10.1016/j.chemgeo.2015.03.030 Asaah, Asobo N E

asoboasaah@gmail.com

https://orcid.org/0000-0003-4940-6629 information author Yokoyama, Tetsuya https://orcid.org/0000-0003-2247-7232 information author Aka, Festus T author Usui, Tomohiro author Kuritani, Takeshi author Wirmvem, Mengnjo J author Iwamori, Hikaru author Fozing, Eric M author Tamen, Jules https://orcid.org/0000-0002-4302-5035 information author Mofor, Gilbert Z author Ohba, Takeshi author Tanyileke, Gregory author Hell, Joseph Victor author documentDigital Chemical Geology 406 55-69