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Geochemistry of the volcanic rocks from Bioko Island(“cameroon hot line”)： Evidence for plume-lithosphere interaction

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Geoscience Frontiers 2016年第5期7卷 743-757页

作者： Fadimatou Ngounouno Yamgouot Bernard Déruelle Isaac Bertrand Gbambié Mbowou Ismaila Ngounouno Daniel Demaiffe Departement des Sciences de la Terre Faculte des Sciences Universite de Ngaoundere B.P. 454 Ngaoundere Cameroon Laboratoire de Magmatologie et Ceochimie lnorganique et Experimentale (MAGIE) Institut de Physique du Globe de Paris UMR 7154 Universite Pierre et Marie Curie 4 place Jussieu 75252 Paris cedex 05 France Departement des Mines et de la Geologie Ecole de Geologie et d'Exploitation Miniere (EGEM) Universite de Ngaoundere B.R 115 Meiganga Cameroon Laboratoire de Geochimie lsotopique et Geodynamique Chimique DSTE (CP 160/02) Universite Libre de Bruxelles 50 av. Roosevelt 1050 BruxellesBelgium

Bioko Island（3008 m a.s.l） is located in the presently more active volcanic zone of the cameroon line and composed essentially of alkaline basalts and hawaiites, and lesser mugearites. The rocks show microlitic porphyritic texture with phenocrysts of olivine（83% 〈 Fo 〈 87%） and clinopyroxene in a matrix of plagioclase, clinopyroxene and oxides. Hawaiites and mugearites also include phenocrysts of plagioclase（An62-67Ab35-32Or3-1）. Major element variation diagrams show an increase in Si O2, Al2O3, Na2 O and K2 O with increasing Mg O for the studied rock groups. The rocks are characterized by low（^86Sr/^87Sr）i ratios（0.70320e0.70406）, high 3Nd（t） values（2.56e4.33） and high（^206Pb/^204Pb）i ratios（20.032e20.035） *** are enriched in LILE and LREE, and have（Hf/Sm）N= 0.57e1.16. These geochemical signatures are similar to those of the Mount cameroon rocks, and might be attributed to low degrees of partial melting from a garnet-amphibole-bearing mantle source. The trace elements and isotopic compositions suggest that the parental magma source might have involved HIMU- and EM1-components.

关键词： Geochemistry HIMU-EM1 Volcanic rocks Bioko cameroon hot line

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Petrological and Geochemical Studies on the Si-Undersaturated Rocks of the Mount cameroon: Genesis of the Camptonite and Nephelinite at the cameroon hot line

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Open Journal of Geology 2021年第6期11卷 239-252页

作者： Ntoumbé Mama Amaya Adama Diguim Kepnamou Amadou Mbowou Gambie Isaac Bertrand Naimou Seguem Ngounouno Ismaïla Department of Mines Geology School of Geology and Mining Engineering University of Ngaoundere Meiganga Cameroon Department of Geomatic and Geology Mapping School of Geology and Mining Engineering University of Ngaoundere Meiganga Cameroon Department of Geology Faculty of Sciences and Techniques University Adam Barka of Abeche Abeche Chad

The cameroon hot line is dominated by magmatic rocks. The variations of magma and chemistry are generally due to the difference of physical conditions and chemistry in the magma source region during the ascent of magma. The Mt Etinde and the Mt cameroon, both edifices belong to the cameroon hot line, have a particularity some rare rocks such as camptonite and nephelinite. The relationship between the silica undersaturated rocks in the both edifices is characterized by the lateral variation appear through the petrography of the different rocks. The concerned geochemical data allow to compare the Mount Etinde nephelinite and Mount cameroon camptonite where the differentiation process reflects geochemical affinities from a basaltic magma source on the cameroon hot line. The compatible elements between the Mount Etinde nephelinite and the Mount cameroon camptonite and basalt correlate with the difference in modal compositions of mineral phases. The lateral variation of major and trace element contents in the Mount cameroon camptonite and Mount Etinde nephelinite seem to be related to the difference in the fractional crystallization processes of mineral phases, the difference in the partial melting processes and the metasomatism source rich in volatile. The silica-undersaturated character of the camptonite and nephelinite could be attributed to assimilation of carbonate rocks within depth-level magma chambers. Trace element AFC modelling revealed that the parental magmas of both edifice volcanic rocks were mostly affected by fractional crystallisation coupled with metasomatism process in Ca rich source.

关键词： Nephelinite Camptonite Link Source cameroon hot line

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Petrology of the Volcanic Rocks from Bioko Island(“cameroon hot line”)

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International Journal of Geosciences 2015年第3期6卷 247-255页

作者： Fadimatou Ngounouno Yamgouot Bernard Deruelle Isaac Bertrand Gambie Mbowou Ismaila Ngounouno Departement des Sciences de la Terre Facultedes SciencesUniversite de NgaoundereNgaoundereCameroun Laboratoire de Magmatologie et Géochimie Inorganique et Expérimentale(MAGIE) Institut de Physique du Globe de ParisUniversite Pierre et Marie CurieParisFrance Département des Mines et de la Géologie Ecole de Geologie et d’Exploitation Minière(EGEM)Universite de NgaoundéréMeigangaCameroun

Bioko island (3008 m a.s.l.), is composed of the alkaline basaltic lavas (basalts and hawaiites) with xenoliths. These lavas have a microlitic textureand consisted of euhedral to subhedral phenocrysts?(>1 mm) of olivine (0.83 cameroon hot line. Such high ratios are commonly observed in alkaline basaltic lavas associated with carbonatitic and/or nephelinitic magmatism. The Sr and Nd isotopic compositions point to a slightly depleted mantle source.

关键词： Petrology Geochemistry Lavas Bioko cameroon hot line

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