Geology, mineralogy and geochemistry of the Kekem dyke swarm (Western Cameroon): Insights into Paleozoic–Mesozoic magmatism and geodynamic implications
The broadly N70°–90°E-trending dykes swarm at Kekem cut across the Paleoproterozoic-to-Achean terranes of West Cameroon remobilized during the Pan-African orogeny. They are picrite basalts and basalts with tholeiitic/transitional affinity, as shown by mineralogical and geochemical data, with variabl...
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ftunivnapoliiris:oai:www.iris.unina.it:11588/693062 2024-06-23T07:56:47+00:00 Geology, mineralogy and geochemistry of the Kekem dyke swarm (Western Cameroon): Insights into Paleozoic–Mesozoic magmatism and geodynamic implications Tchaptchet, D. T. Wambo, N. A. S. Kouamo, N. A. K. Tchouankoué, J. -.P. Cucciniello, C. Tchaptchet, D. T. Wambo, N. A. S. Kouamo, N. A. K. Tchouankoué, J. -. P. Cucciniello, C. 2017 http://hdl.handle.net/11588/693062 https://doi.org/10.1016/j.crte.2017.02.005 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000410036100005 volume:349 issue:4 firstpage:175 lastpage:185 numberofpages:11 journal:COMPTES RENDUS. GÉOSCIENCE http://hdl.handle.net/11588/693062 doi:10.1016/j.crte.2017.02.005 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85026672059 info:eu-repo/semantics/article 2017 ftunivnapoliiris https://doi.org/10.1016/j.crte.2017.02.005 2024-06-03T14:38:38Z The broadly N70°–90°E-trending dykes swarm at Kekem cut across the Paleoproterozoic-to-Achean terranes of West Cameroon remobilized during the Pan-African orogeny. They are picrite basalts and basalts with tholeiitic/transitional affinity, as shown by mineralogical and geochemical data, with variable major and trace element contents, MgO ranges from 7.3 to 12.4 wt.%, Cr from 190 to 411 ppm, Ni from 15 to 234 ppm. All the dykes are light REE enriched with LaN/YbN values of 5.3–8.1, suggesting a co-magmatic origin. They originated from a 2.8% partial melting of a spinel-mantle source with no or little crustal input. The geochemical features of Kekem dykes are similar to those of Paleozoic and Mesozoic dykes recorded in North and Central Africa, suggesting multiple reactivations of pre-existing fractures that resulted in the fragmentation of western Gondwana and the opening of Central and South Atlantic Ocean. Article in Journal/Newspaper South Atlantic Ocean IRIS Università degli Studi di Napoli Federico II Comptes Rendus Geoscience 349 4 175 185 |
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IRIS Università degli Studi di Napoli Federico II |
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English |
description |
The broadly N70°–90°E-trending dykes swarm at Kekem cut across the Paleoproterozoic-to-Achean terranes of West Cameroon remobilized during the Pan-African orogeny. They are picrite basalts and basalts with tholeiitic/transitional affinity, as shown by mineralogical and geochemical data, with variable major and trace element contents, MgO ranges from 7.3 to 12.4 wt.%, Cr from 190 to 411 ppm, Ni from 15 to 234 ppm. All the dykes are light REE enriched with LaN/YbN values of 5.3–8.1, suggesting a co-magmatic origin. They originated from a 2.8% partial melting of a spinel-mantle source with no or little crustal input. The geochemical features of Kekem dykes are similar to those of Paleozoic and Mesozoic dykes recorded in North and Central Africa, suggesting multiple reactivations of pre-existing fractures that resulted in the fragmentation of western Gondwana and the opening of Central and South Atlantic Ocean. |
author2 |
Tchaptchet, D. T. Wambo, N. A. S. Kouamo, N. A. K. Tchouankoué, J. -. P. Cucciniello, C. |
format |
Article in Journal/Newspaper |
author |
Tchaptchet, D. T. Wambo, N. A. S. Kouamo, N. A. K. Tchouankoué, J. -.P. Cucciniello, C. |
spellingShingle |
Tchaptchet, D. T. Wambo, N. A. S. Kouamo, N. A. K. Tchouankoué, J. -.P. Cucciniello, C. Geology, mineralogy and geochemistry of the Kekem dyke swarm (Western Cameroon): Insights into Paleozoic–Mesozoic magmatism and geodynamic implications |
author_facet |
Tchaptchet, D. T. Wambo, N. A. S. Kouamo, N. A. K. Tchouankoué, J. -.P. Cucciniello, C. |
author_sort |
Tchaptchet, D. T. |
title |
Geology, mineralogy and geochemistry of the Kekem dyke swarm (Western Cameroon): Insights into Paleozoic–Mesozoic magmatism and geodynamic implications |
title_short |
Geology, mineralogy and geochemistry of the Kekem dyke swarm (Western Cameroon): Insights into Paleozoic–Mesozoic magmatism and geodynamic implications |
title_full |
Geology, mineralogy and geochemistry of the Kekem dyke swarm (Western Cameroon): Insights into Paleozoic–Mesozoic magmatism and geodynamic implications |
title_fullStr |
Geology, mineralogy and geochemistry of the Kekem dyke swarm (Western Cameroon): Insights into Paleozoic–Mesozoic magmatism and geodynamic implications |
title_full_unstemmed |
Geology, mineralogy and geochemistry of the Kekem dyke swarm (Western Cameroon): Insights into Paleozoic–Mesozoic magmatism and geodynamic implications |
title_sort |
geology, mineralogy and geochemistry of the kekem dyke swarm (western cameroon): insights into paleozoic–mesozoic magmatism and geodynamic implications |
publishDate |
2017 |
url |
http://hdl.handle.net/11588/693062 https://doi.org/10.1016/j.crte.2017.02.005 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000410036100005 volume:349 issue:4 firstpage:175 lastpage:185 numberofpages:11 journal:COMPTES RENDUS. GÉOSCIENCE http://hdl.handle.net/11588/693062 doi:10.1016/j.crte.2017.02.005 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85026672059 |
op_doi |
https://doi.org/10.1016/j.crte.2017.02.005 |
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