| Autor: |
Asobo N.E. Asaah, Tetsuya Yokoyama, Festus T. Aka, Tomohiro Usui, Mengnjo J. Wirmvem, Boris Chako Tchamabe, Takeshi Ohba, Gregory Tanyileke, J.V. Hell |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Geoscience Frontiers, Vol 6, Iss 4, Pp 557-570 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
1674-9871 |
| DOI: |
10.1016/j.gsf.2014.04.012 |
| Popis: |
The origin and petrogenesis of the Cameroon Volcanic Line (CVL), composed of volcanoes that form on both the ocean floor and the continental crust, are difficult to understand because of the diversity, heterogeneity, and nature of available data. Major and trace elements, and Sr-Nd-Pb isotope data of volcanic rocks of the CVL spanning four decades have been compiled to reinterpret their origin and petrogenesis. Volcanic rocks range from nephelinite, basanite and alkali basalts to phonolite, trachyte and rhyolite with the presence of a compositional gap between SiO2 58–64 wt.%. Similarities in geochemical characteristics, modeled results for two component mixing, and the existence of mantle xenoliths in most mafic rocks argue against significant crustal contamination. Major and trace element evidences indicate that the melting of mantle rocks to generate the CVL magma occurred dominantly in the garnet lherzolite stability field. Melting models suggest small degree ( |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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