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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Sr and Nd isotopic geochemistry of the early ultramafic-mafic rocks of the Mako bimodal volcanic belt of the Kedougou-Kenieba inlier (Senegal)
Arabian Journal of Geosciences, Volume 3, No. 1, Year 2010
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Description
The Mako bimodal volcanic belt of the Kédougou-Kéniéba inlier is composed of volcanic basalts and peridotites interbedded by quartzites and limestones intruded by different generations of granitoïds. The early volcanic episode of the belt is constituted of submarine basalts with peridotite similar to those of the oceanic abyssal plains. It is intruded by the Badon Kakadian TTG-granitic batholite dated around 2200 Ma. The second volcanic phase is constituted of basaltic, andesitic, and felsitic flows exhibit structures of aerial volcanic rocks. It is intruded by granites dated between 2160 and 2070 Ma. The general pattern of trace element variation of submarine volcanic rocks is consistent with those of basalts from oceanic plateaus which are the modern equivalent of the Archean greenstones belts. The Nd and Sr isotopic systematics typical of juvenile material indicates that the source of these igneous rocks is derived from a depleted mantle source. These results are consistent with the idea of a major accretion within the West African Craton occurring at about 2. 1 Ga and corresponding to an important process of mantle-oceanic lithosphere differentiation. © 2009 Saudi Society for Geosciences.
Authors & Co-Authors
Ngom, Papa Malick
Senegal, Dakar
Université Cheikh Anta Diop de Dakar
Cordani, Umberto G.
Brazil, Sao Paulo
Universidade de São Paulo
Teixeira, Wilson
Brazil, Sao Paulo
Universidade de São Paulo
de Assis Janasi, Valdecir
Brazil, Sao Paulo
Universidade de São Paulo
Statistics
Citations: 4
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1007/s12517-009-0051-3
ISSN:
18667511
e-ISSN:
18667538
Study Locations
Senegal