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New geochemical and petrographic data on the Gabbro-Syenite Suite between Hargeysa and Berbera-Shiikh (northern Somalia)

Author:
Abdalla, JA  Said, AA  Visona, D  


Journal:
JOURNAL OF AFRICAN EARTH SCIENCES


Issue Date:
1996


Abstract(summary):

The Somali crystalline basement in northern Somalia contains a Neoproterozoic igneous suite essentially composed of gabbros with minor syenitic and granitic bodies. This Gabbro-Syenite Suite (GSS) was emplaced at a relatively high crustal level and is related to Late Precambrian crustal extension. The basic plutons are composed mostly of gabbro with petrographic and geochemical characteristics ranging from N-type to T- and P-type MORB. This compositional variability points to heterogeneous sub-continental mantle sources. The plutons do not show significant in situ differentiation, suggesting that the cumulitic rocks may be related to cooling processes developed in deeper magma chambers and/or during magma ascent. Copyright (C) 1997 Elsevier Science Ltd.


Page:
363---373


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