University of Khartoum

The Geology of Tehilla Complex, Kassala Province, Sudan

The Geology of Tehilla Complex, Kassala Province, Sudan

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Title: The Geology of Tehilla Complex, Kassala Province, Sudan
Author: Farouk, Ahmed
Abstract: The geology of Tehilla complex and the surrounding basement rocks are described. The latter are mainly metasedimentary schists and granitic gneisses with syntectonic intrusions of adamellites. The Tehilla complex shows great resemblance to Younger Granites of Northern Sudan and North Africa. It forms shallow, post – shaped outcrops of acid and basic intrustions of possible lower Palaezoic age. The basic rocks comprise an early phase of troctolites and norites emplaced in the form of a lopolth and sill – bodies respectively. The acid rocks (mainly granites) have been emplaced later as high – angle cone – sheet bodies. Contact relationships indicate a short evolutionary cycle for Tehilla igneous intrusion, since no chilled zone is detected. The complex has a general alkaline character and the predominance of basic rocks the acid ones, coupled with petrographic and chemical evidence suggest a comagmatic origin for the basic and acid rocks. Consequently a basic (basaltic?) alkaline magma has been proposed from which both rocks have evolved by a process of differentiation. The parent magma seems to be relatively dry and could have differentiated slowly underneath prior to intrusion.
URI: http://khartoumspace.uofk.edu/handle/123456789/13747
Date: 2015-06-22


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