A model for the origin of the alkaline complexes of Egypt
作者： Phil de Gruyter , Thomas A. Vogel
DOI: 10.1038/291571A0
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摘要: The alkaline complexes in the Nubian Shield of Egypt range age from 554 to 89 Myr BP (refs 1–3) and, where data are available, have similar and primitive initial strontium ratios 87Sr/86Sr (ref. 1). These intrusive with respect petrography, major element chemistry, rare earth distribution other trace distribution1,4–7; they intimately associated lineaments (Fig. 1)8. It is likely that all them had a origin, not directly related rifting and/or doming. We suggest here origin these due melts having been formed asthenosphere by shear heating, caused changes plate motion. were emplaced along reactivated Pan-African fractures or pre-existing zones weakness.
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