Abstract

Field relations, petrography and chemical composition constrain old and young volcanic sequences for the formation of the Neoproterozoic-Early Cambrian Nuqara rock belts. These volcanics are a part of a post-subduction and extensional-related magmatic event in east Egypt. The two volcanic sequences differ in phenocryst mineralogy (hydrous vs anhydrous assemblages) and whole-rock major and trace element chemistry. Their eruptions were punctuated by occasional volcaniclastic deposits that generated fall, flow or reworked suites compositionally identical to the lava flows. The model proposed for their origin involves contrasting ascent paths and differentiation histories through crustal columns with different thermal and density gradients.

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