Mineralogy, geochemistry and genesis of the Banded Iron Formations (BIFs) of Semna and Abu Marawat areas, northern Eastern Desert, Egypt

Zeinab Taman, Abdel Moneim M. Osman, Peter W. Scott, M. Ezzeldin Hilmy

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Late Proterozoic layered volcanics (metavolcanics) and volcaniclastics associated with Banded Iron Formations (BIFs) occur at Semna and Abu Marawat. As part of the BIFs occurrences in the Eastern Desert of Egypt, their nature arises much debate about their origin. Detailed investigations have been applied to indicate their mineralogy, textures, geochemistry and their genetic significance. The studied BIFs are interbedded concordantly with the topmost part of metabasalt and metatuffites (lentil). The metavolcanics (originally submarine volcanics) form a thick succession of weakly regionally metamorphosed pyroclastics and lava flows of tholeiitic basaltic, basaltic-andesitic and andesitic compositions. Original textures are more or less preserved. Mineral assemblages consist mainly a/quartz (jasper), hematite, and magnetite. It is concluded that the deposition of the BIFs took place in island-arc environs, probably back-arc
basins.

Abu Marawat BlF represents shallower and proximal deposit compared to Semna BIF which represents a deeper and more distal relative to the volcanogenic hydrothermal source. Silica concentrated by biogenic processes is not excluded.
Original languageEnglish
Title of host publicationMiddle Earth Research Centre, Ain Shams University, Earth Science Series
Pages1-17
Number of pages17
Volume19
Publication statusPublished - 2005

Publication series

NameEarth Science Series
PublisherMiddle Earth Research Centre, Ain Shams University

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