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Contribution to Grain Size and Minerals of Four Alluvial Sands,
Central Red Sea Coast, Egypt
Aman A. Zalamah
Dept. Geology, Fac. Sciences, Zagazig Univ., Cairo, Egypt |
The granular and mineral composition of 4
samples from 4 main wadis (W. Essel. W. Um Gheig, W. Abu Dabbab and W. Ras Shagra),
central part of the Red Sea coast, Egypt, represent alluvium sediments. They were
deposited under dominant arid climatic conditions. These samples are studied to give a
contribution and to elucidate some environmental factors and comparisons with previous
works.
These sediments are mainly fine to very coarse sand, moderately to poorly sorted, strongly
fine skewed to strongly coarse skewed, and platy to very platykurtic. The heavy fractions
reflect the type of source rock which represents a mixture of sediments in the valley
banks, and the igneous (acid and basic) and metamorphic types at the upper reaches of the
vallies. Trace elements distribution shows anomalous contents related to the known mineral
deposits of Pb-Zn, Sr and rare metals. Wadis Um Gheig and Ras Shagra alluvium show
anomalous Mo content favoring prospecting for Mo in the granitic rocks exposed at their
upper reaches.
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