El-Kammar, A. M.

Osman, H. M.

Shaalan, M. B.

English

The iron ore deposits of Ankur area, northeast Sudan, occupy a constant geological position slightly transverse and discordant to the general foliation of the host rocks (biotite schists and andesitic tuffs). The normative composition of the studied ore is calculated to cover the following mineral assemblage; quartz, orthoclase, albite, anorthite, corundum, acmite, wollastonite, enstatite, ferrosilite, magnetite, hematite, ilmenite, apatite and pyrite. Magnetite and hematite showed opposit distribution patterns, which may suggests that hematite is a product of martitization of magnetite. The iron ore of the area under investigation are remarkably enriched in the trace elements; Y, Cu, Co and Cr, and depleted in the content of Ni, Zn, Rb and Sr, compared to the average of the earth's crust. The V module of magnetites reflects a metamorphic origin of the deposits. V 3+  is believed to be accommodated in the magnetite lattice, substituting for Fe3+ , while Cr, Co, Ni and Zn are most probably accumulated by the alumino-silicates. Rb occurs in the potash alumino-silicates, replacing for K. The absence of the correlation between Sr and Ca may favour the believing that the studied deposits are of metamorphic origin

Geochemistry of Ankur iron ore deposits, NE Sudan

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