Abstract
The mineralogy of the sand dunes, between Minya and Dairut, Egypt, with special emphasis on the opaque minerals and their intergrowths is given. It is believed that the investigation of the opaque minerals could help in the elucidation of the sedimentational characteristics and the provenance of the concerned dunes. A variety of fabrics was recorded, the distribution of which led to the postulation that the dunes are derived from Miocene, Pliocene and Plio-Pleistocene sediments occurring to the north and west of these dune belts. The mother rock lies in the Nubia Sandstone Formation of presumed Upper Cretaceous age, however, additions from the Nile terraces and recent Nile sediments should be also considered. The ore-microscopic study showed that ilmenite is the main opaque mineral occurring with magnetite, hematite, rutile and pseudobrookite. Goethite, limonitic material, anatase, sphene and amorphous Fe−Ti oxides were formed due to alteration and replacement processes.
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