Abstract
The Lower Carboniferous Um Bogma Formation in west-central Sinai, Egypt displays extensive and pervasive dolomitization. The combined petrographic/isotopic/stratigraphic investigations of the dolomite succession in the studied area reveal the presence of two distinct dolomite types: dolomite type (I) is confined to the basal part of the succession being associated with economic ferro-manganese deposits, and dolomite type (II) is located near the upper part of the succession. Silt, clay and marl beds vertically separate the two dolomitic units.
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