Abstract
Trace element distributions and interrelationships in the lenticular Mn ore bodies of Um Bogma, Sinai, are utilized to establish physicochemical conditions of formation and diagenesis. The deposits are considered to be shallow marine in origin. Mineralogical and chemical data suggest that these ores were subjected to various diagenetic processes which resulted in the separation of manganese from iron, several ore types being recognized: a) a mixture of Fe and Mn considered to be the original one (mixed ore); b) Mn-rich types; c) Fe-rich types. In this investigation, chemical and mineralogical data and interrelationships are employed to evaluate environmental conditions prevailing during diagenesis.
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