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East Qinling molybdenum deposit molybdenite rhenium content and multi-type characteristics

East Qinling is a major molybdenum llogenic belt on the southern margin of the North China platform and contains Jinduicheng and Shijiawan porphyry type molybdenum deposits and Huanglongpu carbonate type molybdellilm (lead) deposit in Shanxi Province as well as Nannihu-Sandaozhuang and Shangfanggou porphyry-skarn type molybdenum (tungsten) and molybdenum (iron) deposits in Henan Province.

Studies show that rhenium in molybdenite from the Huanglongpu molybdendm (lead) deposit has values of comprehensive utilition: the average Re content is 152.5 ppm, 14 times and 7 times higher than Re content of molybdenite from the porphyty type molybdenum deposit and from the porphyry-skarn type molybdenum (tungsten) deposit respectively.

Nevertheless, as 187Re is unstable and frequently converts into 187Os, molybdenite as the major carrier of Re commonly contains different quantities of Os. Re and Os mainly occur in the form of isomorphism in molybdenite. As for polytypes, it is determined that molybdenite from different types of molybdenum in this region is exclusively of 2H type and 2H+3R type, with no relationship existent betWeen the polytype variety and the Re content or ore-forming temperature.

It is therefore concluded that the difference in rhenium content of molybdenite from these molybdenum deposits depends mainly on geneses of these molybdenum deposits and initial rhenium concentrations of ore-forming hydrothermal fluids, whereas polytypes of molybdenite have no typomorphic significance for these types of molybdenum deposits.

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