Tong Liu , Shao-Yong Jiang , Wei Wang , Hui-Min Su , Xing-Kai Zhang , Yong Zhang , Shuyue He
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引用次数: 0
Abstract
The East Kunlun orogenic belt (EKOB), one of the most significant Co-Ni metallogenic belts in China, hosts numerous Co-Ni deposits of both magmatic and hydrothermal types. The Kendekeke cobalt-rich Fe deposit, a notable skarn deposit, is located in the North Qimantagh belt of the EKOB. Co mineralization is concentrated mainly in the northern mining zone, with four distinct mineralization stages identified. Co mineralization primarily occurred in the early sulfide stage. Two independent Co-Ni minerals, namely, cobaltite (Co) and ullmannite (Ni), have been identified as closely coexisting with chalcopyrite and pyrrhotite in the Kendekeke deposit. U–Pb dating of apatite in both the northern and southern mining zones yields consistent results, with ages concentrated at approximately 225 Ma, closely related to the monzogranite in the Kendekeke ore district. Cobalt occurs in two forms: as an independent mineral, cobaltite, and as an isomorphic substitute in sulfides or sulfarsenides, including pentlandite and pyrite. Pentlandite, with an average chemical formula of (Ni5.04Fe3.56Co0.35)S8. 00 on the base of EPMA results, has an average Co content of 2.67 wt%. Compared with the theoretical S/Fe atomic molar ratio and the binary diagram between Fe and Co, Co is more likely to substitute for Fe in pentlandite. By combining fluid inclusion and mineral paragenesis data, it has been determined that the controlling factors of Co mineralization are temperature and oxygen fugacity. Finally, a Co mineralization model was established for the Kendekeke cobalt-rich Fe deposit.
期刊介绍:
Ore Geology Reviews aims to familiarize all earth scientists with recent advances in a number of interconnected disciplines related to the study of, and search for, ore deposits. The reviews range from brief to longer contributions, but the journal preferentially publishes manuscripts that fill the niche between the commonly shorter journal articles and the comprehensive book coverages, and thus has a special appeal to many authors and readers.