TANG Yong-yong1,2, BI Xian-wu1, WU Li-yan1, WANG Lei3, ZOU Zhi-chao1,2, HE Li-ping4
(1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Chinese University of Geosciences, Wuhan, 430074, China;
4. Yunnan Jinding Zinc Industry Limited Company, Lanping County 671401, China)
Abstract: In this study, Re-Os isotopes of pyrite from the Jinding Pb-Zn deposit were carried out by ICP-MS method. According to occurrences of pyrite, they were identified as sedimentary diagenetic pyrite and hydrothermal pyrite, and showed large variation in contents of Re (0.4069×10-9 -375.2620×10-9) and Os (0.0008×10-9-0.4131×10-9), with low contents of Re and Os in some samples, they display two isochron ages of 114±13 Ma and 65±10 Ma, respectively. Combined with other geological evidences, it is concluded that the two ages could not represent the epoch of the main mineralization which are assessed at 37-28 Ma based on other geological constraints. However, 114 Ma is likely related to a mineralization event during diagenesis, while 65 Ma might indicate the beginning of hydrothermal mineralization of Jinding Zn-Pb deposit.
Key words: Re-Os isotope; pyrite; mineralization age; Jinding Zn-Pb deposit; Yunnan Province
E-mail: tangyong8514@163.com
ACTA MINERALOGICA SINICA Vol. 33, No. 3, 2013, Page 287-294
