Cu-S Isotope characteristics and metallogenic prediction of orebodies in the Dajing Sn-Cu polymetallic deposit in Inner Mongolia

被引：0
|
作者：
Wang Y. [1 ,2 ]
Su S. [1 ]
Zhang Q. [3 ]
Zhou Q. [2 ]
Zhang Y. [1 ]
机构：
[1] School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing
[2] China Nonferrous Metals (Guilin) Geology and Mining Co., Ltd., Guilin
[3] Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing
来源：
Earth Science Frontiers | 2022年 / 29卷 / 03期
关键词：
Concealed orebody; Cu isotope; Cu-Sn polymetallic deposit; Dajing deposit; S isotope;
D O I：
10.13745/j.esf.sf.2021.11.5
中图分类号：
学科分类号：
摘要：
The Dajing Sn-Cu polymetallic deposit in Inner Mongolia represents typical ore deposits in the Daxinganling metallogenic belt. The mining area is located in Linxi County, eastern Inner Mongolia, with geological conditions favorable for ore formation. Here, we studied Cu isotopes in chalcopyrite and S and Pb isotopes in chalcopyrite and pyrite orebodies. The measured δ65Cu value for chalcopyrite ranged from -0.46‰ to +0.32‰ overall, averaging at 0‰ with an average 2σ error of ~0.03‰; the δ34S values for chalcopyrite and pyrite ranged from +0.076‰ to +3.00‰ overall, averaging at +1.83‰, with relatively high uniformity, showing magma associated S isotopic characteristics. The ranges of Pb isotopic ratios were small overall; specifically, 206Pb/204Pb ranged between 18.291-18.353, 207Pb/204Pb between 15.501-15.574, and 208Pb/204Pb between 38.051-38.265. Together with previous studies in the region we show that, in the Dejing deposit, Cu isotopic changes occur during the sulfide-magma differentiation process. The δ65Cu variation pattern in chalcopyrite may indicate the direction of evolution of ore-forming sulfides in the mineralization stage. For instance, the direction of gradual δ65Cu value decreasing may point to concealed orebody. In the study area of the Dejing deposit, the mining district in the east shares similar Cu isotopic characteristics with the non-production target area of its periphery, where, according to Cu isotope evidence, may exist deep concealed orebodies. © 2022, Editorial Office of Earth Science Frontiers. All right reserved.
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页码：319 / 328
页数：9
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