NDLI: Re-Os pyrite geochronology of Zn-Pb mineralization in the giant Caixiashan deposit, NW China

Content Provider	Springer Nature Link
Author	Li, Dengfeng Chen, Huayong Hollings, Pete Zhang, Li Mi, Mei Li, Jie Fang, Jing Wang, Chengming Lu, Wanjian
Copyright Year	2016
Abstract	The newly discovered Caixiashan Irish-type Zn-Pb deposit (∼131 Mt at 3.95 % Zn + Pb), located in the Eastern Tianshan of Xinjiang, is one of the largest Zn-Pb deposits in NW China. Massive colloform/framboidal textured syn-sedimentary pyrite yielded a Re-Os isochron age of 1019 ± 70 Ma (MSWD = 3.5), which is interpreted to be the depositional age of the Kawabulake group that hosts the ore. The age of the main mineralization stage is constrained by two types of pyrite: the layered pyrite coexists with recrystallized calcite and dolomite and is locally replaced by sphalerite, whereas the euhedral pyrite occurs with galena that crosscuts the massive sphalerite. The layered pyrite yielded a Re-Os age of 859 ± 79 Ma (MSWD = 6.7; initial 187Os/188Os ratio [IOs] = 0.19 ± 0.25) and the euhedral pyrite 837 ± 39 Ma (MSWD = 6.5; [IOs] = 0.16 ± 0.09), which are interpreted to be the Zn and Pb mineralization ages, respectively. The low radiogenic initial Os values of the Zn-Pb mineralization suggest interaction between a hydrothermal fluid and a mafic or ultramafic source rock with a mantle Os signature with some contamination with Mesoproterozoic Kawabulake group. Based on our new Re-Os ages, we conclude that the giant Caixiashan Zn-Pb deposit formed in the early Neoproterozoic and it represents a newly identified mineralization epoch in the Eastern Tianshan of the Central Asia Orogenic Belt.
Starting Page	309
Ending Page	317
Page Count	9
File Format	PDF
ISSN	00264598
Journal	Mineralium Deposita
Volume Number	51
Issue Number	3
e-ISSN	14321866
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-23
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pyrite Re-Os Irish-type Pb-Zn deposit Caixiashan Eastern Tianshan Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geophysics Economic Geology Geochemistry and Petrology

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