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Chemical composition, genesis and exploration implication of garnet from the Hongshan Cu-Mo skarn deposit, SW China
Zhen-Dong Tian;  Cheng-Biao Leng;  Xing-Chun Zhang;  Tehseen Zafar;  Le-Jun Zhang;  Wei Hong;  Chun-Kit Lai
2019
发表期刊Ore Geology Reviews
卷号112页码:1-22
摘要

In this study, we present new mineral chemical data on the garnet from the Hongshan Cu-Mo deposit, one of the largest skarn deposits in the Sanjiang Tethyan tectonic domain, in SW China. The aims are to unravel the formation mechanism of the oscillatory-zoned garnet at Hongshan, and to explore possible applications using garnet trace element to distinguish different types of skarn deposits.

Two generations of garnets, i.e., poorly-zoned garnet I (Grt I) and the well-zoned garnet II (Grt II), are identified from the endoskarn and exoskarn, at Hongshan based on field and petrographic observations. EPMA and LA-ICP-MS analyses show that Grt I contains a narrow compositional range (Adr40.07-61.25 Grs36.65-57.08), and chondrite-normalized HREE-enriched and LREE-depleted patterns with minor positive Eu anomalies. In contrast, Grt II shows a wide compositional range (Adr27.78-67.53 Grs30.67-70.92 to almost pure andradite Adr94.41-99.99 Grs0.00-4.21) with interlayered Al-rich and Fe-rich zones. In Grt II, its Al-rich zone is chemically similar to Grt I, whereas its Fe-rich zone exhibits chondrite-normalized LREE-enriched and HREE-depleted patterns with distinct positive Eu anomalies. The positive REE3+ vs. Mg correlations, and the poor REE3+ vs. Y and Ca correlations, altogether indicate that the REE3+ incorporated into garnet was co-influenced by the menzerite-type substitution mechanism (Ca2+-1VIIIREE3++1VIIIAl3+-1VIMg2++1VI), fluid chemistry, and the physicochemical conditions of precipitation. The higher U contents and HREE-enriched patterns of Grt I suggest that it was formed under a relatively reducing and near-neutral pH condition. Varying U contents and REE patterns across different oscillatory zones indicate that Grt II was probably formed under alternating physicochemical fluctuations led by repeating crack-seal cycles in the hydrothermal system. Besides, chemical data compilation suggests that the garnet from different types of skarn deposits has different compositions, and can be used as mineral prospecting tools. We suggested that discrimination plots, such as δEu vs. V and δCe vs. U, can distinguish Cu skarn deposit from other skarn deposit types, whilst the U vs. W plot can discriminate between Cu, W, W-Sn and W-Mo skarn deposits.

关键词Garnetmineral Chemistry chemical Zonation skarn Deposit elemental Substitution
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10536
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Centre for Ore Deposit and Earth Sciences (CODES), University of Tasmania, Hobart 7001, Australia
5.Faculty of Science, Universiti Brunei Darussalam, Gadong BE1410, Brunei
推荐引用方式
GB/T 7714
Zhen-Dong Tian;Cheng-Biao Leng;Xing-Chun Zhang;Tehseen Zafar;Le-Jun Zhang;Wei Hong;Chun-Kit Lai. Chemical composition, genesis and exploration implication of garnet from the Hongshan Cu-Mo skarn deposit, SW China[J]. Ore Geology Reviews,2019,112:1-22.
APA Zhen-Dong Tian;Cheng-Biao Leng;Xing-Chun Zhang;Tehseen Zafar;Le-Jun Zhang;Wei Hong;Chun-Kit Lai.(2019).Chemical composition, genesis and exploration implication of garnet from the Hongshan Cu-Mo skarn deposit, SW China.Ore Geology Reviews,112,1-22.
MLA Zhen-Dong Tian;Cheng-Biao Leng;Xing-Chun Zhang;Tehseen Zafar;Le-Jun Zhang;Wei Hong;Chun-Kit Lai."Chemical composition, genesis and exploration implication of garnet from the Hongshan Cu-Mo skarn deposit, SW China".Ore Geology Reviews 112(2019):1-22.
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