气候变化领域集成服务门户(CCPortal): Determining multiple fluid pulse and evolution using zoned garnet in Mengya'a skarn Pb-Zn-polymetallic deposit, Tibet

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DOI	10.1016/j.oregeorev.2023.105795
	Determining multiple fluid pulse and evolution using zoned garnet in Mengya'a skarn Pb-Zn-polymetallic deposit, Tibet
	Jiang, Xiaojia; Ma, Ying; Kang, Yimin; Yi, Jianzhou; Yan, Jun; Gao, Shunbao; Chen, Lie; Zheng, Youye
发表日期	2023
ISSN	0169-1368
EISSN	1872-7360
卷号	163
英文摘要	Skarn deposits, which serve as a significant source of Pb, Zn, Fe, W, Cu, and Au, are typically formed through interactions between fluids and carbonate rocks. However, the discovery of skarn deposits faces obstacles due to a limited understanding of the factors influencing their size. Many studies increasingly assume that the presence of large skarn deposits may be closely associated with multi-stage fluid pulses. Nonetheless, this assumption has not undergone explicit testing. In this study, zoned garnet grains from the large Mengya'a Pb-Zn-polymetallic deposits were used to unravel the multi-stage fluid pulse and evolution within a magmatic-hydrothermal system. In-situ major and trace elemental analysis reveals that the garnets exhibit two distinct zones, namely Ti-Alenriched (G1) and Ti-Al-poor (G2) zones. The G1 domains are characterized by high HFSEs, slight enrichment in heavy rare earth elements (HREE), and minor variable Eu anomalies, as well as a linear relationship between REE and Y concentrations. These observations suggest that their formation reflects the fluid flux in a nearly closed system. The G2 domains exhibit oscillatory zoning in Al, Fe, Sn, HFSE, and various other elements, reflecting the intermittent flow of fluids originating from a degassing magma reservoir. The Al-, Zn-, and HFSE-rich characteristics of G2, along with their low 8Eu anomalies in comparison to G1, are associated with fluids that have undergone multiple recharge events from a magma chamber containing a significant amount of meteoric water in an open system. The presence of Sn-rich and In-rich zones within G2, accompanied by high 8Eu anomalies, indicates a gradual cooling and evolution of the pulsed fluids, resulting in the enrichment of Sn and volatile elements in the remaining fluid. Consequently, it can be concluded that the contribution of multiple fluid flows from a recharged magma chamber, undergoing extended cooling and evolution, plays a pivotal role in the formation of large skarn deposits. An additional implication of this study is that the zoning of Sn in garnet serves as a crucial indicator of Sn mineralization within skarn deposits.
关键词	Mengya 'a Fluid pulses Garnet Pb-Zn-polymetallic deposit Gangdese belt
英文关键词	LA-ICP-MS; PORPHYRY CU-MO; RARE-EARTH-ELEMENTS; RE-OS GEOCHRONOLOGY; FE-AU DEPOSIT; TRACE-ELEMENTS; LHASA TERRANE; U-PB; ORE-DEPOSITS; ZONATION PATTERNS
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001124413400001
来源期刊	ORE GEOLOGY REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283178
作者单位	China University of Geosciences - Wuhan; China University of Geosciences - Wuhan
推荐引用方式 GB/T 7714	Jiang, Xiaojia,Ma, Ying,Kang, Yimin,et al. Determining multiple fluid pulse and evolution using zoned garnet in Mengya'a skarn Pb-Zn-polymetallic deposit, Tibet[J],2023,163.
APA	Jiang, Xiaojia.,Ma, Ying.,Kang, Yimin.,Yi, Jianzhou.,Yan, Jun.,...&Zheng, Youye.(2023).Determining multiple fluid pulse and evolution using zoned garnet in Mengya'a skarn Pb-Zn-polymetallic deposit, Tibet.ORE GEOLOGY REVIEWS,163.
MLA	Jiang, Xiaojia,et al."Determining multiple fluid pulse and evolution using zoned garnet in Mengya'a skarn Pb-Zn-polymetallic deposit, Tibet".ORE GEOLOGY REVIEWS 163(2023).