气候变化领域集成服务门户(CCPortal): Sphalerite and Pyrite Geochemistry from the Pusangguo Co-Rich Cu-Zn-Pb Skarn Deposit, Tibet: Implications for Element Occurrence and Mineralization

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DOI	10.3390/min13091165
	Sphalerite and Pyrite Geochemistry from the Pusangguo Co-Rich Cu-Zn-Pb Skarn Deposit, Tibet: Implications for Element Occurrence and Mineralization
	Li, Zhuang; Tan, Hao; Zhao, Feng; Xiang, Zuopeng; Wu, Han; Zhang, Peng
发表日期	2023
EISSN	2075-163X
卷号	13 期号:9
英文摘要	The Pusangguo deposit (1.42 Mt @ 1.42% Cu, 0.14 Mt @ 1.82% Zn, 0.08 Mt @ 1.01% Pb, and 285.8 t Co @ 140 g/t Co) is the first Co-rich Cu-Zn-Pb skarn deposit discovered in the Gangdese metallogenic belt. However, the trace and minor element geochemistry of the sulfides in this deposit has not been studied, limiting further understanding of elements' occurrence and mineralization. Here, we identified four ore stages, and two types of sphalerites (SpI and SpII) and pyrites (PyI and PyII), in this deposit. In this study, LA-ICP-MS in-situ trace element analyses were conducted on sphalerite and pyrite, to obtain their chemical compositions, elemental substitution mechanisms, and mineralization physicochemical conditions. The results indicate that two types of sphalerites are generally more enriched with Co than pyrite. SpI has higher concentrations of Co, Cr, Cu, Ag, and As compared to SpII. Both types of sphalerite have very low contents of Sn, Ge, and Ga. PyII has higher contents of most trace elements, such as Co, Ni, Mn, Zn, Cu, As, Sn, Se, Pb, Ag, and Bi, compared to PyI. Both types of pyrite are poor in Mn, Ga, Ge, and Cd, but enriched in As, Co, and Ni. The Mn, Fe, Co, and Cd in sphalerite, and Co, Ni, and Mn in pyrite are generally lattice-bound, while Cu, As, Ag, and Sb are usually present in both micro-inclusions and coupled substitution. Significant elemental correlations in sphalerite indicate the possible substitution mechanisms 2Fe2+ + Ga2+ & LRARR; 3Zn2+, 2Fe2+ + Ge4+ & LRARR; 4Zn2+, and (Sb3+, Sn3+) + (Cu+, Ag+) & LRARR; 2Zn2+. The correlation trends between trace elements in pyrite suggest the coupled substitution mechanisms of (Tl+ + Cu+ + Ag+) + (As3+ + Sb3+) & LRARR; 2Zn2+ and As3+ + Cu+ & LRARR; 2Zn2+. The mineralization temperature at Pusangguo, as determined by the GGIMFis sphalerite geothermometer, is 237-345 & DEG;C (avg. 307 & DEG;C), consistent with the high Zn/Cd ratio (avg. 203), low Ga/In (avg. 0.06), and high In/Ge (avg. 15.9) in sphalerite, and high Co/Ni ratio (avg. 24) in pyrite. These results indicate that the ore-forming fluid was high-temperature, with a low sulfur fugacity (fS2) (10-13.4 to 10-8.3) and low oxygen fugacity (fO2). The high temperature, and low sulfur fugacity and oxygen fugacity of the ore-forming fluid, and the fluid-mixing process, jointly controlled the sulfide precipitation, which caused the formation of the Pusangguo deposit.
关键词	LA-ICP-MS sulfides geochemistry trace element occurrence substitution Pusangguo Tibet
英文关键词	LA-ICP-MS; TRACE-ELEMENTS; MINOR ELEMENTS; SOUTHERN TIBET; VOLCANIC-ROCKS; POLYMETALLIC DEPOSITS; BEARING SPHALERITE; METALLOGENIC BELT; SULFIDE MINERALS; OXIDATION-STATE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001072305400001
来源期刊	MINERALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283067
作者单位	Neijiang Normal University; Chengdu University of Technology; Ministry of Natural Resources of the People's Republic of China
推荐引用方式 GB/T 7714	Li, Zhuang,Tan, Hao,Zhao, Feng,et al. Sphalerite and Pyrite Geochemistry from the Pusangguo Co-Rich Cu-Zn-Pb Skarn Deposit, Tibet: Implications for Element Occurrence and Mineralization[J],2023,13(9).
APA	Li, Zhuang,Tan, Hao,Zhao, Feng,Xiang, Zuopeng,Wu, Han,&Zhang, Peng.(2023).Sphalerite and Pyrite Geochemistry from the Pusangguo Co-Rich Cu-Zn-Pb Skarn Deposit, Tibet: Implications for Element Occurrence and Mineralization.MINERALS,13(9).
MLA	Li, Zhuang,et al."Sphalerite and Pyrite Geochemistry from the Pusangguo Co-Rich Cu-Zn-Pb Skarn Deposit, Tibet: Implications for Element Occurrence and Mineralization".MINERALS 13.9(2023).