气候变化领域集成服务门户(CCPortal): In-situ geochemical and sulfur isotope signature of pyrite: Constraints on ore-forming processes of the Qulong Cu-Mo deposit, Tibet

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DOI	10.1016/j.oregeorev.2023.105639
	In-situ geochemical and sulfur isotope signature of pyrite: Constraints on ore-forming processes of the Qulong Cu-Mo deposit, Tibet
	Yu, Kelong; Li, Guangming; Hollings, Pete; Li, Jinxiang; Zhao, Junxing; Jiang, Guangwu; Zou, Xinyu; Qin, Kezhang; Gao, Jun
发表日期	2023
ISSN	0169-1368
EISSN	1872-7360
卷号	162
英文摘要	The post-collisional Qulong porphyry Cu-Mo deposit is the largest in the Gangdese Cu belt, southern Tibet. Despite many previous studies, the evolution of ore-forming fluids in the Qulong deposit remains controversial. Pyrite-bearing veins at Qulong can be divided into seven subclasses, including Mt-type, Bt-type, A-type, B-type, C-type, D-type, and E-type veins. To decipher the evolution of magmatic-hydrothermal fluids at Qulong, in situ LA-ICP-MS trace element and sulfur isotope compositions of pyrites from different veins were analyzed. The delta 34S values (+1.01%o to + 4.28%o) for pyrites indicate a magmatic sulfur source and the high Se/S ratios of pyrite at Qulong are consistent with hydrothermal fluids being mainly magma-derived. The low Co/Ni ratio (0.01-0.1) of pyrite in Mt-type vein suggests that the earliest magmatic-hydrothermal fluids may have contributed from mafic magma injection. From Mt- to Bt- to A-type veins, the delta 34S values in the hydrothermal fluids decrease as the temperature decreases, whereas the Cu and Co contents increase and the As and Ni contents decrease. In B- and C-type veins, the relatively high and stable Co and Ni contents and the range of delta 34S isotope values in pyrite indicate the existence of multiple-stages of magmatic-hydrothermal fluids during the main mineralization period. During the late stages of mineralization, the decrease of Co, Ni and As contents and increase of Cu in pyrite in D- and E-type veins, as well as the narrow range of delta 34S values, may be due to decreasing temperature as a result of fluid dilution caused by mixing with meteoric waters. The slightly negative delta 34S fluid values for chalcopyrite (-1.56%o to -0.75%o) in sample Q711-1968 also suggests the addition of external water at Qulong.
关键词	Pyrite Trace elements Sulfur isotopes Qulong deposit Porphyry Cu-Mo deposit Fluid evolution
英文关键词	LA-ICP-MS; PORPHYRY COPPER-DEPOSIT; MAGMATIC-HYDROTHERMAL EVOLUTION; TRACE-ELEMENT COMPOSITIONS; MASSIVE SULFIDE DEPOSITS; FLUID EVOLUTION; GOLD DEPOSIT; MOLYBDENUM DEPOSIT; SEDIMENTARY PYRITE; SOUTHERN TIBET
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001083542800001
来源期刊	ORE GEOLOGY REVIEWS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283064
作者单位	Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Lakehead University; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS
推荐引用方式 GB/T 7714	Yu, Kelong,Li, Guangming,Hollings, Pete,et al. In-situ geochemical and sulfur isotope signature of pyrite: Constraints on ore-forming processes of the Qulong Cu-Mo deposit, Tibet[J]. 中国科学院青藏高原研究所,2023,162.
APA	Yu, Kelong.,Li, Guangming.,Hollings, Pete.,Li, Jinxiang.,Zhao, Junxing.,...&Gao, Jun.(2023).In-situ geochemical and sulfur isotope signature of pyrite: Constraints on ore-forming processes of the Qulong Cu-Mo deposit, Tibet.ORE GEOLOGY REVIEWS,162.
MLA	Yu, Kelong,et al."In-situ geochemical and sulfur isotope signature of pyrite: Constraints on ore-forming processes of the Qulong Cu-Mo deposit, Tibet".ORE GEOLOGY REVIEWS 162(2023).