气候变化领域集成服务门户(CCPortal): Ore genesis of the Mengya'a distal Pb-Zn deposit in the Lhasa terrane, Tibet, China: Constraints from in situ garnet U-Pb dating and C-H-O-Sr isotopes

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DOI	10.1002/gj.4871
	Ore genesis of the Mengya'a distal Pb-Zn deposit in the Lhasa terrane, Tibet, China: Constraints from in situ garnet U-Pb dating and C-H-O-Sr isotopes
	Cheng, Wen-Bin; Chen, Si; Peng, Yi-Wei; Li, Chen-Wei
发表日期	2024
ISSN	0072-1050
EISSN	1099-1034
起始页码	405
结束页码	421
卷号	59 期号:2
英文摘要	A large amount of distal skarn Pb-Zn deposits without any causative intrusions exposed have been discovered along the eastern Nyainqentanglha metallogenic belt (NMB) in the Gangdese region, Tibet, China. As a typical distal skarn Pb-Zn deposit in the east of NMB, the Mengya'a deposit is adjacent to the Longmala Pb-Zn +/- Cu +/- Fe deposit. However, the linkage between these two deposits is not unclear due to the chaotic dating results. In situ Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) U-Pb dating of reddish-brown and yellow-green garnet from Mengya'a yielded lower intersect ages of 53.6 +/- 3.1 and 52.4 +/- 4.4 Ma, respectively, indicating that Pb-Zn mineralization took place during the main collision stage of the India-Asia plates. The delta DSMOW values of garnet, quartz and calcite vary from -148.4 parts per thousand to -140.4 parts per thousand, -123.5 parts per thousand to -115.3 parts per thousand and -127.9 parts per thousand to -121.3 parts per thousand, with the delta 18OH2O values ranging from 5.8 parts per thousand to 6.6 parts per thousand, 0.4 parts per thousand to 3.7 parts per thousand and 1.0 parts per thousand to 1.7 parts per thousand, respectively. The delta 13CV-PDB and delta 18OSMOW values of calcite range from -8.2 parts per thousand to -4.7 parts per thousand and 9.8 parts per thousand to 18.6 parts per thousand, respectively. These C-H-O isotopic compositions of hydrothermal minerals indicate that the ore-forming fluids were initially derived from the magmatic water with progressive input of meteoric water from the prograde stage to the retrograde stage. The 87Sr/86Sr(53 Ma) ratios of sphalerite (0.72321-0.73474) are consistent with those of Ando gneiss in the Lhasa-Golmud area, indicating that the basement gneiss makes a great contribution for the source of ore-forming materials. The newly obtained garnet U-Pb ages at Mengya'a are consistent with those of mineralization and causative intrusion in the Longmala Pb-Zn +/- Fe +/- Cu deposit, suggesting that the Mengya'a and Longmala deposits constitute an integrated distal skarn-type system. This proposed hypothesis suggests that the Fe-Cu +/- Pb +/- Zn mineralization within the contact zone should focus on the locations beneath the identified Pb-Zn orebodies at Longmala and Pb-21 orebody at Mengya'a.
关键词	distal skarn mineralization in situ garnet U-Pb dating isotopes Mengya'a Tibet
英文关键词	ABLATION ICP-MS; HYDROGEN ISOTOPE; COPPER-DEPOSIT; SM-ND; TH-PB; SKARN; GEOCHRONOLOGY; SYSTEMATICS; EVOLUTION; OXYGEN
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001075685400001
来源期刊	GEOLOGICAL JOURNAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283048
作者单位	Chengdu University of Technology; Ministry of Natural Resources of the People's Republic of China; Chengdu University of Technology; University of Regina; Chengdu University of Technology
推荐引用方式 GB/T 7714	Cheng, Wen-Bin,Chen, Si,Peng, Yi-Wei,et al. Ore genesis of the Mengya'a distal Pb-Zn deposit in the Lhasa terrane, Tibet, China: Constraints from in situ garnet U-Pb dating and C-H-O-Sr isotopes[J],2024,59(2).
APA	Cheng, Wen-Bin,Chen, Si,Peng, Yi-Wei,&Li, Chen-Wei.(2024).Ore genesis of the Mengya'a distal Pb-Zn deposit in the Lhasa terrane, Tibet, China: Constraints from in situ garnet U-Pb dating and C-H-O-Sr isotopes.GEOLOGICAL JOURNAL,59(2).
MLA	Cheng, Wen-Bin,et al."Ore genesis of the Mengya'a distal Pb-Zn deposit in the Lhasa terrane, Tibet, China: Constraints from in situ garnet U-Pb dating and C-H-O-Sr isotopes".GEOLOGICAL JOURNAL 59.2(2024).