气候变化领域集成服务门户(CCPortal): The Ahadawa deposit-A newly discovered porphyry Cu-Mo system in the North Qaidam, Northern Qinghai-Tibet Plateau, NW China

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DOI	10.1016/j.oregeorev.2023.105783
	The Ahadawa deposit-A newly discovered porphyry Cu-Mo system in the North Qaidam, Northern Qinghai-Tibet Plateau, NW China
	He, Shuyue; Zhong, Shihua; Zhang, Aikui; Zhang, Yong; Dai, Wei; Lin, Gui; Zhang, Daming; Liu, Yongle; Dong, Jien
发表日期	2023
ISSN	0169-1368
EISSN	1872-7360
卷号	163
英文摘要	Ongoing exploration in the North Qaidam, Northern Qinghai-Tibet Plateau, NW China, has led to the identification of a porphyry Cu-Mo system centered on Ahadawa. In this study, we conducted a detailed geochronological and geochemical study on porphyritic monzogranite from the Ahadawa deposit, which hosts the Cu-Mo mineralization. The weighted mean zircon U-Pb ages for three mineralized porphyritic monzogranite samples from different sites range from 218.8 +/- 1.2 Ma (MSWD = 1.5) to 224.7 +/- 1.6 Ma (MSWD = 1.8), and finally to 233.1 +/- 0.9 Ma (MSWD = 1.4, n = 23). These results, combined with antecrystic grains as old as similar to 245.7 Ma, collectively indicate more than 25 Ma multi-stage magmatic emplacement activity in the Ahadawa deposit. Corresponding to complex magma episodes, six studied molybdenite samples yielded variable Re-Os model ages ranging from 436.7 +/- 6.6 to 232.6 +/- 1.2 Ma, with the three youngest dates constraining a weighted mean Re-Os age of 234.0 +/- 6.8 Ma. The 234 Ma mineralization age is consistent with the observed Late Triassic magmatism, whereas the Re-Os model ages of 436.7 to 245.7 Ma, if they remain robust through future investigation, may highlight a long-lived hydrothermal activity in the Ahadawa deposit. Whole-rock and zircon compositions indicate that the Late Triassic porphyries occurring at the surface display distinct geochemical features, with the early porphyritic monzogranite of 233.1 Ma characterized by much higher whole-rock Sr/Y, and zircon Eu/Eu* and Ce/Ce* than the younger (218.8 Ma and 224.7 Ma, respectively) porphyritic monzogranite. This suggests that the Late Triassic magmas were initially characterized by high water content and high oxidation state and the differences between the old and two younger groups might be related to plagioclase-dominated fractionation. The finding of the Ahadawa porphyry system highlights the need for ongoing exploration (especially in poorly studied remote areas) and systematically geochronological and geochemical studies to constrain the temporal and spatial evolution of mineralized episodes within a complex, protracted magmatic history.
关键词	Porphyry Cu deposit Zircon U-Pb dating Molybdenite Re -Os North Qaidam Qinghai -Tibet Plateau
英文关键词	TRACE-ELEMENT COMPOSITION; ADAKITE-LIKE ROCKS; OXIDATION-STATE; TECTONIC EVOLUTION; OCEANIC SUBDUCTION; VOLCANIC-ROCKS; COPPER-DEPOSIT; GANGDESE BELT; ARC MAGMAS; ZIRCON
WOS研究方向	Geology ; Mineralogy ; Mining & Mineral Processing
WOS记录号	WOS:001128373100001
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/282958
作者单位	Ocean University of China; Ocean University of China; Laoshan Laboratory
推荐引用方式 GB/T 7714	He, Shuyue,Zhong, Shihua,Zhang, Aikui,et al. The Ahadawa deposit-A newly discovered porphyry Cu-Mo system in the North Qaidam, Northern Qinghai-Tibet Plateau, NW China[J],2023,163.
APA	He, Shuyue.,Zhong, Shihua.,Zhang, Aikui.,Zhang, Yong.,Dai, Wei.,...&Dong, Jien.(2023).The Ahadawa deposit-A newly discovered porphyry Cu-Mo system in the North Qaidam, Northern Qinghai-Tibet Plateau, NW China.ORE GEOLOGY REVIEWS,163.
MLA	He, Shuyue,et al."The Ahadawa deposit-A newly discovered porphyry Cu-Mo system in the North Qaidam, Northern Qinghai-Tibet Plateau, NW China".ORE GEOLOGY REVIEWS 163(2023).