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DOI10.1016/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
ISSN0169-1368
EISSN1872-7360
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 depositZircon U-Pb datingMolybdenite Re -OsNorth QaidamQinghai -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
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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).
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