气候变化领域集成服务门户(CCPortal): Copper behavior in arc-back-arc systems: Insights into the porphyry Cu metallogeny of the Gangdese belt, southern Tibet

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DOI	10.1007/s00126-023-01199-3
	Copper behavior in arc-back-arc systems: Insights into the porphyry Cu metallogeny of the Gangdese belt, southern Tibet
	Wang, Xuhui; Lang, Xinghai; Turlin, Francois; Deng, Yulin; Xie, Fuwei; He, Qing; Moritz, Robert
发表日期	2024
ISSN	0026-4598
EISSN	1432-1866
起始页码	133
结束页码	154
卷号	59 期号:1
英文摘要	The genetic link between subduction- and collision-related porphyry Cu deposits (PCD) is still not well understood. The Gangdese porphyry Cu belt (GPCB) in southern Tibet hosts two parallel E-W-oriented metallogenic subbelts, including a southern Jurassic subduction-related and a northern Miocene post-collision PCD subbelt. In this study, we combine new and published whole-rock major and trace element data, Cu isotopic compositions and zircon trace element data of Jurassic magmatic rocks from the GPCB. Combined Sr/Y and La/Yb crustal thickness proxies confirm the south to north geometry of the Jurassic arc-back-arc system across the GPCB. The southern Jurassic magmatic arc rocks have systematically higher whole-rock V/Yb ratios, & delta;Cu-65 values and zircon Eu/Eu* ratios compared to those of the northern back-arc region. This suggests that Jurassic southern arc magmas had higher oxygen fugacity and H2O concentration than the contemporaneous northern back-arc magmas, which was controlled by a steep subduction geometry of the Neo-Tethyan oceanic slab. Hydrous and oxidized magmas resulted in Cu enrichment during magma evolution and generation of Jurassic PCD in the southern magmatic arc by inhibiting early sulfide saturation at deep crustal levels. In contrast, the northern back-arc magmas were less oxidized and less hydrous, which triggered early sulfide saturation, resulting in segregation of Cu-bearing sulfides in lower crustal cumulates that provided a favorable metal source for later Miocene PCD in the northern subbelt. Our study indicates that the Jurassic subduction geometry controlled the formation and distribution of Jurassic subduction-related and Miocene post-collision-related PCD in the GPCB.
关键词	Porphyry Cu deposit Arc-back-arc system Cu isotopes H2O concentration Oxygen fugacity Gangdese belt
英文关键词	JURASSIC VOLCANIC-ROCKS; RARE-EARTH-ELEMENTS; CONTINENTAL COLLISION; ISOTOPE FRACTIONATION; OXIDATION-STATE; LHASA TERRANE; U-PB; XIONGCUN DISTRICT; OXYGEN FUGACITY; YEBA FORMATION
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001048588100001
来源期刊	MINERALIUM DEPOSITA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283262
作者单位	Chengdu University of Technology; University of Geneva
推荐引用方式 GB/T 7714	Wang, Xuhui,Lang, Xinghai,Turlin, Francois,et al. Copper behavior in arc-back-arc systems: Insights into the porphyry Cu metallogeny of the Gangdese belt, southern Tibet[J],2024,59(1).
APA	Wang, Xuhui.,Lang, Xinghai.,Turlin, Francois.,Deng, Yulin.,Xie, Fuwei.,...&Moritz, Robert.(2024).Copper behavior in arc-back-arc systems: Insights into the porphyry Cu metallogeny of the Gangdese belt, southern Tibet.MINERALIUM DEPOSITA,59(1).
MLA	Wang, Xuhui,et al."Copper behavior in arc-back-arc systems: Insights into the porphyry Cu metallogeny of the Gangdese belt, southern Tibet".MINERALIUM DEPOSITA 59.1(2024).