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DOI	10.1130/B36741.1
	Two stages of porphyry Cu mineralization at Jiru in the Tibetan collisional orogen: Insights from zircon, apatite, and magmatic sulfides
	Sun, Xiang; Deng, Jun; Lu, Yongjun; Si, Xiaobo; Hollings, Pete; Santosh, M.; Li, Qiang; Zheng, Xu
发表日期	2023
ISSN	0016-7606
EISSN	1943-2674
起始页码	2971
结束页码	2986
卷号	135 期号:11-12
英文摘要	Continental collision-related porphyry copper (Cu) deposits provide significant global copper resources, but their genesis remains controversial because it is not clear whether remelting of remnant arc-derived lower-crustal Cu-rich cumulates is critical to their formation. We investigated zircon and apatite compositions of the Jiru porphyry Cu deposit in the Gangdese belt of southern Tibet, which is characterized by weaker early Eocene mineralization and more pronounced strate that apatite hosted in zircon can record the volatile compositions of magma before fluid exsolution. Zircon-hosted apatites from the early Eocene granite that have low XF/XCl ratios (53) and are interpreted to have crystallized from volatile-undersaturated magma have Cl contents of 0.96-2.14 wt% (1.86 +/- 0.38 wt%; n = 15) and SO3 contents of 0.01-0.14 wt% (0.08 +/- 0.04 wt%; n = 15). In contrast, zircon-hosted apatites from the Miocene porphyry that have low XF/XCl ratios (510) and are interpreted to have crystallized from volatile-undersaturated magma have Cl contents of 0.40-0.56 wt% (0.47 +/- 0.06 wt%; n = 11) and SO3 contents of 0.20-0.92 wt% (0.59 +/- 0.29 wt%; n = 11). In addition, the early Eocene magma was relatively reduced (Delta FMQ = 0.86 +/- 0.55, compared with the oxidized Miocene magma (Delta FMQ = 2.04 +/- 0.43). The contrasting magmatic oxidation states and apatite/melt S contents were likely critical in controlling the different scales of Cu mineralization during the early Eocene and Miocene, as more highly oxidized magma can dissolve much larger amounts of sulfur and metals (e.g., Cu). Melt Cl content may not play a critical role in magma fertility, since the Jiru early Eocene granite had higher melt Cl contents than the rhotite, chalcopyrite, and pyrite) were not recognized in the Miocene zircons but did occur in the early Eocene zircons, and these sulfides were demonstrated to have crystallized before fluid exsolution in the shallow magma reservoir. The Jiru early Eocene magmatic sulfide saturation might not have enhanced the amount of copper available to hydrothermal fluids during the early Eocene. Late-stage sulfide saturation in the previous arc magmas might reduce the potential for that is associated with remelting of the previ ous arc lower crust.
英文关键词	JURASSIC VOLCANIC-ROCKS; EASTERN GANGDESE BELT; ADAKITE-LIKE ROCKS; SOUTHERN TIBET; OXIDATION-STATE; ARC MAGMAS; XIONGCUN DISTRICT; SILICATE MELTS; AU DEPOSIT; U-PB
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001133129700004
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283692
作者单位	China University of Geosciences - Beijing; Geological Survey of Western Australia; University of Western Australia; University of Western Australia; Lakehead University; University of Adelaide
推荐引用方式 GB/T 7714	Sun, Xiang,Deng, Jun,Lu, Yongjun,et al. Two stages of porphyry Cu mineralization at Jiru in the Tibetan collisional orogen: Insights from zircon, apatite, and magmatic sulfides[J],2023,135(11-12).
APA	Sun, Xiang.,Deng, Jun.,Lu, Yongjun.,Si, Xiaobo.,Hollings, Pete.,...&Zheng, Xu.(2023).Two stages of porphyry Cu mineralization at Jiru in the Tibetan collisional orogen: Insights from zircon, apatite, and magmatic sulfides.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,135(11-12).
MLA	Sun, Xiang,et al."Two stages of porphyry Cu mineralization at Jiru in the Tibetan collisional orogen: Insights from zircon, apatite, and magmatic sulfides".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 135.11-12(2023).