气候变化领域集成服务门户(CCPortal): Sulfide saturation in reduced magmas during generation of the Gangdese juvenile lower crust: Implications for porphyry Cu-Au mineralization in the Gangdese belt, Tibet

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DOI	10.1007/s00126-024-01269-0
	Sulfide saturation in reduced magmas during generation of the Gangdese juvenile lower crust: Implications for porphyry Cu-Au mineralization in the Gangdese belt, Tibet
	Sun, Jin-Lei; Bai, Zhong-Jie; Zhong, Hong; Liu, Xu; Zhu, Jing-Jing; Chen, Lan; Zhu, Wei-Guang
发表日期	2024
ISSN	0026-4598
EISSN	1432-1866
英文摘要	The S saturation and oxidation states of arc magmas are important factors in the formation of porphyry Cu-Au deposits. The Milin juvenile lower crustal cumulates (86.7-84.3 Ma) in the Gangdese provide insights into how sulfide saturation and oxidation states control porphyry mineralization. Zircons from the cumulates have low Ce4+/Ce3+ ratios (21-90) and reduced oxygen fugacities (Delta FMQ-1.8 +/- 0.5), which cannot be explained by fractional crystallization or crustal contamination, suggesting inheritance from a mantle source. Partial melting of the mantle under reduced conditions produced a sulfide-saturated primary arc magma with low chalcophile element contents owing to the residual sulfide in the mantle. The Milin lower crustal cumulates contain sulfides, indicating that the magma reached sulfide saturation in the early stages of magmatic differentiation. Based on our model, the primary arc magma before sulfide saturation contained 66.7 ppm Cu and 1.0 ppb Au. The residual magma after sulfide saturation in the lower crust contained 33-66 ppm Cu, 0.13-0.93 ppb Au; i.e., lower contents than those in arc basalts worldwide. Both these factors hindered the formation of Late Cretaceous large porphyry Cu-Au deposits in the Gangdese belt. Remelting of the Milin sulfide-rich cumulates can generate a Cu-rich andesitic magma only under high temperature and high-fO2 conditions, and a melt with low Cu content under low temperature even high-fO2 conditions. Thus, the temperature plays a crucial role in the remelting of the lower crust whether provide enough metals to match the Gangdese Miocene post-collisional porphyry Cu deposit.
英文关键词	Gangdese belt; juvenile lower crust; Late Cretaceous; porphyry Cu-Au deposits; sulfide saturation
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001207020400001
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/303630
作者单位	Chinese Academy of Sciences; Institute of Geochemistry, CAS; Jilin University; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chongqing University of Science & Technology
推荐引用方式 GB/T 7714	Sun, Jin-Lei,Bai, Zhong-Jie,Zhong, Hong,et al. Sulfide saturation in reduced magmas during generation of the Gangdese juvenile lower crust: Implications for porphyry Cu-Au mineralization in the Gangdese belt, Tibet[J],2024.
APA	Sun, Jin-Lei.,Bai, Zhong-Jie.,Zhong, Hong.,Liu, Xu.,Zhu, Jing-Jing.,...&Zhu, Wei-Guang.(2024).Sulfide saturation in reduced magmas during generation of the Gangdese juvenile lower crust: Implications for porphyry Cu-Au mineralization in the Gangdese belt, Tibet.MINERALIUM DEPOSITA.
MLA	Sun, Jin-Lei,et al."Sulfide saturation in reduced magmas during generation of the Gangdese juvenile lower crust: Implications for porphyry Cu-Au mineralization in the Gangdese belt, Tibet".MINERALIUM DEPOSITA (2024).