气候变化领域集成服务门户(CCPortal): Petrogenesis of the Quxu intrusive complex: Implications for Eocene magmatism in the southern Lhasa Terrane, Tibet

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DOI	10.1002/gj.4690
	Petrogenesis of the Quxu intrusive complex: Implications for Eocene magmatism in the southern Lhasa Terrane, Tibet
	Yu, Yanqiu; Guan, Qi; Woo, Ik; Li, Zengsheng; Jing, Tianjing; Wang, Duixing
发表日期	2023
ISSN	0072-1050
EISSN	1099-1034
起始页码	1727
结束页码	1740
卷号	58 期号:5
英文摘要	The widely distributed Eocene mafic microgranular enclaves in the Lhasa Terrane of southern Tibet carry important information regarding crust-mantle interactions in collisional zones. Here, we report geochronological and geochemical data of granitoids and mafic enclaves from Quxu in the southern Lhasa Terrane. Zircon LA-ICP-MS U-Pb dating indicates that the Quxu granitoids and enclaves were synchronously emplaced at ca. 50 Ma. The granitoids are medium- to high-K calc-alkaline, metaluminous (A/CNK = 0.82-0.90) and have high Al2O3 (14.48-16.57 wt%) and low MgO (2.81-2.99 wt%). The mafic enclaves (SiO2 = 50.55-54.57 wt%) have 5.12-5.37 wt% MgO and an Mg-# of 49-51, with weakly negative Eu anomalies (Eu/Eu* = 0.85-0.91). The Quxu granitoids and enclaves have similar zircon Hf isotopic compositions, with epsilon(Hf)(t) values ranging from +7.62 to +13.32. A comprehensive study of the data available for coeval rocks from the Gangdese Batholith indicates that the Quxu granitoids were derived from partial melting of the lower crust, while the parental magmas of the mafic enclaves were most likely derived from lithospheric mantle beneath southern Tibet. The Quxu granitoids are interpreted as the result of mixing between the lower crust-derived melts and lithospheric mantle-derived mafic melts, which are likely the magmatic response to the breakoff of the Neo-Tethyan Oceanic slab at about 50 Ma.
关键词	Gangdese Batholith Lhasa Terrane mafic enclave zircon U-Pb geochronology
英文关键词	CONTINENTAL-CRUST GROWTH; JURASSIC VOLCANIC-ROCKS; INDIA-ASIA COLLISION; EAST-WEST EXTENSION; ZIRCON U-PB; SLAB BREAKOFF; ISOTOPIC CONSTRAINTS; GANGDESE BATHOLITH; YEBA FORMATION; CALC-ALKALINE
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000934320500001
来源期刊	GEOLOGICAL JOURNAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283044
作者单位	Hebei GEO University; Kunsan National University; Hebei GEO University; Ministry of Natural Resources of the People's Republic of China; Hebei GEO University; Hebei GEO University
推荐引用方式 GB/T 7714	Yu, Yanqiu,Guan, Qi,Woo, Ik,et al. Petrogenesis of the Quxu intrusive complex: Implications for Eocene magmatism in the southern Lhasa Terrane, Tibet[J],2023,58(5).
APA	Yu, Yanqiu,Guan, Qi,Woo, Ik,Li, Zengsheng,Jing, Tianjing,&Wang, Duixing.(2023).Petrogenesis of the Quxu intrusive complex: Implications for Eocene magmatism in the southern Lhasa Terrane, Tibet.GEOLOGICAL JOURNAL,58(5).
MLA	Yu, Yanqiu,et al."Petrogenesis of the Quxu intrusive complex: Implications for Eocene magmatism in the southern Lhasa Terrane, Tibet".GEOLOGICAL JOURNAL 58.5(2023).