气候变化领域集成服务门户(CCPortal): Magmatic response to slab breakoff of the Neo-Tethyan ocean: Constraints from Eocene diorites and gabbros in the southern Lhasa terrane, Tibet

CCPortal

DOI	10.1016/j.jseaes.2023.105673
	Magmatic response to slab breakoff of the Neo-Tethyan ocean: Constraints from Eocene diorites and gabbros in the southern Lhasa terrane, Tibet
	Meng, Yuanku; Yuan, Haoqi; Wang, Zhenzhen; Wei, Youqing
发表日期	2023
ISSN	1367-9120
EISSN	1878-5786
卷号	251
英文摘要	The India-Asia collision holds significant implications for understanding continental collision dynamics. It is essentially controlled by various dynamic processes, including oceanic slab subduction, slab rollback, and slab breakoff, all of which are accompanied by extensive magmatic activities in convergent margins. However, the magmatic consequences of the Neo-Tethyan slab breakoff during the India-Asian collision remain ambiguous. In the middle segment of the southern Lhasa terrane, two episodes of magmatism (-55 Ma and - 50 Ma) have been preserved. In this study, we present whole-rock major and trace elements, zircon U-Pb ages, and whole-rock SrNd-Hf isotopes of the - 55 Ma Gaga pluton and conduct a comprehensive comparison with the two episodes of magmatic mixing events. The Gaga host diorites were formed by the partial melting of the Neo-Tethyan oceanic slab and underwent amphibole fractional crystallization. The Gaga gabbroic enclaves, which are associated with magma mixing, originated from lithosphere mantle metasomatized by subduction-related fluids. Notably, the Gaga pluton exhibits more prominent arc-type characteristics of Nb-Ta and Zr-Hf negative anomalies than the 50 Ma intrusive rocks in adjacent areas. The genetic transition of Eocene magmatic rocks indicates that the - 55 Ma Gaga pluton formed during the initial stage of slab breakoff, and the - 50 Ma magmatic pluton was produced during the late stage of slab breakoff.
关键词	Slab breakoff Magmatism Lhasa terrane Adakitic rocks Mafic enclaves
英文关键词	CONTINENTAL-CRUST GROWTH; INDIA-ASIA COLLISION; ADAKITE-LIKE ROCKS; VOLCANIC-ROCKS; ISOTOPIC CONSTRAINTS; CALC-ALKALINE; POSTCOLLISIONAL TRANSITION; GANGDESE BATHOLITH; MAFIC MAGMATISM; NEO-TETHYS
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000983083600001
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283529
作者单位	Shandong University of Science & Technology; Shandong University of Science & Technology; Ministry of Natural Resources of the People's Republic of China
推荐引用方式 GB/T 7714	Meng, Yuanku,Yuan, Haoqi,Wang, Zhenzhen,et al. Magmatic response to slab breakoff of the Neo-Tethyan ocean: Constraints from Eocene diorites and gabbros in the southern Lhasa terrane, Tibet[J],2023,251.
APA	Meng, Yuanku,Yuan, Haoqi,Wang, Zhenzhen,&Wei, Youqing.(2023).Magmatic response to slab breakoff of the Neo-Tethyan ocean: Constraints from Eocene diorites and gabbros in the southern Lhasa terrane, Tibet.JOURNAL OF ASIAN EARTH SCIENCES,251.
MLA	Meng, Yuanku,et al."Magmatic response to slab breakoff of the Neo-Tethyan ocean: Constraints from Eocene diorites and gabbros in the southern Lhasa terrane, Tibet".JOURNAL OF ASIAN EARTH SCIENCES 251(2023).