气候变化领域集成服务门户(CCPortal): Late Cretaceous-Palaeocene arc magmatism in Bumeicun, Gangdese, southern Tibet: Products of slab rollback of Neo-Tethyan Ocean?

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DOI	10.1002/gj.4719
	Late Cretaceous-Palaeocene arc magmatism in Bumeicun, Gangdese, southern Tibet: Products of slab rollback of Neo-Tethyan Ocean?
	Liu, Biao; Zhou, Qiushi; Jarquin, Esteban; Sha, Hao; Wang, Rui
发表日期	2023
ISSN	0072-1050
EISSN	1099-1034
起始页码	2526
结束页码	2554
卷号	58 期号:7
英文摘要	The most intense arc magmatism in the Gangdese arc occurred during the Palaeocene-Eocene, which is widespread across the entire southern Lhasa subterrane with Palaeocene-Eocene I-type intrusive rocks and Linzizong volcanic successions. What drives the voluminous magmatism remains enigmatic. New geochronological and geochemical data on Late Cretaceous-Palaeocene magmatic activity from Bumeicun, southern Tibet enables recognition of this distinct magmatic flare-up event that we ascribe to Neo-Tethyan Oceanic slab rollback. Bumeicun, located in the southern margin of Gangdese magmatic arc, exposes volcanic and plutonic rocks with close spatial-temporal links, and a wide range of silica content (53.0-74.7 wt.%). Zircon U-Pb dating result shows that the rocks form at 65.24 +/- 0.77-67.65 +/- 0.31 Ma. The Bumeicun igneous rocks are characterized by relative enrichment of large-ion lithophile elements, depletion of high field-strength elements (HFSEs) and enrichment of light rare earth elements, showing typical arc features. These rocks also show positive zircon epsilon(Hf)(t) value (+8.70 to+19.68), which are ascribed to the partial melting of arc mantle wedges. Followed by a succession of melt extraction and fractional crystallization, the coeval intermediate-felsic volcanic and plutonic rocks in Bumeicun are formed. Previous researches note that Gangdese magmatic arc had a period of magmatic quiescence in the Late Cretaceous, and a subsequent burst of magmatism occurred in the P-E. Our proposal of slab rollback model is consistent with the distinctly high zircon saturation temperatures (Tzr: 730-827 & DEG;C) of Bumeicun magmatism. In addition, the slab rollback led to the Gangdese arc magmatism migration from north to south from the Cretaceous to the Eocene.
关键词	Bumeicun Gangdese Late Cretaceous-Palaeocene slab rollback volcanic-plutonic rocks
英文关键词	ZIRCON U-PB; PORPHYRY CU-AU; PLUTONIC-VOLCANIC CONNECTION; CONTINENTAL COLLISION ZONES; HF ISOTOPIC CONSTRAINTS; LHASA TERRANE; GEOCHEMICAL CONSTRAINTS; ADAKITIC AFFINITIES; INTRUSIVE ROCKS; TRACE-ELEMENTS
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000948768500001
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/283254
作者单位	China University of Geosciences - Beijing; China University of Geosciences - Beijing; Nanjing University; China Geological Survey; Chinese Academy of Geological Sciences; China University of Geosciences - Beijing; China University of Geosciences - Beijing
推荐引用方式 GB/T 7714	Liu, Biao,Zhou, Qiushi,Jarquin, Esteban,et al. Late Cretaceous-Palaeocene arc magmatism in Bumeicun, Gangdese, southern Tibet: Products of slab rollback of Neo-Tethyan Ocean?[J],2023,58(7).
APA	Liu, Biao,Zhou, Qiushi,Jarquin, Esteban,Sha, Hao,&Wang, Rui.(2023).Late Cretaceous-Palaeocene arc magmatism in Bumeicun, Gangdese, southern Tibet: Products of slab rollback of Neo-Tethyan Ocean?.GEOLOGICAL JOURNAL,58(7).
MLA	Liu, Biao,et al."Late Cretaceous-Palaeocene arc magmatism in Bumeicun, Gangdese, southern Tibet: Products of slab rollback of Neo-Tethyan Ocean?".GEOLOGICAL JOURNAL 58.7(2023).