气候变化领域集成服务门户(CCPortal): Petrogenesis and tectonic implications of Palaeocene (ca. 54 Ma) rhyolites in the western Lhasa Terrane, south Tibet: Constraints from geochemistry and Sr-Nd-Hf isotope compositions

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DOI	10.1002/gj.3976
	Petrogenesis and tectonic implications of Palaeocene (ca. 54 Ma) rhyolites in the western Lhasa Terrane, south Tibet: Constraints from geochemistry and Sr-Nd-Hf isotope compositions
	Ding, Xiang-Li; Ding, Lin; Wang, Chao; Wang, Hou-Qi; Guo, Xu-Dong
通讯作者	Wang, C (通讯作者)
发表日期	2021
ISSN	0072-1050
EISSN	1099-1034
起始页码	494
结束页码	507
卷号	56 期号:1
英文摘要	The widespread Linzizong volcanic successions (LVS) in the Lhasa Terrane was a magmatic response to the tectonic transition from Neo-Tethyan oceanic subduction to the India-Asia collision, which has been the subject of many studies; however, studies on the LVS in the western Lhasa Terrane are scarce compared to those in the east, limiting our understanding of the tectonic transition. Zircon U-Pb ages of two rhyolitic samples from the Shiquanhe region in the west of the Lhasa Terrane indicate that at least part of the Zenong Group, previously thought to have formed during the Early Cretaceous, was actually erupted during the Late Palaeocene (ca. 54 Ma) and belongs to the LVS. The rhyolites are characterized by high SiO(2)and Al2O3, moderate K2O and Na2O, and low MgO, CaO, and FeO contents, enrichment in Rb and Th, depletion in Sr, Ba, Eu, Nb, and Ta, and have relatively uniform whole-rock epsilon(Nd)(t) (-1.90 to -0.89) and zircon epsilon(Hf)(t) (+0.95 to +5.03) values. These geochemical characteristics indicate that they were formed by the partial melting of juvenile continental crust with subsequent plagioclase, biotite, amphibole, and Fe-Ti oxide fractionation. Combined with the results of previous studies, our data show that the western Lhasa Terrane underwent intensive Early Cenozoic crustal growth, similar to what occurred in the east, due to underplating of mantle-derived magma resulting from the roll-back and eventual break-off of the Neo-Tethys slab after the initial continental collision.
关键词	LINZIZONG VOLCANIC SUCCESSION A-TYPE GRANITES TI-IN-ZIRCON GANGDESE MOUNTAINS O ISOTOPES ROCKS AREA GEOCHRONOLOGY GENESIS SATURATION
英文关键词	crustal melting; high-SiO(2)rhyolite; Lhasa Terrane; Linzizong volcanic successions; Palaeocene; zircon geochemistry
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000564218000001
来源期刊	GEOLOGICAL JOURNAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260139
推荐引用方式 GB/T 7714	Ding, Xiang-Li,Ding, Lin,Wang, Chao,et al. Petrogenesis and tectonic implications of Palaeocene (ca. 54 Ma) rhyolites in the western Lhasa Terrane, south Tibet: Constraints from geochemistry and Sr-Nd-Hf isotope compositions[J]. 中国科学院青藏高原研究所,2021,56(1).
APA	Ding, Xiang-Li,Ding, Lin,Wang, Chao,Wang, Hou-Qi,&Guo, Xu-Dong.(2021).Petrogenesis and tectonic implications of Palaeocene (ca. 54 Ma) rhyolites in the western Lhasa Terrane, south Tibet: Constraints from geochemistry and Sr-Nd-Hf isotope compositions.GEOLOGICAL JOURNAL,56(1).
MLA	Ding, Xiang-Li,et al."Petrogenesis and tectonic implications of Palaeocene (ca. 54 Ma) rhyolites in the western Lhasa Terrane, south Tibet: Constraints from geochemistry and Sr-Nd-Hf isotope compositions".GEOLOGICAL JOURNAL 56.1(2021).