气候变化领域集成服务门户(CCPortal): Record of an oceanic island in the Neo-Tethys Ocean (lowermost Cretaceous Xiazha Formation, Yarlung-Zangbo suture zone, South Tibet)

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DOI	10.1016/j.lithos.2023.107439
	Record of an oceanic island in the Neo-Tethys Ocean (lowermost Cretaceous Xiazha Formation, Yarlung-Zangbo suture zone, South Tibet)
	Wang, Jian-Gang; Li, Wei-Tong; Liu, Zhi-Chao; Meng, Zhongyu; Garzanti, Eduardo
发表日期	2024
ISSN	0024-4937
EISSN	1872-6143
卷号	464
英文摘要	The Xiazha Formation recently identified in the Yarlung-Zangbo suture zone of southern Tibet has been considered as crucial evidence for early (pre-Cretaceous) subduction of Neo-Tethyan oceanic lithosphere. In this study, we carried out an integrated stratigraphic, petrographic, and geochemical study of the Xiazha Formation, which consists of abyssal chert, siliceous mudrocks, and calcareous turbidites deposited onto basaltic basement. Basalt geochemistry indicates alkali to tholeiitic magmas generated in a within-plate oceanic setting. The siliciclastic fraction contained in calcareous turbidites consists of plagioclase and mafic-rock fragments derived from the underlying basalts, and includes Cr-spinel grains with relatively high TiO2 and moderate Al2O3 concentrations pointing to an OIB source. Based on these data, and virtual lack of detritus of continental origin, we infer that the Xiazha Formation was deposited in oceanic island/plateau within the Neo-Tethyan domain. Its stratigraphy records an evolution from basaltic eruptions to the development of a carbonate platform surrounding the basaltic island, and finally to drowning of the atoll. The Xiazha Formation was not deposited in a subductionrelated basin and, therefore, cannot be used as evidence for pre-Cretaceous initiation of the Yarlung subduction zone.
关键词	Yarlung-Zangbo suture Xiazha Formation Neo-Tethys Oceanic island Subduction onset Southern Tibet
英文关键词	XIGAZE FORE-ARC; ZIRCON U-PB; ASIA COLLISION ONSET; VOLCANIC-ROCKS; CONTINENTAL COLLISION; SOUTHWESTERN TIBET; ZEDONG TERRANE; TRACE-ELEMENT; HF ISOTOPES; LU-HF
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001134381500001
来源期刊	LITHOS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282801
作者单位	Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Sun Yat Sen University; China Geological Survey; Tianjin Center, China Geological Survey; University of Milano-Bicocca
推荐引用方式 GB/T 7714	Wang, Jian-Gang,Li, Wei-Tong,Liu, Zhi-Chao,et al. Record of an oceanic island in the Neo-Tethys Ocean (lowermost Cretaceous Xiazha Formation, Yarlung-Zangbo suture zone, South Tibet)[J],2024,464.
APA	Wang, Jian-Gang,Li, Wei-Tong,Liu, Zhi-Chao,Meng, Zhongyu,&Garzanti, Eduardo.(2024).Record of an oceanic island in the Neo-Tethys Ocean (lowermost Cretaceous Xiazha Formation, Yarlung-Zangbo suture zone, South Tibet).LITHOS,464.
MLA	Wang, Jian-Gang,et al."Record of an oceanic island in the Neo-Tethys Ocean (lowermost Cretaceous Xiazha Formation, Yarlung-Zangbo suture zone, South Tibet)".LITHOS 464(2024).