气候变化领域集成服务门户(CCPortal): Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision

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DOI	10.1016/j.tecto.2019.228311
	Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision
	Chen, Yaofei; Ding, Lin; Li, Zhenyu; Laskowski, Andrew K.; Li, Jinxiang; Baral, Upendra; Qasim, Muhammad; Yue, Yahui
通讯作者	Chen, YF (通讯作者)
发表日期	2020
ISSN	0040-1951
EISSN	1879-3266
卷号	775
英文摘要	Mesozoic strata along northern margin of the Lhasa terrane near Dingqing, Tibet provide a semi-continuous record of the Bangong-Nujiang Ocean closure and the subsequent Lhasa-Qiangtang collision. In this study, we present results of sandstone petrographic, detrital zircon U similar to Pb, and Cr-spinel geochemical data to determine the provenance of the Mesozoic strata (from the Triassic Quehala Group and the Mid-Jurassic to Lower Cretaceous Xihu, Lagongtang, and Duoni Formations, which are young from similar to 220 Ma to similar to 100 Ma) in this region, thereby allowing for interpretation of their tectonic setting. The similar 1200-900 age cluster from the lower Xihu Formation to that of the Triassic Quehala Group and the distinct age peaks at similar to 200 Ma and similar to 146 Ma from the upper Xihu Formation suggest a Lhasa terrane provenance to the south. Distinctive age clusters of 300-210 Ma and similar to 1800 Ma and Cr-spinel composition analysis of the Lagongtang Formation indicate a provenance shift from the Lhasa terrane to the Qiangtang terrane and the Bangong-Nujiang suture zone to the north. The Lagongtang Formation was deposited in a bathyal-abyssal to shallow-slope environment from north to south, that we interpret as the foredeep depozone and distal foredeep of a peripheral foreland basin system that developed due to flexural subsidence related to the Lhasa-Qiangtang collision and terrane accretion. The age of the Lhasa-Qiangtang collision is constrained by a similar to 140 Ma tuffite U-Pb age at the base of the foreland basin strata. An angular unconformity between the Xihu and Lagongtang Formation, which we interpret as the result of the Lhasa-Qiangtang collision. Our results indicate that the Lhasa-Qiangtang collision initiated around similar to 140 Ma in the Dingqing region, simultaneously with previous determinations 1200 km to the west near Gaize area. Therefore, we prefer quasi-simultaneous onset of collision along-strike to zippering collision models wherein the east collision age is older than the west.
关键词	ZIRCON U-PB NUJIANG TETHYAN OCEAN INDIA-ASIA COLLISION TECTONIC EVOLUTION SUTURE ZONE ISOTOPIC GEOCHEMISTRY MELT INCLUSIONS SOUTHERN TIBET CONSTRAINTS ROCKS
英文关键词	Tibetan Plateau; Bangong-Nujiang suture zone; Lhasa-Qiangtang collision; Foreland basin; Provenance analysis; Collisional tectonics
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000515211300008
来源期刊	TECTONOPHYSICS
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/259937
推荐引用方式 GB/T 7714	Chen, Yaofei,Ding, Lin,Li, Zhenyu,et al. Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision[J]. 中国科学院青藏高原研究所,2020,775.
APA	Chen, Yaofei.,Ding, Lin.,Li, Zhenyu.,Laskowski, Andrew K..,Li, Jinxiang.,...&Yue, Yahui.(2020).Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision.TECTONOPHYSICS,775.
MLA	Chen, Yaofei,et al."Provenance analysis of Cretaceous peripheral foreland basin in central Tibet: Implications to precise timing on the initial Lhasa-Qiangtang collision".TECTONOPHYSICS 775(2020).