气候变化领域集成服务门户(CCPortal): Pre-Oxfordian (>163 Ma) Ophiolite Obduction in Central Tibet

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DOI	10.1029/2019GL086650
	Pre-Oxfordian (>163 Ma) Ophiolite Obduction in Central Tibet
	Ma A.; Hu X.; Kapp P.; BouDagher-Fadel M.; Lai W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:10
英文摘要	The timing of Bangong-Nujiang suture ophiolite obduction between the Lhasa and Qiangtang terranes in central Tibet is important for understanding the closure history of the Meso-Tethys but remains poorly constrained. We investigated subaerial to shallow marine strata of the Dongqiao Formation that sit unconformably on Bangong-Nujiang suture ophiolites that crystallized in a supra-subduction zone setting at 189–181 Ma. Based on foraminiferal and coral studies, the depositional age of the Dongqiao Formation is constrained to be Oxfordian and Kimmeridgian (Late Jurassic). Provenance analyses including detrital modes, geochemistry of detrital chromian spinels, and U-Pb age populations of detrital zircons suggest the Dongqiao Formation was sourced from uplifted Bangong-Nujiang suture ophiolites and sedimentary and metamorphic rocks of Lhasa terrane affinity to the south. We conclude that Bangong-Nujiang suture ophiolites were obducted soon after crystallization (prior to Oxfordian time; >163 Ma) onto the Lhasa terrane or a microcontinent of Lhasa terrane affinity. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Binary alloys; Metamorphic rocks; Sedimentary rocks; Uranium alloys; Bangong-Nujiang Suture; Detrital chromian spinel; Detrital modes; Detrital zircon; Provenance analysis; Qiangtang terrane; Shallow marine; Subduction zones; Lead alloys; foraminifera; geochemistry; Kimmeridgian; metamorphic rock; obduction; ophiolite; terrane; China; Lhasa Terrane; Xizang; Anthozoa
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170345
作者单位	State Key Laboratory of Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China; Department of Geosciences, University of Arizona, Tucson, AZ, United States; Department of Earth Sciences, University College London, London, United Kingdom
推荐引用方式 GB/T 7714	Ma A.,Hu X.,Kapp P.,et al. Pre-Oxfordian (>163 Ma) Ophiolite Obduction in Central Tibet[J],2020,47(10).
APA	Ma A.,Hu X.,Kapp P.,BouDagher-Fadel M.,&Lai W..(2020).Pre-Oxfordian (>163 Ma) Ophiolite Obduction in Central Tibet.Geophysical Research Letters,47(10).
MLA	Ma A.,et al."Pre-Oxfordian (>163 Ma) Ophiolite Obduction in Central Tibet".Geophysical Research Letters 47.10(2020).