气候变化领域集成服务门户(CCPortal): Geochemistry and zircon geochronology of the Late Triassic volcanic- sedimentary successions in northern Tibet: Implications for the provenance and tectonic evolution of the Mesozoic Qiangtang Basin

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DOI	10.1016/j.gr.2023.02.005
	Geochemistry and zircon geochronology of the Late Triassic volcanic- sedimentary successions in northern Tibet: Implications for the provenance and tectonic evolution of the Mesozoic Qiangtang Basin
	Wang, Zhongwei; Zhan, Wangzhong; Wang, Jian; Peng, Qinghua; Wei, Wei; Wang, Duo; Ma, Qilin; Song, Chunyan; Feng, Xinglei
发表日期	2023
ISSN	1342-937X
EISSN	1878-0571
起始页码	321
结束页码	343
卷号	117
英文摘要	The Late Triassic volcanic-sedimentary successions deposited in the Qiangtang Basin are linked with the initiation of the Mesozoic Qiangtang Basin. However, the nature of this basin is hotly debated. Here, we synthesize petrographic, mineralogical, geochemical, and detrital zircon U-Pb age data of these volcanic- sedimentary successions to constrain their chemical weathering history, provenance, and tectonic setting and to reconstruct the tectonic evolution of the Mesozoic Qiangtang Basin. The chemical weathering indices, especially the chemical index of alteration (CIA), are controlled by grain size and hydraulic sort -ing rather than sediment recycling. Low compositional and textural maturities, high index of composi-tional variation (ICV) values, and low CIA and plagioclase index of alteration (PIA) values in most samples suggest that the sediments from the Fanghu and north Woruoshan sections are predominantly from low-maturity sources that may have experienced a weak chemical weathering history. Based on provenance-sensitive geochemical indices (La/Th versus Hf, La/Sc versus Co/Th, and Sc/Th versus Cr/ Th) and petrographic features, the detrital contributions to the Nadi Kangri Formation siliciclastic rocks are predominantly proximal felsic rocks. Detrital zircon age spectra suggest that the Nadi Kangri Formation siliciclastic rocks exhibit a provenance change from the Fanghu to the well QK-1 area, although all of the rocks were derived from the Qiangtang terrane itself. The Fanghu section was primar-ily sourced from synchronous magmatic rocks and pre-Triassic strata from the North Qiangtang and Central uplift belt, while well QK-1 was primarily sourced from recycled sediments from the South Qiangtang and Central uplift belt. Therefore, we propose that the Nadi Kangri Formation volcanic-sedi-mentary successions were deposited in a rift basin and that its evolution was likely related to the inter-action of the rapid expansion of the Meso-Tethys Oceanic crust, collapse of the collisional orogen, and rollback of the Jinsha Paleo-Tethys subducting slab during the Late Triassic.(c) 2023 Published by Elsevier B.V. on behalf of International Association for Gondwana Research.
关键词	Chemical weathering Provenance and tectonic setting Geochemistry Detrital zircon Nadi Kangri formation
英文关键词	U-PB AGES; SOUTHERN QIANGTANG; HF ISOTOPES; SILICICLASTIC SEDIMENTS; SETTING DISCRIMINATION; PLATEAU IMPLICATIONS; CRUSTAL EVOLUTION; METAMORPHIC ROCKS; DETRITAL ZIRCONS; WESTERN CHINA
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000949989800001
来源期刊	GONDWANA RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283573
作者单位	Southwest Petroleum University; Southwest Petroleum University; Southwest Petroleum University; China Geological Survey; Chengdu Center, China Geological Survey; China Geological Survey; China National Petroleum Corporation; China National Petroleum Corporation; Sinopec
推荐引用方式 GB/T 7714	Wang, Zhongwei,Zhan, Wangzhong,Wang, Jian,et al. Geochemistry and zircon geochronology of the Late Triassic volcanic- sedimentary successions in northern Tibet: Implications for the provenance and tectonic evolution of the Mesozoic Qiangtang Basin[J],2023,117.
APA	Wang, Zhongwei.,Zhan, Wangzhong.,Wang, Jian.,Peng, Qinghua.,Wei, Wei.,...&Feng, Xinglei.(2023).Geochemistry and zircon geochronology of the Late Triassic volcanic- sedimentary successions in northern Tibet: Implications for the provenance and tectonic evolution of the Mesozoic Qiangtang Basin.GONDWANA RESEARCH,117.
MLA	Wang, Zhongwei,et al."Geochemistry and zircon geochronology of the Late Triassic volcanic- sedimentary successions in northern Tibet: Implications for the provenance and tectonic evolution of the Mesozoic Qiangtang Basin".GONDWANA RESEARCH 117(2023).