气候变化领域集成服务门户(CCPortal): Provenance of early Paleozoic sedimentary rocks in the Altyn Tagh orogen: Insights into the paleoposition of the Tarim craton in northern Gondwana associated with final closure of the Proto

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DOI	10.1130/B35576.1
	Provenance of early Paleozoic sedimentary rocks in the Altyn Tagh orogen: Insights into the paleoposition of the Tarim craton in northern Gondwana associated with final closure of the Proto–Tethys Ocean
	Liu Q.; Zhao G.; Li J.; Yao J.; Han Y.; Wang P.; Tsunogae T.
发表日期	2021
ISSN	167606
起始页码	505
结束页码	522
卷号	133 期号:2021-03-04
英文摘要	The evolution of the northern margin of Gondwana, especially to the north of India and Australia, remains enigmatic. Much controversy concerns when and where the Tarim craton was amalgamated with northern Gondwana due to final closure of the North and South Altyn Oceans (two branches of the Proto–Tethys Ocean between south-eastern Tarim and northern Gondwana). This study addressed these issues through systematic field-based zircon U-Pb dating and Hf-isotope analyses of early Paleozoic sedimentary rocks in the Altyn Tagh orogen. New dating results reveal depositional ages from ca. 494 to 426 Ma. Provenance tracing indicates the ca. 494–477 Ma samples were dominantly sourced from local Altyn Tagh areas to the south of the North Altyn Ocean, whereas the ca. 465–449 Ma samples are characterized by a significant increase in ca. 2.7–2.4 Ga, 2.0–1.7 Ga, and 840–780 Ma de-trital zircons, indicating an augmented supply of detritus from the Tarim craton to the north of the North Altyn Ocean. This change indicates a major provenance shift from a single to multiple source regions between ca. 477 and 465 Ma, marking the timing of the final closure of the North Altyn Ocean. Zircon U-Pb and Hf-isotopic data from the ca. 444–426 Ma samples resemble those from the ca. 465–449 Ma samples, suggesting local sediment recycling related to a postcollisional regime. Considering the South Altyn Ocean and other branches of the Proto–Tethys Ocean, we infer that the entire Proto– Tethys Ocean might have been progressively closed at ca. 500–420 Ma, leading to the amalgamation of most East Asian blocks with northern Gondwana. Detrital zircon U-Pb and Hf-isotope comparisons indicate that Tarim shared a North Indian affinity with many East Asian terranes (such as North Qilian, North Qinling, South China, Indochina, South Qiangtang, etc.), rather than with Arabia-Iran or other terranes (e.g., Lhasa and Sibumasu) that were adjacent to western Qian Liu http://orcid.org/0000-0003-3506-180X © 2021
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184697
作者单位	International Research Fellow of Japan Society for the Promotion of Science, Chiyoda-ku, Tokyo 102-0083, Japan; Graduate School of Life and Environmental Sciences, The University of Tsukuba, Ibaraki, 305-8572, Japan; Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China; Department of Geology, Northwest University, Xi’an, 710069, China; China Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China; Department of Geology, University of Johannesburg, Auckland Park, 2006, South Africa
推荐引用方式 GB/T 7714	Liu Q.,Zhao G.,Li J.,等. Provenance of early Paleozoic sedimentary rocks in the Altyn Tagh orogen: Insights into the paleoposition of the Tarim craton in northern Gondwana associated with final closure of the Proto–Tethys Ocean[J],2021,133(2021-03-04).
APA	Liu Q..,Zhao G..,Li J..,Yao J..,Han Y..,...&Tsunogae T..(2021).Provenance of early Paleozoic sedimentary rocks in the Altyn Tagh orogen: Insights into the paleoposition of the Tarim craton in northern Gondwana associated with final closure of the Proto–Tethys Ocean.Bulletin of the Geological Society of America,133(2021-03-04).
MLA	Liu Q.,et al."Provenance of early Paleozoic sedimentary rocks in the Altyn Tagh orogen: Insights into the paleoposition of the Tarim craton in northern Gondwana associated with final closure of the Proto–Tethys Ocean".Bulletin of the Geological Society of America 133.2021-03-04(2021).