气候变化领域集成服务门户(CCPortal): New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo-Jinshajiang Ocean

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DOI	10.1029/2021GL096902
	New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo-Jinshajiang Ocean
	Yu, Liang; Yan, Maodu; Domeier, Mathew; Guan, Chong; Shen, Miaomiao; Fu, Qiang; Xu, Wanlong; Xu, Zunbo; Niu, Zhichao; Yang, Liye; Shi, Rendeng; Zhang, Weilin; Zan, Jinbo; Zhang, Dawen; Li, Bingshuai
通讯作者	Yan, MD (通讯作者)
发表日期	2022
ISSN	0094-8276
EISSN	1944-8007
卷号	49 期号:2
英文摘要	The tectonic evolution of the Paleo-Jinshajiang Ocean, and in particular the time of its closure, is debated. Here we present new constraints on the evolution of this region from an integrated paleomagnetic and geochronologic study of the Late Triassic Batang Group volcanic rocks in Qamdo, Eastern Qiangtang Terrane (EQT). Two zircon U-Pb ages indicate that the volcanic rocks erupted at similar to 227-222 Ma. New paleomagnetic results yield a robust Late Triassic paleopole of 57.6 degrees N, 176.4 degrees E (A(95) = 7.8 degrees), corresponding to a paleolatitude of 32.5 +/- 7.8 degrees N for the study area. Integrated with other lines of paleomagnetic and geological evidence, we show that the northward drift of the EQT placed it at the same paleolatitude as the Tarim Block by similar to 227-222 Ma, which suggests that the Paleo-Jinshajiang Ocean in the Qamdo region closed before that time, and likely around similar to 230 Ma. Plain Language Summary The closure of the Paleo-Jinshajiang Ocean, which was one of the most important ancient oceans of Asia, closed when the Qiangtang Terrane (QT) collided with the terranes now located to the north of it. However, the evolution of this ocean, and especially the timing of its closure, are still debated. The drift history of the QT is a key to understanding the evolution of the Paleo-Jinshajiang Ocean. We present here new constraints on the evolution of this region from an integrated paleomagnetic and zircon U-Pb geochronologic study of Late Triassic volcanic rocks in Qamdo, Eastern QT. Two zircon U-Pb geochronologic results indicate that the volcanic rocks erupted at similar to 227-222 Ma. New paleomagnetic results yield a robust Late Triassic paleopole of 57.6 degrees N and 176.4 degrees E, and indicate that the study area was then located at a paleolatitude of 32.5 +/- 7.8 degrees N. In integrating these data with other lines of evidence, we show that a northward drift of the EQT since the early Permian brought it to the same paleolatitude as the Tarim Block by similar to 227-222 Ma. This implies that the closure of the Paleo-Jinshajiang Ocean in the Qamdo region occurred before 227-222 Ma, and likely around similar to 230 Ma.
关键词	NORTHERN TIBET IMPLICATIONS ARC/BACK-ARC ASSEMBLAGES PLATE TECTONIC CYCLE GARZE FOLD BELT SUTURE ZONE MESOZOIC CLOSURE VOLCANIC-ROCKS PERMIAN ROCKS TETHYS OROGEN POLAR WANDER
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000751642800062
来源期刊	GEOPHYSICAL RESEARCH LETTERS
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/260745
推荐引用方式 GB/T 7714	Yu, Liang,Yan, Maodu,Domeier, Mathew,et al. New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo-Jinshajiang Ocean[J]. 中国科学院青藏高原研究所,2022,49(2).
APA	Yu, Liang.,Yan, Maodu.,Domeier, Mathew.,Guan, Chong.,Shen, Miaomiao.,...&Li, Bingshuai.(2022).New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo-Jinshajiang Ocean.GEOPHYSICAL RESEARCH LETTERS,49(2).
MLA	Yu, Liang,et al."New Paleomagnetic and Chronological Constraints on the Late Triassic Position of the Eastern Qiangtang Terrane: Implications for the Closure of the Paleo-Jinshajiang Ocean".GEOPHYSICAL RESEARCH LETTERS 49.2(2022).