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
(2022) Geophysical Research Letters, volume 49, issue 2, pp. 1 - 12
(Letter)
Abstract
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
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zircon U-Pb ages indicate that the volcanic rocks erupted at ∼227–222 Ma. New paleomagnetic results yield a robust Late Triassic paleopole of 57.6°N, 176.4°E (A95 = 7.8°), corresponding to a paleolatitude of 32.5 ± 7.8°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 ∼227–222 Ma, which suggests that the Paleo-Jinshajiang Ocean in the Qamdo region closed before that time, and likely around ∼230 Ma.
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Keywords: Late Triassic, Paleo-Jinshajiang Ocean, Qamdo, Qiangtang-Tarim Block/Songpan-Ganzi Terrane/Yidun Terrane collision, paleomagnetism, Geophysics, Earth and Planetary Sciences(all)
ISSN: 1944-8007
Publisher: Wiley Online Library
Note: Funding Information: This research was supported by the Second Tibetan Plateau Scientific Expedition Program (Grant 2019QZKK0707), Strategic Priority Research Program of Chinese Academy of Sciences (XDA20070201), the 2020 outstanding members of Youth Innovation Promotion Association, CAS, China (Y202023), the Natural Science Foundation of China (Grants 41988101‐01, 41974080, 42164005), and the State Scholarship Fund, CSC, China (202004910721). Ziqiang Mao, Peiping Song, Zhantao Feng, Deng Zeng, Yongmin Liu, Kang Wu and Shengsheng Chen are thanked for their assistance with the laboratory work and data processing. Publisher Copyright: © 2022. American Geophysical Union. All Rights Reserved.
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