New Paleomagnetic results from Late Triassic limestone of the Eastern Qiangtang Terrane: Implications for the closure of the Paleo-Jinshajiang Ocean

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2024-11-16 DOI:10.1016/j.palaeo.2024.112610

Liang Yu , Maodu Yan , Mathew Domeier , Bingshuai Li , Miaomiao Shen , Chong Guan , Qiang Fu , Wanlong Xu , Zunbo Xu , Zhichao Niu , Dawen Zhang , Liye Yang

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Abstract

To constrain the drift history of the Eastern Qiangtang Terrane and the closure time of the Paleo-Jinshajiang Ocean, we conducted a paleomagnetic study of Late Triassic limestones in the Qamdo region of the Eastern Qiangtang Terrane. The results of the rock magnetic, petrographic, and reversal test indicate the limestones carry primary magnetizations. Our new paleomagnetic data provide a Late Triassic paleopole of 30.9°N, 161.4°E (A₉₅ = 8.4°), which corresponds to a paleolatitude of 35 ± 8.4°N for the study area. Integrating these data with existing paleomagnetic results and geological evidence, we determine that the Eastern Qiangtang Terrane was situated at a relatively constant paleolatitudinal position without significant N-S displacements during ∼230–209 Ma. We conclude that the Paleo-Jinshajiang Ocean in the Qamdo region had already closed before ∼221 Ma, and likely around ∼230 Ma.

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东羌塘地层晚三叠世石灰岩的古地磁新发现：对古金沙江洋关闭的影响

为推测东羌塘地层的漂移历史和古金沙江洋的闭合时间，我们对东羌塘地层昌都地区的晚三叠世灰岩进行了古地磁研究。岩磁、岩相和反转测试结果表明，这些灰岩带有原生磁性。我们新的古地磁数据提供了北纬 30.9°，东经 161.4°（A95 = 8.4°）的晚三叠世古极点，相当于研究区域的北纬 35 ± 8.4°。将这些数据与现有的古地磁结果和地质证据相结合，我们确定东羌塘地层在∼230-209Ma期间位于一个相对恒定的古纬度位置，没有明显的南北位移。我们的结论是，昌都地区的古金沙江洋在∼221Ma之前，很可能在∼230Ma左右已经关闭。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.