New Late Cretaceous Paleomagnetic Results From the Eastern Qiangtang Terrane: Implications for the Postcollisional Extrusion and Convergence of the Southeastern Tibetan Plateau

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2024-11-16 DOI:10.1029/2024GL112055

Jiahui Ma, Tianshui Yang, Fei Han, Jiacheng Liang, Xianwei Jiao, Suo Wang, Weiwei Bian, Yiming Ma, Shihong Zhang, Huaichun Wu, Haiyan Li

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Abstract

To refine the postcollisional extrusion and convergence history of the southeastern Tibetan Plateau, we report a quality paleomagnetic data set from Upper Cretaceous redbeds of the eastern Qiangtang Terrane (QT), where is situated at the front edge of eastern Himalayan Syntaxis. The 32 site-mean directions provide a mean pole at 75.4°N, 176.8°E (A₉₅ = 2.4°) and a paleolatitude of 31.8 ± 2.4°N for the Mangkang area. Comparison with reliable Late Cretaceous paleomagnetic data from the eastern QT and East Asia indicates that the eastern QT experienced a southward extrusion of 940 ± 310 km after the Late Cretaceous. Comparing Late Cretaceous paleolatitudes estimated from the eastern QT and Lhasa terrane (LT) reveals a paleolatitude difference of 2,390 ± 620 km. Such a great latitudinal convergence can be attributed to the fact that some continental terranes originally located between the eastern LT and QT were laterally extruded after the Late Cretaceous.

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东羌塘地层晚白垩世古地磁新发现：对青藏高原东南部碰撞后挤压和辐合的影响

为了完善青藏高原东南部碰撞后的挤压和辐合历史，我们报告了位于喜马拉雅山系东部前缘的羌塘地层（QT）东部上白垩世红床的高质量古地磁数据集。32 个地点的平均方向为芒康地区提供了一个平均极点，位于北纬 75.4°，东经 176.8°（A95 = 2.4°），古纬度为北纬 31.8 ± 2.4°。与青藏高原东部和东亚可靠的晚白垩世古地磁数据比较表明，青藏高原东部在晚白垩世后经历了940 ± 310千米的向南挤压。比较东QT和拉萨地层（LT）估计的晚白垩世古纬度，发现两者的古纬度相差2,390 ± 620千米。如此大的纬度趋同可能是由于原本位于东部拉萨阶地和青藏阶地之间的一些大陆阶地在晚白垩世后被侧向挤压所致。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.