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

作者：Jiahui Ma, Tianshui Yang, Fei Han, Jiacheng Liang, Xianwei Jiao, Suo Wang, Weiwei Bian, Yiming Ma, Shihong Zhang, Huaichun Wu, Haiyan Li · 发表于：Geophysical Research Letters · 年份：2024 · DOI：10.1029/2024gl112055 · 被引用次数：4 · 研究领域：Geological and Geochemical Analysis、Geomagnetism and Paleomagnetism Studies、Geological and Geophysical Studies

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 (A 95 = 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.