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.

中文翻译：

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来自东部羌塘地层的晚白垩世古地磁新结果：对青藏高原东南部碰撞后挤压和收敛的影响


为了完善青藏高原东南部的碰撞后挤压和收敛历史，我们报告了来自东部强塘地层 （QT） 上白垩纪红层的高质量古地磁数据集，该地层位于喜马拉雅东部 Syntaxis 的前缘。32 个站点平均方向为芒康地区提供了 75.4°N、176.8°E （A₉₅ = 2.4°） 和北纬 31.8 ± 2.4°N 的平均极点。与来自东部 QT 和东亚的可靠晚白垩世古地磁数据进行比较表明，东部 QT 在晚白垩世后经历了 940 ± 310 km 的南向挤压。比较从东部 QT 和拉萨地层 （LT） 估计的晚白垩世古纬度，发现古纬度差异为 2,390 ± 620 公里。如此大的纬度收敛可以归因于这样一个事实，即一些最初位于东部 LT 和 QT 之间的大陆地层在晚白垩世之后被横向挤压。