Investigation of the Timing and Strain Magnitude of Late Cretaceous-Tertiary Thrusting in Central and Northern Tibet

[106677] [qh] [qh]目前关于青藏高原形成的各种假说在预测高原应变分布和时间演化方面存在很大差异。如果隆升只涉及少量的上地壳缩短，是被动隆升，则缩短应变应该是小而同步的。如果抬升是由于上地壳增厚加倍的大幅缩短，那么整个高原的应变应该是显著的和历时性的。本项目将尝试评估上地壳变形，从而测试青藏高原演化的这两个模型。研究结果有望为青藏高原的形成方式和时间提供新的约束条件，并使高原隆升的各种机制得以量化。

0106677 Yin & HortonCurrent hypotheses concerning the formation of the Tibetan plateau are widely different in terms of their predicted strain distribution and temporal evolution of the plateau. If the uplift involved little upper crustal shortening and was passively uplifted, shortening strain should be small and synchronous. If the uplift was due to large shortening that doubled the upper crustal thickening, strain should be significant and diachronous across the plateau. This project will attempt to evaluate upper crustal deformation and therefore test these two models for the evolution of the Tibetan plateau. Results are expected to provide new constraints on how and when the Tibetan plateau was constructed and allow various mechanisms for uplifting the plateau to be quantified.