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

西藏中北部晚白垩世-第三纪逆冲作用的时代及应变大小探讨

• 批准号: 0106677
• 负责人: An Yin
• 金额: $ 24.85万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0106677&HistoricalAwards=false
• 关键词: Investigation; Timing; Strain; Magnitude; Late

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.

关于青藏高原形成的电流假说在其预测的应变分布和高原的时间演化方面存在很大差异。 如果隆升不涉及上地壳缩短，且为被动隆升，则缩短应变应较小且同步。 如果隆升是由于上地壳增厚加倍的大幅度缩短造成的，那么应变应该是显著的，并且贯穿整个高原。 该项目将试图评估上地壳变形，从而检验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机制提供新的约束条件，并对高原隆升的各种机制进行量化。