Tibetan Plateau Formation: tracing material flow around the East-Himalayan syntaxis

青藏高原形成：追踪东喜马拉雅构造结周围的物质流

• 批准号: 68871356
• 负责人: Professor Dr. Erwin Appel
• 金额: --
• 依托单位: Arbeitsgruppe Geophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/68871356?language=en
• 关键词: Tibetan; Plateau; Formation; tracing; material

Critical aspects such as the timing and nature of India-Asia collision and the initiation and evolution of the height and width of the Tibetan Plateau are disputed, untested, or unknown. It has been argued that Miocene to Recent geologic, geodetic, paleomagnetic, geomorphic, and geophysical features of the eastern Plateau are best explained by flow of low-viscosity material within the middle-lower crust; this model contrasts with the classic escape model that calls for large-scale displacement of lithospheric blocks toward SE-Asia. Both models have fundamental implications for crustal rheology, vertical coupling in the lithosphere, and Plateau formation and growth. Here, we test these fundamental models of continental lithosphere deformation by studying the geometry, timing, and magnitude of thermal and mechanical changes and material flow around the E-Himalayan syntaxis (SE-Tibet, W-Yunnan). This interdisciplinary project will integrate, in close cooperation with ITP colleagues, data from geology (structural geometry, kinematics, rheology, depth-temperature-time histories), paleomagne-tism (degree and distribution of crustal block rotation), and remote sensing/tectonic geomorphology (drainage development and river capture reflecting current deformation).

印度与亚洲碰撞的时间和性质以及青藏高原高度和宽度的形成和演变等关键方面存在争议、未经检验或未知。有人认为，中新世至近代东部高原的地质、大地测量、古地磁、地貌和地球物理特征最好是通过中下地壳内低粘度物质的流动来解释的。该模型与经典逃逸模型形成鲜明对比，经典逃逸模型要求岩石圈块向东南亚大规模移动。这两个模型对地壳流变学、岩石圈垂直耦合以及高原的形成和生长都有根本性的影响。在这里，我们通过研究喜马拉雅构造带东部（西藏东南部、云南西部）周围的热力和机械变化以及物质流的几何形状、时间和幅度来测试这些大陆岩石圈变形的基本模型。这个跨学科项目将与 ITP 同事密切合作，整合来自地质学（结构几何、运动学、流变学、深度-温度-时间历史）、古地磁学（地壳块旋转的程度和分布）和遥感/构造地貌学（反映当前变形的排水系统和河流捕获）的数据。

项目成果

Cenozoic clockwise rotation of the Tengchong block, southeastern Tibetan Plateau: A paleomagnetic and geochronologic study

• DOI: 10.1016/j.tecto.2014.04.032
• 发表时间: 2014-07
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: D. Kornfeld;S. Eckert;E. Appel;L. Ratschbacher;Benita-Lisette Sonntag;J. Pfänder;L. Ding;Deliang Liu

Clockwise rotation of the Baoshan Block due to southeastward tectonic escape of Tibetan crust since the Oligocene

• DOI: 10.1093/gji/ggu009
• 发表时间: 2014-04
• 期刊: Geophysical Journal International
• 影响因子: 2.8
• 作者: D. Kornfeld;S. Eckert;E. Appel;L. Ratschbacher;J. Pfänder;Deliang Liu;L. Ding