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Erosion and asymmetric relief evolution of the Central Asian Pamir Plateau

中亚帕米尔高原侵蚀与不对称地貌演化

基本信息

批准号：
213614839
负责人：
Privatdozent Dr. Rasmus C. Thiede
金额：
--
依托单位：
Institute of Earthquake Engineering and Seismology
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/213614839?language=en
关键词：
Erosion asymmetric relief evolution Central

项目摘要

Continental plateaus constitute first-order topographic features of Earth’s surface that set basic patterns of climate, ecology, and even culture. Understanding the processes triggering the evolution of plateaus is fundamental to understand the dynamic link between tectonics, climate, and erosion. However, its relationship remains elusive. I propose to study spatial-temporal variations in the plateau uplift and exhumation of the Central Asian Pamir. I want to test, if plateau evolution is only controlled by tectonic and deep crustal processes triggering uplift, topography and relief evolution, or, alternatively, if long-term erosion gradients have played a first-order role in modifying the plateau evolution by dissecting its western and central sectors. For example, it is unknown if climate-enhanced erosion during Pliocene/Quaternary time has caused the relief asymmetry between the western and central compartments of the Pamir plateau as observed today. I propose an integration of multiple low-temperature thermochronometers, and thermo-kinematic models to test two controversial hypotheses related to plateau evolution. I will test, if asymmetry in topographic relief between the western and central Pamir evolved (1) abruptly as a result of rapid incision over the last ~3 Ma, or, alternatively, (2) continuously since the plateau was initially uplifted sometime between 20 and 10 Ma. With ~30 new zircon and apatite (U-Th-Sm)/He, apatite fission-track cooling ages, respectively, extending over two E-W traverses oriented perpendicular to strong climate gradients, I will constrain the spatial and temporal variations in exhumation over geologic timescales. Thereby 3D thermo-kinematic models will simulate the thermal, structural, and erosional evolution of end-member scenarios that test for different plateau evolution histories.

大陆高原构成了地球表面的一级地形特征，它决定了气候、生态甚至文化的基本模式。了解触发高原演化的过程对于理解构造、气候和侵蚀之间的动态联系至关重要。然而，它们之间的关系仍然难以捉摸。笔者建议对中亚帕米尔高原隆升与发掘的时空变化进行研究。我想测试一下，高原的演化是否仅仅是由构造和深层地壳过程控制的，这些构造和地壳过程触发了隆起、地形和地形的演化，或者，相反，长期的侵蚀梯度是否通过解剖其西部和中部部分，在改变高原演化中发挥了一级作用。例如，尚不清楚上新世/第四纪期间气候增强的侵蚀是否导致了今天观察到的帕米尔高原西部和中部隔室之间的地形不对称。我建议整合多个低温温度计和热运动学模型来测试两个有争议的关于高原演化的假设。我将检验帕米尔高原西部和中部地形起伏的不对称性是(1)由于过去3 Ma的快速切割而突然形成的，还是(2)由于高原最初在20至10 Ma之间的某个时间抬升而持续形成的。利用~30个新的锆石和磷灰石(U-Th-Sm)/He，磷灰石裂变径迹冷却年龄分别延伸到垂直于强气候梯度的两个东西向穿越，我将在地质时间尺度上约束挖掘的时空变化。因此，三维热运动学模型将模拟端元场景的热、结构和侵蚀演化，以测试不同的高原演化历史。