Long-term crustal deformation in the Pamir: Tertiary continental subduction, crustal bucking, and orocline formation

帕米尔高原的长期地壳变形：第三纪大陆俯冲、地壳弯曲和逆斜形成

• 批准号: 140596706
• 负责人: Professor Dr. Jonas Kley
• 金额: --
• 依托单位: Institut für Geologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/140596706?language=en
• 关键词: Long; term; crustal; deformation; Pamir; Long; term; crustal; deformation; Pamir

We aim to establish the Tertiary deformation of the Pamir–southern Tien Shan on a middle-upper crustal scale, including the first-order structural geometry of intra-continental subduction/crustal buckling, the kinematics of orocline formation, and the modes of tectonic denudation. Our hypothesis is that long-term deformation is concentrated in thick-skinned fold-thrust belts, tracing three continental subduction zones that were partly active contemporaneously; the subduction shortening produced basement domes that stretch across the Pamir and that were later accentuated by orocline formation and indenter rotation. We propose combined structural-geochronologic studies in: (1) the Tajik basin and the intra-montane Alai valley encompassing the southern Tien Shan and the Pamir frontal ranges; (2) the Yazgulem–Muskol–Sares basement domes of the central Pamir; and (3) the Shakhdara dome of the southern Pamir. We will use balanced cross section, stress-field, ductile flow, and kinematic studies together with U/Th/Pb, Ar/Ar, fission-track, and (U-Th)/He geochronology. This project is regionally and methodologically interwoven with the surface-process (CRP3, 5) and the crust/mantle-process aspects (CRP1, 4) of TIPAGE and collaborates with an associated US-project that will provide the petrologic (pressure-temperature) data for the Tertiary deformation history. Its data are pre-requisite to constrain and interpret the long-term geodynamic aspects of numeric modeling in TIPAGE.

我们旨在建立在中层尺度上的帕米尔 - 西南tien shan的第三纪变形，包括围内俯冲/地壳屈曲的一阶结构几何形状，Orcline形成的运动学以及构件剥落的模式。我们的假设是，长期变形集中在厚皮的褶皱带中，追踪了三个连续的俯冲带，这些区域部分是现代的。俯冲缩短产生的基底域名遍布Pamir，后来通过Orocline的形成和凹痕旋转突出。我们提出了：（1）塔吉克盆地和孟买山谷内的结构 - 地形学研究，其中包括南部蒂恩山和帕米尔额叶范围； （2）中央帕米尔的Yazgulem – Muskol -sares地下室； （3）南部帕米尔南部的Shakhdara圆顶。我们将使用平衡的横截面，应力场，延性流量和运动学研究以及U/TH/PB，AR/AR，裂变轨道以及（U-Th）/HE地球人数。该项目在区域和方法上与表面处理（CRP3、5）和尖端的地壳/地幔过程（CRP1、4）之间的交织在一起，并与相关的US-Projects合作，该项目将为第三级变形历史提供质（压力 - 温度）数据。它的数据是约束和解释尖端数字建模的长期地球动力学方面的先决条件。