Cenozoic sediments of the Tajik basin: sedimentology, provenance, and the tectonic record of the Pamir

塔吉克盆地新生代沉积物：帕米尔高原的沉积学、物源和构造记录

基本信息

批准号：
140904187
负责人：
Professor Dr. Reinhard Gaupp
金额：
--
依托单位：
Institut für Geowissenschaften
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/140904187?language=en
关键词：
Cenozoic sediments Tajik basin sedimentology

项目摘要

The western foreland of the Pamir, the Tajik basin, contains an up to 10 km thick continuous succession of pre- and syn-tectonic units, spanning the Early Cretaceous to the late Neogene; its sediments record the exhumation and the propagation of the thrust-fold systems of the Pamir and the Tien Shan. We investigated sections in the northern, central, and eastern part of the basin with a focus on the active basin margins. Our sedimentologic and provenance studies trace the timing of exhumation of both the Pamir and Tien Shan and the structural and sedimentologic/facies evolution; detailed studies, in particular also in the basin center, are necessary to bring the apparently disparate histories of different parts of the basin together. A further topic will be the provenance of syn-tectonic Neogene deposits, preserved in the Alai valley between the Main Pamir Thrust zone and the Tien Shan fold-thrust belt and in the intra-montane basins of the western Tien Shan. For the latter, we want to clarify whether they were part of the foreland basin of the Pamir or have to be considered as piggy-back basins of the Tien Shan thrust belt. As for the ongoing research within the Tajik basin, we will combine investigations of facies, sediment-geometries, and stacking patterns of syn-tectonic deposits, detailed provenance analysis, including detrital geo-thermochronology of the sediments.

帕米尔高原的西部前陆，即塔吉克盆地，包含厚达10公里的连续的前构造和同构造单元，跨越早白垩世到新近纪晚期；其沉积物记录了帕米尔高原和天山逆冲褶皱系统的折返和扩展。我们调查了盆地北部、中部和东部的剖面，重点关注活跃的盆地边缘。我们的沉积学和物源研究追踪了帕米尔高原和天山的折返时间以及结构和沉积学/相演化；有必要进行详细研究，特别是在盆地中心，以便将盆地不同部分明显不同的历史结合起来。进一步的主题将是同构造新近纪矿床的来源，这些矿床保存在帕米尔主冲断带和天山褶皱冲断带之间的阿莱河谷以及西天山的山内盆地中。对于后者，我们想澄清它们是帕米尔高原前陆盆地的一部分还是必须被视为天山冲断带的背驮式盆地。至于塔吉克盆地正在进行的研究，我们将结合相、沉积物几何形状和同构造沉积物堆积模式的研究，详细的物源分析，包括沉积物的碎屑地热年代学。