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Changes in paleo-erosion rates, and interactions between erosion, deposition and deformation in the Issyk Kul basin, Kyrgyzstan

吉尔吉斯斯坦伊塞克湖盆地古侵蚀速率的变化以及侵蚀、沉积和变形之间的相互作用

基本信息

批准号：
273969534
负责人：
Professor Dr. Stuart Alan Gilder
金额：
--
依托单位：
Sektion Geophysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/273969534?language=en
关键词：
Changes paleo erosion rates interactions

项目摘要

Issyk Kul (literally 'Hot Lake') is a large, presently internally-drained lake in the heart of Central Asia. The structural position between mountain ranges belonging to the Kyrgyz Tien Shan, the Terskey Alatau (up to 5216 m) on the south and the Kungey and Zaili Alatau (up to 4973 m) on the north, explains the abundant accommodation space which has lead to the accumulation of ca. 4 km of strata during the late Cenozoic. The combination of glaciated ranges exceeding 4000m, a deep, presently underfilled basin hosting an ~670m deep lake, geodetic GPS-derived shortening rates of 5 mm/yr between the northern and southern ranges, and active deformation which has propagated into the basin during the past several Ma make this is an ideal location to study relationships between the strong erosional, depositional and tectonic signals in Central Asia. At the same time its position in the path of Westerly moisture transport, outside the monsoon influence, makes Issyk Kul an important target for climatic research. Indeed, the 2011 ICDP Workshop held in Kyrgyzstan noted that deciphering the timing and mechanism of formation of the Issyk Kul basin is important for understanding the evolution of Lake Issyk. This proposal focuses on quantifying how erosion rates have changed over time. Our goals are as follows: (1) Determine depositional ages and paleo-erosion and sediment accumulation rates using cosmogenic nuclide and paleomagnetic methods on stratigraphic sections. (2) Reconstruct paleo-precipitation and -vegetation patterns using stable isotopic analyses from dated stratigraphic sequences. (3) Compile existing well logs from the Issyk Kul basin to quantify basin subsidence as a proxy for the tectonic record of the region. With this combined database, we will be able to address changes in erosion rates over time, the evolution of the lake basin over the million year time scale, and examine interactions between the forces responsible for erosion, deposition, and the migration of deformation within the basin.

伊塞克湖（Issyk Kul，字面意思是“热湖”）是一个位于中亚中心的大型内部排水湖。吉尔吉斯斯坦天山山脉、南部的Terskey Alatau山脉（海拔5216米）和北部的Kungey和Zaili Alatau山脉（海拔4973米）之间的构造位置，解释了丰富的可容纳空间，导致了钙的积累。4公里的地层在晚新生代。冰川范围超过4000米，深，目前欠填充的盆地托管一个~ 670米深的湖泊，大地测量GPS推导的缩短率为5毫米/年之间的北方和南方的范围，并积极变形，已传播到盆地在过去的几个Ma的组合，使这是一个理想的位置，研究强侵蚀，沉积和构造信号之间的关系在中亚。与此同时，它在西风带水汽输送路径上的位置，不受季风影响，使伊塞克湖成为气候研究的重要目标。事实上，2011年在吉尔吉斯斯坦举行的综合社区发展项目讲习班指出，破译伊塞克湖盆地形成的时间和机制对于了解伊塞克湖的演变非常重要。这项建议的重点是量化侵蚀率如何随时间变化。我们的目标如下：（1）在地层剖面上用宇宙成因核素和古地磁方法确定沉积年龄和古侵蚀及沉积物堆积速率。(2)利用稳定同位素分析从年代地层序列重建古降水和植被模式。(3)汇编Issyk Kul盆地的现有测井记录，以量化盆地沉降，作为该地区构造记录的替代。有了这个组合数据库，我们将能够解决侵蚀速率随时间的变化，湖泊盆地在百万年时间尺度上的演变，并检查负责侵蚀，沉积和盆地内变形迁移的力量之间的相互作用。