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.

Issyk Kul（字面意思是“热湖”）是中亚中心的大型，目前处于内部排水的湖泊。南部的Terskey Alatau（高达5216 m）的山脉之间的结构位置以及北部的Kungey和Zaili Alatau（高达4973 m）的山脉位置，解释了丰富的住宿空间，可导致CA的积累。周末在新生代期间4公里的地层。冰川范围超过4000m，目前填充的盆地的结合，北部和南部范围之间的大约670m的盆地，大约670m的盆地，地球衍生的GPS衍生的缩短速率为5 mm/yr，并且在过去几个MA中繁殖到盆地的积极变形，这是一个理想的位置，以研究较强的位置，并在集中介绍了座位，并依赖于座位的关系。同时，它在季风影响之外的西风水分传输路径中的位置使Issyk Kul成为气候研究的重要目标。的确，在吉尔吉斯斯坦举行的2011年ICDP研讨会指出，破译Issyk Kul Basin形成的时机和机制对于理解Issyk湖的演变非常重要。该提案着重于量化侵蚀率如何随时间变化。我们的目标如下：（1）使用宇宙基因核素和古磁方法确定沉积年龄，古渗透和沉积物的积累速率。（2）使用稳定的同位素分析重建古培养和 - 植被模式。（3）从Issyk Kul盆地编译现有的井日志，以量化盆地沉降作为该地区构造记录的代理。借助此组合的数据库，我们将能够解决随着时间的推移，在百万年度范围内湖流域的演变，并检查负责侵蚀，沉积的力量和盆地内变形的迁移的力量之间的相互作用。