Seismic investigation of Lake Issyk-Kul sediments - paleoclimatic and tectonic evolution of the lake and its basin

伊塞克湖沉积物的地震调查 - 湖泊及其盆地的古气候和构造演化

• 批准号: 194345370
• 负责人: Dr. Andrea Catalina Gebhardt
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/194345370?language=en
• 关键词: Seismic; investigation; Lake; Issyk; Kul

The planned project is a key contribution to investigations at Lake Issyk-Kul, Central Asia, located in an intramontane basin of the Tien Shan mountains. The lake has formed in a tectonically active region (W-E striking major thrust zones N and S of the lake) and has experienced lake level changes of up to >400 m, which is well documented in two large delta systems at the W and E end of the lake. The lake contains the sediments of the past up to several million years, and has been proposed as a future target for deep drilling within ICDP. Previous seismic surveys by Belgian colleagues were so far only investigated by two master students, and data are not published yet. The seismic profiles shall be reinterpreted, and the study of the delta sequences and their internal structures will result in a refined lake level curve. This will allow to compare the lake's paleoclimate record with other global and regional records, e.g. from the Tarim Basin loesses located south of the Tien Shan mountains. Latest Pleistocene sediments cropping out at the northern and southern shore were interpreted as resulting from earthquakes and point at tectonic activity. Other tectonic features such as faults and folds are quite likely found in the lake sediments and will be mapped in the seismic profiles. This will help to reconstruct the tectonic history of the lake and its basin.

计划中的项目是对位于天山山脉山间盆地的中亚Issyk-Kul湖调查的重要贡献。该湖形成于构造活跃区（北东向北向和南向逆冲带），湖平面变化幅度高达100 ~ 400 m，在湖的西端和东端两个大型三角洲体系中有很好的记录。该湖包含了过去数百万年的沉积物，并已被提议作为ICDP内深层钻探的未来目标。比利时同事之前的地震调查到目前为止只有两位硕士生调查过，数据还没有公布。对地震剖面进行重新解释，对三角洲层序及其内部构造进行研究，得到更精细的湖平面曲线。这将允许将湖泊的古气候记录与其他全球和区域记录进行比较，例如来自天山山脉以南的塔里木盆地黄土。在北岸和南岸出现的最新更新世沉积物被解释为地震造成的，并指向构造活动。其他构造特征，如断层和褶皱，很可能在湖泊沉积物中发现，并将在地震剖面中绘制出来。这将有助于重建湖泊及其盆地的构造历史。