Lake Issyk Kul: Neotectonic deformation of (paleo-) shorelines and their link with intermontane basin closure and lake-level fluctuations

吉尔吉斯斯坦北方的伊塞克湖是一个潜在的ICDP钻探点，可以研究中亚过去几百万年的气候和侵蚀历史。该建议的重点是破译湖泊集水区景观中包含的构造信号及其对湖泊沉积过程的影响。关键要素是横跨伊塞克湖的古海岸线。海岸线和湖泊沉积物提供了充足的证据，主要湖泊水位波动在第四纪，并帮助确定与其他盆地和溢出条件，这是至关重要的正确评估不断变化的环境条件在湖盆的瞬时河流连通。重大历史地震、构造变形地貌、古地震学证据和大量的物质运动表明，气候本身并不是湖泊动态变化的唯一驱动力，这使得该盆地成为了解相关构造沉积过程的理想地点。我的目标是量化海岸线变形遥感和地面激光雷达扫描，伴随着相关的标记层的年代测定。重要的是，我将专注于事件和机制负责盆地关闭和湖泊系统的河流连通性的变化，记录在西部湖泊出口的地层和地貌。这些数据将有助于更好地了解湖泊的第四纪演变，并对解释拟从ICDP岩心中获得的记录至关重要。

Lake Issyk Kul in northern Kyrgyzstan is a potential ICDP drilling site to examine the climatic and erosional history of Central Asia over the past few Myr. This proposal focuses on deciphering the tectonic signals contained in the landscape of the lake catchments and their influence on lacustrine sedimentary processes. Key elements are paleo-shorelines straddling Lake Issyk Kul. Shorelines and lacustrine deposits furnish ample evidence for major lake-level fluctuations during the Quaternary, and help identify transient fluvial connectivity with other basins and overflow conditions, which are paramount for correctly assessing changing environmental conditions in the lake basin. Major historic earthquakes, tectonically deformed landforms, paleoseismological evidence, and voluminous mass movements indicate that climate alone is not the only driver for changes in lake dynamics, making this basin an ideal location to understand linked tectono-sedimentary processes. I aim to quantify shoreline deformation by remote sensing and terrestrial LiDAR-scanning, accompanied by dating of associated marker horizons. Importantly, I will focus on events and mechanisms responsible for basin closure and changes in fluvial connectivity of the lake system, recorded in the stratigraphy and geomorphology of the western lake outlet. These data will help to better understand the Quaternary evolution of the lake and are crucial to interpret the record to be obtained from the proposed ICDP drill core.