Three-dimensional geometry and quantification of the sedimentary fill of Lake El'gygytgyn (Chukotka, NE Siberia)

Elgygytgyn 湖（西伯利亚东北部楚科奇卡）沉积物填充物的三维几何和定量

• 批准号: 22136426
• 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: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/22136426?language=en
• 关键词: Three; dimensional; geometry; quantification; sedimentary

An animated three-dimensional model of the lacustrine sediments of Lake El gygytgyn (NE Siberia) will be developed based on approx. 170 km of seismic reflection profiles and approx. 175 km of 3.5 kHz high-resolution profiles. This model will be the first three-dimensional record from the impact crater lake compared to punctual information from cores and to two-dimensional seismic sections. It will allow us to better understand the origin of the asymmetry of the crater and its lake and to better distinguish between sedimentary effects (a) due to the change of basin geometry and (b) due to paleoclimate changes in the future ICDP cores. Furthermore, a detailed correlation between the future ICDP cores will be possible by mapping reflectors between the drillsites. Debris flow occurrence in the lake seems to be driven by paleoclimate changes, i.e. the occurrence is enhanced during periods of warmer climate. A high-resolution three-dimensional model of the upper 40 to 50 m will test this hypothesis and help to establish the debris flows occurrence as paleoclimate indicator. It will further give us a deeper insight into the land-lake interactions and, thus, into the correlation between lake sedimentation, periglacial processes and climate change.

一个动画三维模型的湖泊沉积物的埃尔gygytgyn湖（东北西伯利亚）将开发的基础上约。170公里的地震反射剖面和大约。175公里3.5千赫高分辨率剖面。与岩心的精确信息和二维地震剖面相比，该模型将是第一个来自撞击坑湖的三维记录。它将使我们能够更好地了解火山口及其湖泊的不对称性的起源，并更好地区分沉积效应（a）由于盆地几何形状的变化和（B）由于未来ICDP岩心的古气候变化。此外，通过绘制钻井地点之间的反射层，未来ICDP岩心之间的详细相关性将成为可能。泥石流的发生在湖泊似乎是由古气候变化，即发生在气候变暖的时期增强驱动。一个高分辨率的三维模型的上部40至50米将测试这一假设，并帮助建立泥石流发生的古气候指标。它将进一步使我们更深入地了解陆地-湖泊的相互作用，从而了解湖泊沉积、冰缘过程和气候变化之间的相互关系。