Geological study of the crater rim and the ejecta blanket of the El´gygytgyn impact structure, Siberia

西伯利亚 El´gygytgyn 撞击结构的陨石坑边缘和喷射物层的地质研究

• 批准号: 204519934
• 负责人: Professor Dr. Wolf Uwe Reimold
• 金额: --
• 依托单位: Museum für Naturkunde - Leibniz-Institut für Evolutions- und Biodiversitätsforschung (MfN)
• 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 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/204519934?language=en
• 关键词: Geological; study; crater; rim; ejecta

In 2009 a ca. 500 m long drill core was extracted by ICDP from the El’gygytgyn impact structure. The project had two main purposes: to investigate the sedimentary crater fill for information about the paleoclimatic record for the high Arctic latitudes and to investigate the effect of the impact event on the felsic volcanic target. El’gygytgyn is one of only three terrestrial impact structures known from volcanic areas. Knowledge of impact into volcanics is of particular planetological importance, as planetary bodies such as Mars, Venus, and Mercury are largely covered by volcanic strata. Our group has curated the impactite section of the El’gygytgyn drill core at the Museum of Natural History Berlin. Only a limited record of the regional country rocks exists, with only a part of the crater rim and surrounding ejecta blanket having been geologically explored and sampled. In mid-2011 a joint Alfred-Wegener-Institut (AWI) - Geoforschiungszentrum Potsdam (GFZ) expedition will venture to the remote impact structure, thereby providing a unique opportunity to investigate the geology of the northern and eastern crater rim segments in order to complete the geological map of the crater structure and obtain samples from traverses across stratigraphy in this area. Because of the detailed lithological knowledge (clast population in impactite, nature of the shocked basement) gained from core study hitherto, our group is particularly well prepared to carry out this geological groundwork. Thus, we are applying for a new, independent grant to allow participation in the AWI-GFZ expedition to the crater and for subsequent analysis of a new sample suite

2009年，A。ICDP从El'gygytgyn撞击结构中提取了500米长的岩芯。该项目有两个主要目的：调查火山口沉积物的填充情况，以了解北极高纬度地区的古气候记录;调查撞击事件对长英质火山目标的影响。El'gygytgyn是火山地区已知的仅有的三个陆地撞击结构之一。火山岩撞击的知识在行星学上具有特别重要的意义，因为像火星、金星和水星这样的行星体大部分都被火山岩层覆盖。我们的团队在柏林自然历史博物馆策划了El'gygytgyn岩心的撞击部分。只有有限的区域围岩记录存在，只有一部分火山口边缘和周围的喷出物毯进行了地质勘探和采样。2011年年中，阿尔弗雷德-韦格纳研究所-波茨坦地球物理中心的一次联合考察将冒险前往遥远的撞击结构，从而提供一个独特的机会，调查北方和东部陨石坑边缘部分的地质情况，以完成陨石坑结构的地质图，并从该地区的地层中获取样品。由于迄今为止从岩心研究中获得了详细的岩性知识（撞击岩中的碎屑群、受冲击基底的性质），我们小组特别准备好进行这一地质基础工作。因此，我们正在申请一笔新的独立赠款，以便参加AWI-GFZ对该陨石坑的考察，并随后对一套新的样品进行分析