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

2009年，ICDP从El‘gytgyn撞击结构中提取了一个约500米长的钻芯。该项目有两个主要目的：调查沉积陨石坑填充物，以获得有关北极高纬度古气候记录的信息；调查撞击事件对长英质火山目标的影响。El‘gytgyn是已知的仅有的三个来自火山区的陆地撞击结构之一。由于火星、金星和水星等行星体很大程度上被火山层覆盖，因此有关撞击火山的知识具有特别重要的行星学意义。我们团队在柏林自然历史博物馆策划了El‘gygytgyn钻芯的撞击部分。目前只有有限的区域围岩记录，只有一部分火山口边缘和周围的喷射物毯子进行了地质勘探和取样。2011年年中，阿尔弗雷德-韦格纳研究所(AWI)-波茨坦地质调查局(GFZ)的联合考察队将前往遥远的撞击结构，从而提供一个独特的机会来调查陨石坑边缘北部和东部的地质，以完成陨石坑结构的地质图，并从这一地区的地层导线中获取样本。由于迄今为止从岩心研究中获得了详细的岩性知识(撞击岩中的碎屑数量，震荡基底的性质)，我们小组特别准备好开展这一地质基础工作。因此，我们正在申请一项新的、独立的赠款，以允许参加AWI-GFZ对陨石坑的考察，并随后对新的样品组进行分析。

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