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

2009年，ICDP从El 'gygytgyn冲击构造中提取了一个约500米长的钻芯。该项目有两个主要目的：调查沉积陨石坑的填充情况，以获取有关北极高纬度地区古气候记录的信息，并调查撞击事件对长英质火山目标的影响。El 'gygytgyn是已知的三个来自火山地区的陆地撞击结构之一。火山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被火山地层覆盖。我们的团队在柏林自然历史博物馆策划了El 'gygytgyn钻芯的撞击部分。只有有限的区域乡村岩石记录存在，只有一部分火山口边缘和周围的喷出物被地质勘探和取样。2011年中期，阿尔弗雷德-韦格纳研究所（AWI）和波茨坦地质研究中心（GFZ）将联合考察遥远的撞击结构，从而提供一个独特的机会来调查北部和东部陨石坑边缘段的地质情况，以完成陨石坑结构的地质图，并从该地区的地层穿越中获取样本。由于迄今为止从岩心研究中获得了详细的岩性知识（冲击岩体中的碎屑种群，震动基底的性质），我们小组为开展这一地质基础工作做了特别充分的准备。因此，我们正在申请一项新的、独立的拨款，以允许参与AWI-GFZ对陨石坑的考察，并对新的样品组进行后续分析

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