The 2011 expedition to the El'gygytgyn impact structure, Northeast Russia: Toward a new geological map for the crater area

The 2011 expedition to the El'gygytgyn impact structure, Northeast Russia: Toward a new geological map for the crater area
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2011 年俄罗斯东北部 Elgygytgyn 撞击构造探险:绘制陨石坑区域的新地质图

DOI:
10.1111/maps.12306
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发表时间:
2011
影响因子:
2.2
通讯作者:
Reimold
Reimold
中科院分区:
地球科学3区
文献类型:
--
作者:
Raschke;Schmitt;Reimold

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El‘gytgyn是一个3.6 Ma、直径18公里的撞击坑,形成于西伯利亚东北部一个大约88 Ma的古老火山目标上。该结构是ICDP最近一个钻井项目的主题。在这些努力的同时,2011年夏天,俄罗斯和德国进行了一次探险,调查了南部和东部火山口边缘的永久冻土、湖泊梯田和火山岩。这为绘制和采样这一复杂撞击结构周围的火山目标岩石提供了独特的机会。采集了43个露头样品,进行了岩石学和地球化学分析。这些结果与早先的测绘结果相结合,以1:50,000的比例绘制了这一撞击结构及其邻近地区的新地质图。我们的岩套的成分与2009年ICDP钻芯的岩性进行了比较。被描述为ICDP钻芯下部基岩的褐沸石,在岩石学和化学成分上与地表观察到的流纹岩和流纹质褐辉岩有很大的相似之处。ICDP钻芯中暴露的硫化物层序是所有观察到的目标岩在该地区各自比例的混合物。与以往的研究不同,El‘gytgyn计算的平均目标成分考虑了基性目标岩的贡献:镁铁质和中间岩约占7.5%,长英质岩约占92.5%。
El'gygytgyn is a 3.6 Ma, 18 km diameter, impact crater formed in an approximately 88 Ma old volcanic target in Northeast Siberia. The structure has been the subject of a recent ICDP drilling project. In parallel to those efforts, a Russian‐German expedition was undertaken in summer 2011 to investigate the permafrost soil, lake terraces, and the volcanic rocks of the southern and eastern crater rim. This provided the unique opportunity for mapping and sampling of the volcanic target rocks around a large part of this complex impact structure. Samples from 43 outcrops were collected and analyzed petrographically and geochemically. The results were combined with earlier mapping outcomes to create a new geological map of this impact structure and its immediate environs, at the scale of 1:50,000. Compositions of our rock suites are compared with the lithologies of the 2009 ICDP drill core. The ignimbrite described as lower bedrock in the ICDP drill core shows petrographically and chemically strong similarities to the rhyolitic and rhyodacitic ignimbrites observed on surface. The suevite sequence exposed in the ICDP drill core is a mixture of all observed target rocks at their respective proportions in the area. In contrast to previous studies, the calculated average target composition of El'gygytgyn takes the contribution of the basic target rocks into consideration: mafic and intermediate rocks approximately 7.5%, and felsic rocks approximately 92.5%.
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