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
复制标题
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
复制
发表时间:
2011
影响因子:
2.2
通讯作者:
Reimold
中科院分区:
文献类型:
--
作者:
Raschke;Schmitt;Reimold
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%.
登录
查看更多内容
DOI:
10.1007/bf01822152
发表时间:
1981-06
期刊:
Geologische Rundschau
影响因子:
--
作者:
R. Schmid
通讯作者:
R. Schmid
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
S. Kelley;R. Spicer;A. Herman
通讯作者:
A. Herman
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
E. Gurov;E. Gurova;R. B. Rakitskaia
通讯作者:
R. B. Rakitskaia
影响因子:
2.2
作者:
Raschke;Reimold;Pittarello;Koeberl
通讯作者:
Koeberl
DOI:
--
发表时间:
1961
期刊:
影响因子:
--
作者:
荒牧 重雄
通讯作者:
荒牧 重雄