Geochemical studies of impact breccias and country rocks from the El'gygytgyn impact structure, Russia

Geochemical studies of impact breccias and country rocks from the El'gygytgyn impact structure, Russia
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俄罗斯 Elgygytgyn 撞击构造的撞击角砾岩和围岩的地球化学研究

DOI:
10.1111/maps.12455
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发表时间:
2015
影响因子:
2.2
通讯作者:
Koeberl
Koeberl
中科院分区:
地球科学3区
文献类型:
--
作者:
Raschke;McDonald;Schmitt;Reimold;Koeberl

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俄罗斯东北部El'gygytgyn(年龄3.6 Ma,直径18 km)复杂的撞击构造形成于Ochotsk - Chukotsky火山带(OCVB) ~88 Ma的火山岩靶岩中。2009年,El'gygytgyn成为国际大陆科学钻探计划(ICDP)钻探项目的目标,2011年夏天,俄罗斯-德国探险队对其进行了进一步调查。为了改进这些岩性的微量元素特征记录,并试图检测和限制可能的陨石成分,已经用各种地球化学技术研究了岩心材料和地表样品,包括火山靶岩和撞击物。ICDP岩心的基岩单元反映了在火山口附近占优势的长英质火山岩。覆岩由所有已知目标岩性组成,以长英质岩石为主,但缺乏基于铂族元素丰度的可识别的陨石成分。被湖泊沉积物直接覆盖的重制橄榄岩,不仅震荡矿物和冲击玻璃球相对丰富,而且与其他El'gygytgyn撞击物相比,Os、Ir、Ru和Rh的含量最高。这在较小程度上是镁质成分混合的结果,但更有可能是球粒陨石成分的特征。然而,来自目标材料(类似于ICDP岩心的基性块)的高度亲铁元素对冲击物的贡献仍然很不受限制。
The complex impact structure El'gygytgyn (age 3.6 Ma, diameter 18 km) in northeastern Russia was formed in ~88 Ma old volcanic target rocks of the Ochotsk‐Chukotsky Volcanic Belt (OCVB). In 2009, El'gygytgyn was the target of a drilling project of the International Continental Scientific Drilling Program (ICDP), and in summer 2011 it was investigated further by a Russian–German expedition. Drill core material and surface samples, including volcanic target rocks and impactites, have been investigated by various geochemical techniques in order to improve the record of trace element characteristics for these lithologies and to attempt to detect and constrain a possible meteoritic component. The bedrock units of the ICDP drill core reflect the felsic volcanics that are predominant in the crater vicinity. The overlying suevites comprise a mixture of all currently known target lithologies, dominated by felsic rocks but lacking a discernable meteoritic component based on platinum group element abundances. The reworked suevite, directly overlain by lake sediments, is not only comparatively enriched in shocked minerals and impact glass spherules, but also contains the highest concentrations of Os, Ir, Ru, and Rh compared to other El'gygytgyn impactites. This is—to a lesser extent—the result of admixture of a mafic component, but more likely the signature of a chondritic meteoritic component. However, the highly siderophile element contribution from target material akin to the mafic blocks of the ICDP drill core to the impactites remains poorly constrained.
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DOI: 10.1111/maps.12072
发表时间: 2013
影响因子: 2.2
作者:
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发表时间: 2013
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