Rock fluidization during peak-ring formation of large impact structures

Rock fluidization during peak-ring formation of large impact structures
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大型冲击结构峰环形成过程中的岩石流化

DOI:
10.1038/s41586-018-0607-z
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发表时间:
2018
期刊:
影响因子:
64.8
通讯作者:
IODP-ICDP Expedition 364 Science Party
IODP-ICDP Expedition 364 Science Party
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Riller;Poelchau;Schulte;Collins;Melosh;Grieve;Morgan;Gulick;McCall;N. Kring;IODP-ICDP Expedition 364 Science Party

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在太阳系陆地上的大型陨石撞击结构包含明显的地形环,这些环在撞击后几分钟内从隆起的目标(地壳)岩石中出现。为了在长距离内快速流动,这些目标岩石必须大幅削弱,但它们随后恢复了足够的强度来建立和维持地形环。在陨石坑形成过程中,岩石变形的机制在很大程度上是未知的,并且已经争论了几十年。最近对墨西哥直径约200公里的希克苏鲁布撞击构造的钻探,在其峰环岩石中产生了脆性和粘性变形的记录。在这里,我们展示了如何灾难性的岩石削弱后的影响,其次是岩石强度的增加,最终在形成的峰值环在陨石坑。观测结果表明,准连续的岩石流,因此声流化作为主要的物理过程控制初始陨石坑,其次是越来越多的本地化断层。
Large meteorite impact structures on the terrestrial bodies of the Solar System contain pronounced topographic rings, which emerged from uplifted target (crustal) rocks within minutes of impact. To flow rapidly over large distances, these target rocks must have weakened drastically, but they subsequently regained sufficient strength to build and sustain topographic rings. The mechanisms of rock deformation that accomplish such extreme change in mechanical behaviour during cratering are largely unknown and have been debated for decades. Recent drilling of the approximately 200-km-diameter Chicxulub impact structure in Mexico has produced a record of brittle and viscous deformation within its peak-ring rocks. Here we show how catastrophic rock weakening upon impact is followed by an increase in rock strength that culminated in the formation of the peak ring during cratering. The observations point to quasi-continuous rock flow and hence acoustic fluidization as the dominant physical process controlling initial cratering, followed by increasingly localized faulting.
大型撞击坑中的峰环形成:来自希克苏鲁伯的地球物理约束
DOI: --
发表时间: 2000
期刊:
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发表时间: 2011
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DOI: 10.1002/2014je004708
发表时间: 2014-12-01
影响因子: 4.8
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通讯作者: Collins, G. S.
撞击坑过程中的岩脉形成、碎裂流和岩石流化:来自犹他州剧变穹顶结构的示例
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发表时间: 2003
影响因子: 5.3
作者:
T. Kenkmann
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DOI: 10.1016/0019-1035(77)90038-0
发表时间: 1977
期刊: Icarus
影响因子: 3.2
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