The Boltysh impact structure: An early Danian impact event during recovery from the K-Pg mass extinction.

The Boltysh impact structure: An early Danian impact event during recovery from the K-Pg mass extinction.
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Boltysh撞击结构:K-Pg大灭绝恢复期间的早期Danian撞击事件。

DOI:
10.1126/sciadv.abe6530
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发表时间:
2021-06
期刊:
影响因子:
13.6
通讯作者:
Jolley DW
Jolley DW
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Pickersgill AE;Mark DF;Lee MR;Kelley SP;Jolley DW

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Boltysh 撞击结构在 K-Pg 边界后形成 0.65 Ma,与下 C29n 高温相一致。希克苏鲁伯 (Chicxulub) 和博尔泰什 (Boltysh) 撞击事件均与 K-Pg 边界相关。虽然希克苏鲁伯事件与白垩纪末期的大规模灭绝有着密切的联系,但直径约 24 公里的博尔泰什撞击事件与这些事件的时间关系尚不确定,尽管人们认为它发生在大规模灭绝之前 2 至 5 ka。在这里,我们对 Boltysh 与 K-Pg 边界进行了首次直接的地质年代学比较。我们的 40Ar/39Ar 年龄为 65.39 ± 0.14/0.16 Ma,表明撞击发生在大灭绝之后约 0.65 Ma。当时,气候正在从希克苏鲁伯撞击和德干圈闭洪水火山活动的影响中恢复。这个年龄表明,Boltysh 与全球沉积物档案和 Boltysh 火山口湖沉积物中记录的下 C29n 高温有密切的时间联系。这种时间上的巧合提出了一种可能性,即即使是很小的撞击事件也可能会破坏地球系统从灾难性事件中的恢复。
The Boltysh impact structure formed 0.65 Ma after the K-Pg boundary, coincident with the Lower C29n hyperthermal. Both the Chicxulub and Boltysh impact events are associated with the K-Pg boundary. While Chicxulub is firmly linked to the end-Cretaceous mass extinction, the temporal relationship of the ~24-km-diameter Boltysh impact to these events is uncertain, although it is thought to have occurred 2 to 5 ka before the mass extinction. Here, we conduct the first direct geochronological comparison of Boltysh to the K-Pg boundary. Our 40Ar/39Ar age of 65.39 ± 0.14/0.16 Ma shows that the impact occurred ~0.65 Ma after the mass extinction. At that time, the climate was recovering from the effects of the Chicxulub impact and Deccan trap flood volcanism. This age shows that Boltysh has a close temporal association with the Lower C29n hyperthermal recorded by global sediment archives and in the Boltysh crater lake sediments. The temporal coincidence raises the possibility that even a small impact event could disrupt recovery of the Earth system from catastrophic events.
DOI: 10.1126/science.208.4448.1095
发表时间: 1980-01-01
期刊: SCIENCE
影响因子: 56.9
作者:
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发表时间: 2008-07-04
期刊: SCIENCE
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发表时间: 1998-01-01
期刊: METEORITES : FLUX WITH TIME AND IMPACT EFFECTS
影响因子: --
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