Earth's Impact Events Through Geologic Time: A List of Recommended Ages for Terrestrial Impact Structures and Deposits
Ударные события на Земле в геологическом времени: список рекомендуемых возрастов наземных ударных структур и отложений
2019-12-27
SCID: 54.1/b6zc6zja
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Abstract (AI)
= 46) sourced from the primary literature. High-precision impact ages can be used to (1) reconstruct and quantify the impact flux in the inner Solar System and, in particular, the Earth-Moon system, thereby placing constraints on the delivery of extraterrestrial mass accreted on Earth through geologic time; (2) utilize impact ejecta as event markers in the stratigraphic record and to refine bio- and magneto-stratigraphy; (3) test models and hypotheses of synchronous double or multiple impact events in the terrestrial record; (4) assess the potential link between large impacts, mass extinctions, and diversification events in the biosphere; and (5) constrain the duration of melt sheet crystallization in large impact basins and the lifetime of hydrothermal systems in cooling impact craters, which may have served as habitats for microbial life on the early Earth and, possibly, Mars.
Key Findings
1
High-precision impact ages enable reconstruction and quantification of impact flux in the inner Solar System, especially the Earth–Moon system.
2
Impact ages allow ejecta to serve as stratigraphic event markers and help refine bio- and magneto-stratigraphic correlations.
3
Impact ages constrain melt-sheet crystallization and hydrothermal-system lifetimes, informing assessments of microbial habitats on early Earth and potentially Mars.
4
The age compilation supports testing hypotheses about synchronous multiple impacts and links between impacts, mass extinctions, and biospheric diversification.
5
The paper compiles recommended ages for 46 terrestrial impact structures and deposits from the primary literature.
Research Object
terrestrial impact structures and deposits through geologic time
Research Subject
recommended high-precision impact ages and their use in reconstructing impact flux, stratigraphy, synchronous impacts, biotic events, and post-impact processes
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2019-12-27
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