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Update: Evidence For A Second L Chondrite Impact In The Late Eocene: Preliminary Results From The Wanapitei Crater,.pdf

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Preview of Update: Evidence for a second L chondrite impact in the Late Eocene: Preliminary results from the Wanapitei crater,
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Summary

Evidence suggests a second L chondrite impact occurred in the Late Eocene, with preliminary results from the Wanapitei crater in Canada indicating an L or LL chondrite projectile. The crater's impact melt rocks contain about 1% extraterrestrial component, and Ni/Ir, Ni/Cr, and Co/Cr ratios support an L chondrite origin. The K-Ar age of the impact melt rocks is 37 ± 2 Ma, similar to the ages of the Popigai and Chesapeake Bay craters. The similarity in projectile elemental ratios between Wanapitei and Popigai suggests they share a common origin in the asteroid belt, supporting the hypothesis of a major disruption of the L parent body triggering an asteroid shower in the Late Eocene.

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Evidence suggests a second L chondrite impact occurred in the Late Eocene, with preliminary results from the Wanapitei crater in Canada indicating an L or LL...

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  • File Format: PDF
  • File Size: 319 KB
  • Pages: 2
  • Language: EN
  • Total Downloads: 66
  • Last Updated: 1 month ago

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