Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29t...1c&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 20, pp. 1-1, CiteID 1940, DOI 10.1029/2001GL014382
Physics
3
Planetary Sciences: Physical Properties Of Materials, Planetary Sciences: Impact Phenomena (Includes Cratering), Planetology: Comets And Small Bodies: Impact Phenomena
Scientific paper
The Chicxulub impact launched shocked quartz grains on ballistic trajectories outside the atmosphere, thus enabling their global dissemination. The shocked grains heated up during atmospheric re-entry and the maximum temperature reached was related to their size, velocity and re-entry angle. The extreme heating of some shocked quartz grains is likely to have resulted in the destruction of their planar deformation features (PDFs). A significant negative correlation exists between the palaeodistance from Chicxulub of a given K/T boundary locality and the size of the largest shocked quartz crystal found at that locality. The re-entry annealing process can explain this correlation. The largest shocked quartz grain at a given locality followed the shallowest available trajectory and survived re-entry without being thermally annealed. Larger crystals and those on steeper trajectories exceeded the annealing point and lost their PDFs.
Croskell Michael
Morgan Jo
Warner Mike
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