Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmns41a1130m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #NS41A-1130
Mathematics
Logic
0925 Magnetic And Electrical Methods (5109), 5420 Impact Phenomena, Cratering (6022, 8136)
Scientific paper
Meteorite impacts are a common occurrence throughout Earth's geological history. Many of the geological signatures of large ancient impacts have been subsequently erased by weathering and erosion processes. It is therefore important to recognize and study preserved meteorite impacts in order to better understand this natural hazard which has been increasingly linked to rapid climate change and mass extinctions. The ca.60 ka Odessa meteorite main crater located in Ector Co. TX. is ca.150 m in diameter. Geological mapping and detailed numerical simulations indicate that the crater was caused by a relatively small, oblique impactor. The crater rim is remarkably well-exposed. Much of the ejecta blanket is present, although deeply eroded. There has been considerable site disturbance due to drilling, shaft excavation, trenching, construction of museum and trails, and oil/gas activity in the surrounding fields. We have performed time-domain electromagnetic and magnetic gradiometer geophysical surveys in order to constrain the subsurface portions of the steeply dipping Cretaceous fossiliferous limestone, marly limestone, and maroon shale formations that comprise the rim. Our data clearly respond to the large-scale deformation and thrusting of these beds in response to the impact. Our geophysical imagery provides a useful constraint on numerical simulations of the impact and its immediate, regional-scale environmental effects.
Everett Mark E.
McGary S.
Soule D.
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