Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.552w&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 552-553
Physics
Core Sampling, Gravimetry, Mapping, Meteorite Craters, Shatter Cones, Texas, Three Dimensional Models, Deformation, Gravity Anomalies, Seismology, Stratigraphy
Scientific paper
The Marquez Dome in northwest Leon County, Texas is a shallow buried complex impact crater. Exposure of Cretaceous sediments in a 1.2 km diameter disturbed zone, surrounded by shallow dipping Tertiary sediments, led early investigators to interpret the structure as the uplift overlying a salt dome. Subsequent drilling and seismic reflection data within the area have ruled out a salt diapiric origin. Gibson and Sharpton and Sharpton and Gibson reinterpreted the disturbed zone as the central uplift of a complex crater. Shatter cones were found associated with the uplift and planar deformation features occur in quartz grains collected at the Marquez Dome. Sharpton and Gibson estimated the age of the structure at 58 m.y., and that age has recently been confirmed by apatite fission-track dating. In an attempt to understand the geometry of the Marquez Dome, we have combined limited surface mapping with available geophysical well logs, and with gravity data that combine a new detailed survey with earlier regional gravity data. Structure maps were constructed by well-log correlation for five stratigraphic horizons that were disrupted by the impact. Subsurface structure maps show decreasing deformation with depth, consistent with an impact origin. From the well-log and gravity data we have constructed a three-dimensional model of the central uplift to a depth of around 2000 m. The predictions of this model, at least for the shallow horizons, will be tested with the completion of two shallow drill holes, sited just off the central uplift and midway to the proposed crater rim. Core will be recovered selectively from both these holes.
Hall Stéphen A.
Reid Michael A.
Sharpton Virgil L.
Wong Alan M.
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