Mathematics – Logic
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9913167p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. E6, p. 13167-13179
Mathematics
Logic
5
Australia, Gravity Anomalies, Magnetic Anomalies, Meteorite Craters, Structural Properties (Geology), Three Dimensional Models, Deformation, Geological Surveys, Mathematical Models, Potential Fields, Seismology
Scientific paper
Gravity and seismic reflection data, together with geologic mapping, indicate that the Mount Toondina feature in South Australia is best interpreted as an eroded 4-km-diameter impact structure consisting of a ring structural depression surrounding a pronounced central uplift. Beds at the center of the structure within the central uplift have been raised as much as 200 m from depth and deformed by convergent flow. Seismic reflection data indicate that deformation extends to depths of only approximately = 800 m; at greater depths the reflectors are nearly flat lying, indicating little or no deformation. Gravity data show residual anomalies of +1.0 mGal coincident with the central uplift and a -0.5 Mgal low associated with the ring structural depression. Modeling of the gravity data indicates that relatively high-density material occurs within the central uplift, whereas the ring depression is filled with low-density material. The deformation at Mount Toondina is typical of a complex impact crater; the 4-km diameter is consistent with the expected threshold size for complex craters formed in weak to moderate strength sedimentary rocks.
Plescia Jeffrey B.
Shoemaker Carolyn S.
Shoemaker Eugene M.
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