Gravity survey of the Mount Toondina impact structure, South Australia
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Abstract
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 ≈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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Gravity survey of the Mount Toondina impact structure, South Australia |
| Series title | Journal of Geophysical Research E: Planets |
| DOI | 10.1029/94JE00660 |
| Volume | 99 |
| Issue | E6 |
| Year Published | 1994 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | 13 p. |
| First page | 13167 |
| Last page | 13179 |
| Country | Australia |
| State | South Australia |
| City | Oodnadatta |
| Other Geospatial | Mount Toondina |
| Google Analytic Metrics | Metrics page |