Meteorite Impacts

The following books can be viewed or downloaded from GeoDocs

Record 2001/6
GSWA Woodleigh 1, 2, and 2A well completion report, Woodleigh impact structure, Southern Carnarvon Basin, Western Australia
by A. J. MORY, F. PIRAJNO, A. Y. GLIKSON, and J. COKER
Book, 2 plates, and CD: $22.00

Report 79
The geophysical interpretation of the Woodleigh impact structure, Southern Carnarvon Basin, Western Australia
by R. P. IASKY, A. J. MORY, and K. A. BLUNDELL
Book (2001), and plate on CD: $44.00
Summary: At an estimated diameter of 120 km, the multi-ring Woodleigh impact structure is arguably the largest proven impact structure in Australia and the fourth largest on Earth. Centred about 50 km east of Hamelin Pool in Shark Bay, Western Australia, the impact structure is best shown by gravity, seismic, and magnetic data because it is buried beneath up to 600 m of Jurassic–Tertiary strata. Regional stratigraphy constrains the age of impact between the Middle Devonian and Early Jurassic. This Report focuses on the interpretation of the gravity, seismic, and magnetic data to determine the morphology of the structure. Concentric gravity highs and lows within the structure correspond to troughs and ridges on seismic data. As in other impact structures, the most intense deformation is in the inner third of the structure with only minor deformation to the outer rim. The outer limit of the structure is shown by the abrupt truncation of the northerly trending Wandagee and Ajana Ridges, an arcuate magnetic anomaly to the east, and minor drainage features.

Record 2003/6
Interpretation of geophysical data over the Shoemaker impact structure, Earaheedy Basin, Western Australia
by P. J. HAWKE

Report 82
Geology of the Shoemaker impact structure, Western Australia
by F. PIRAJNO
Book (2002) and map: $44.00
Summary: The Shoemaker impact structure is about 110 km northeast of Wiluna, on the southern margin of the Palaeoproterozoic Earaheedy Basin. The structure is about 30 km in diameter, deeply eroded, and consists of a ring syncline and a ring anticline with a core of Archaean granite–greenstone rocks that is interpreted as the central uplift. The structure is well defined by circular aeromagnetic anomalies and a negative Bouguer gravity anomaly coincident with the central uplift. The geophysical data also suggest that the original diameter of the structure could have been 45–50 km. The age of the Shoemaker structure is not well constrained, but dating of the Teague Granite in the central uplift indicates a maximum age of c. 1300 Ma (Ar–Ar) and a minimum age of c. 568 Ma (K–Ar). Shock metamorphic features include shatter cones and planar deformation features in quartz crystals. Rocks on the eastern rim of the structure exhibit pervasive to nonpervasive hydrothermal alteration, such as quartz veining and silicification. 

Record 2003/10
Geophysical investigation of the Wolfe Creek Meteorite Crater
by P. J. HAWKE

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