Journal article

The Acraman asteroid impact, South Australia: magnitude and implications for the late Vendian environment

GE Williams, MW Wallace

JOURNAL OF THE GEOLOGICAL SOCIETY | GEOLOGICAL SOC PUBL HOUSE | Published : 2003

Abstract

Acraman, located in the 1.59 Ga Gawler Range Volcanics on the Gawler Craton, South Australia, is a complex impact structure that is now eroded ≥2.5 km below the original crater floor. The geology, geomorphology, apatite fission-track geochronology, and geophysical signature of Acraman suggest that the original crater comprised highly disturbed rocks of a central uplift, a transient cavity up to c. 40 km in diameter, and a possible final structural rim at 85-90 km diameter. Radial unfolded distance from the centre of Acraman, versus decompacted thickness for the Acraman ejecta horizon identified in late Vendian (c. 580 Ma) mudstone in the Adelaide fold belt, Torrens Hinge Zone and Officer Bas..

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