Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990metic..25..161w&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 25, Sept. 1990, p. 161-165. Research supported by the Australian Research Council, Australian
Physics
9
Ejecta, Hypervelocity Impact, Impact Melts, Meteoritic Microstructures, Spherules, Australia, Grain Size, Silica Glass
Scientific paper
Spherules and irregular shard-like particles consisting of authigenic mineral phases have been identified in the Acraman impact ejecta horizon preserved within the late Proterozoic shales of the Adelaide Geosyncline, South Australia. The spherules (150-micron to 1-mm diameter) range in shape from near-spherical through ellipsoidal to extended ellipsoidal-dumbbell. The distinctive morphology of the spherules and shard-like particles and their restriction to the ejecta horizon, suggest that they were deposited initially as glassy bodies which subsequently have been pseudomorphed by more stable authigenic phases like calcite, quartz, albite, and barite.
Gostin Victor A.
Keays Reid R.
Wallace Malcolm W.
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