Physics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...233..198g&link_type=abstract
Science (ISSN 0036-8075), vol. 233, July 11, 1986, p. 198-200. Research supported by the ESSO Petroleum Co.
Physics
35
Australia, Ejecta, Geosynclines, Impact Damage, Precambrian Period, Shales, Craters, Hypervelocity Impact, Quartz, Volcanology
Scientific paper
A solitary layer of shattered crustal rock fragments has been traced over a distance of 260 kilometers within folded 600-million-year-old Precambrian marine shales of the Adelaide Geosyncline, South Australia. The fragments consist entirely of acid to intermediate volcanics (approximately 1575 million years old) displaying shattered mineral grains, shock lamellae in quartz, and small shatter cones. Fragments reach 30 centimeters in diameter and show evidence of vertical fall emplacement. Available evidence points to derivation of the rock fragments from a distant hypervelocity impact into the Gawler Range Volcanics at Lake Acraman, approximately 300 kilometers west of the Adelaide Geosyncline.
Compston William
Gostin Victor A.
Haines Peter W.
Jenkins Richard J. F.
Williams Ian S.
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