Computer Science
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.340..542g&link_type=abstract
Nature (ISSN 0028-0836), vol. 340, Aug. 17, 1989, p. 542-544. Research supported by the Australian Research Council, Australian
Computer Science
23
Earth, Craters, Impacts, Iridium, Anomalies, Sediments, Concentrations, Cretaceous-Tertiary Event, Lake Acraman, Australia, Ejecta, Meteorites, Samples, Terrestrial, Layers, Stratigraphy, Formation, Origin, Source
Scientific paper
Data from the Acraman impact ejecta horizon, South Australia, are presented which conclusively links high sedimentary iridium concentrations to a major meteoroid-impact structure and its widely dispersed ejecta. An Ir anomaly is present within the ejecta from the Acraman impact event preserved in late Precambrian shales within the Adelaide Geosyncline. The highest Ir concentrations within the ejecta are associated with the coarser-grained clasts of acid volcanics, suggesting that most of the Ir is carried by these fragments. The target rocks at the impact site are comparable acid volcanics that have very low Ir, Au, Pt, Pd, Ru, and Cr concentrations, indicating a meteoritic origin for the anomalous Ir levels within the ejecta.
Gostin Victor A.
Keays Reid R.
Wallace Malcolm W.
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