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New records of Ediacaran Acraman ejecta in drillholes from the Stuart Shelf and Officer Basin, South Australia

AutorHill, Andrew C.; Haines, Peter W.; Grey, Kathleen; Willman, Sebastian
Palabras claveAcraman
Impact crater
Impact ejecta
Petrography
Fecha de publicaciónnov-2007
EditorUniversity of Arizona
CitaciónMeteoritics & Planetary Science 42(11): 1883-1891 (2007)
ResumenNew occurrences of the Acraman impact ejecta layer were recently discovered in two South Australian drillholes, SCYW-79 1a (Stuart Shelf) and Munta 1 (Officer Basin) using lithostratigraphy, acritarch biostratigraphy, carbon isotope stratigraphy, and biomarker anomalies to predict the stratigraphic position. The ejecta layer is conspicuous because it consists of pink, sandsized, angular fragments of volcanic rock distributed along the bedding plane surface of green marine siltstone. In SCYW-79 1a it forms a layer 5 mm thick; in Munta 1 the ejecta layer is thin and discontinuous because of its distance (~550 km) from the impact structure. Palynological, biomarker, and carbon isotope anomalies can now be shown to coincide with the ejecta layer in SCYW-79 1a and Munta 1 suggesting the Acraman impact event may have had far reaching influences on the rapidly evolving Ediacaran biological and geochemical cycles.
Descripción9 pages, 8 figures.-- ISI Article Identifier: 000253937700004.
Versión del editorhttp://digitalcommons.library.arizona.edu/holdings/journal/issue?r=uadc://azu_maps/Volume42/Number11/
URIhttp://hdl.handle.net/10261/13008
ISSN1086-9379
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