Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..503h&link_type=abstract
Lunar and Planetary Science, volume 27, page 503
Other
1
Impacts, Modeling, Sedimentary Structures, Tsunami
Scientific paper
The late Archean Wittenoom Formation (Hamersley Basin, Western Australia) contains a widespread sedimentary layer containing sand-sized spherules interpreted by Simonson as microkrystites. In the western Hamersley Basin, the spherules form a distinct layer of wave-formed an-orbital ripples with an average length and height of 53 cm and 1 cm. The ripples are the only wave-formed features in Hamersley Basin strata for hundreds of meters strati- graphically and hundreds of kilometers in any direction laterally; they record an exceedingly rare sedimentation event. Since the layer consists almost exclusively of microkrystites, we hypothesize that it was formed by impact-induced tsunami very shortly after initial deposition from the impact, with minimal time for background sediments to accumulate. We have tested this hypothesis through mathematical modeling of both the propagation of impact-generated tsunami into the Hamersley Basin and the sedimentary structures they are capable of producing. To allow this modeling, we have calculated bolide diameter, crater size, and the distance between the target area and the Hamersley Basin using equations developed by other workers. We have also assumed a simple basin model involving impact in the deep ocean and tsunami propagation into the relatively shallow Hamersley Basin. Our results indicate that tsunami were of appropriate height and period to produce the bedforms observed in the Hamersley Basin.
Davies Donald
Hassler S. W.
Robey Harry F.
Simonson B.
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