Unmelted impact ejecta associated with the Australian microtektite layer

Details Unmelted impact ejecta associated with the Australian microtektite layer Unmelted impact ejecta associated with the Australian microtektite layer

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1593w&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 593.

Other

Hypervelocity Impact, Ejecta, Tektites, Quartz Crystals, Stratigraphy, Meteoritic Composition, Australia, Indian Ocean, Coesite, Stishovite

Scientific paper

Australasian microtektites have been found in cores from nearly 50 sites in the Indian Ocean, eastern equatorial Pacific, and Philippine, Sulu, and Celebes Seas. We previously reported the discovery of unmelted impact ejecta in the greater than 125-m size fraction of seven cores from the Australasian strewn field. In six of the cores, unmelted impact ejecta were found associated with Australasian microtektites, but in one core unmelted ejecta, with the same stratigraphic age, based on magnetostratigraphy, were found without any associated microtektites. We report here the discovery of unmelted impact ejecta in three additional cores from the Australasian strewn field. The unmelted impact ejecta at one of the new sites (ODP 768) is associated with Australasian microtektites, but at the other two sites (V19-116 and V20-142) it is not. We also determined the abundance of unmelted impact ejecta in the 63-125-m size fraction at two sites (V20-142 and ODP 769A) and we found, as expected, that the unmelted ejecta were three to four times more abundant in this size fraction than in the greater than 125-m size fraction.

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