Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29s.546w&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 546-547
Computer Science
Melts (Crystal Growth), Meteoritic Composition, Silicates, Tektites, Thailand, Meteor Trails, Meteorite Craters, Remanence, Weathering
Scientific paper
Field searches and interrogation of farmers in Thailand has led to the recovery of layered Australasian tektites in-situ throughout a region extending from the Laotian border westward to a line connecting Ban Pho Klang near the Mekong River in the northeast through Det Udom to Nam Yun in the south. With two exceptions in sites near the western edge of this region, all recovered fragments are layered. The layering of layered tektites appears to have formed by downslope flow. The structures closely resemble layering found in obsidian flows, and the 20 deg dip of the magnetic remanence relative to the layering shows that the glass masses were in-situ on the Earth's surface when they cooled through the Curie temperature. This seems to require that the region was continuously heated by radiation associated with the accretion of extraterrestrial material until the melt had rained out onto the surface; to achieve the observed amount of flow a mean radiation temperature of approximately 2200 K was required. The highly luminous sky was partly produced by fireballs above the parental impact craters, but also by Tunguska-like atmospheric phenomena produced by infalling projectiles that released their entire energy in the atmosphere and left no crater record. We suggest that the investigated region was covered with a melt sheet. A rough estimate is that the mean thickness of the layer was approximately 4 mm, corresponding to a surface density of 10 kg/sq m. An equally rough estimate of the density of tektites that survived weathering and is still present in pristine regions is approximately 30 g/sq m.
Fiske Peter
McHone John F. Jr.
Pitakpaivan Kasana
Puttapiban P.
Salapongse S.
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