Field recovery of layered tektites in northeast Thailand

Details Field recovery of layered tektites in northeast Thailand Field recovery of layered tektites in northeast Thailand

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10014383w&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue E7, p. 14383-14390

Physics

8

Planetology: Solar System Objects: Meteorites And Tektites, Planetology: Comets And Small Bodies: Impact Phenomena, Planetology: Solid Surface Planets: Impact Phenomena (Includes Cratering), Global Change: Impact Phenomena

Scientific paper

We recovered Australasian tektites in place throughout a 40×130 km region in northeast Thailand extending from the Laotian border westward to a line connecting Na Pho Klang 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 fragments are layered (muong-Nong-type) tektites. It appears that large layered tektites are mainly found by rice farmers in fields that were forested until the recent past. The presence of layered tektites in this 40×130 km area implies that impact melt that fell in these areas was not enough to flow if it was deposited on a sloping surface. The absence of splash-form tektites from the region indicates that the layer was still molten when masses having shapes (teardrops, dumbbells, etc.) produced by spinning reached the ground. To account for this and to allow time for the melt to flow a few tens of centimeters requires that the atmosphere remained hot (>2300 K) for a few minutes. Tektites that are in place are almost always associated with a wide-spread 10-cm to meter-thick layer of laterite. In two cases (one involving layered, one involving splash-form tektites), where accurate stratigraphic control demonstrated that the tektites were still in section, they were sited on top of the laterite layer just below a layer of aeolian sand.

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