Mathematics – Logic
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..411h&link_type=abstract
Meteoritics, vol. 29, no. 3, p. 411-416
Mathematics
Logic
11
Chemical Composition, Geomorphology, Glass, Meteorite Craters, Meteoritic Composition, Mineralogy, Tektites, Cambodia, Geochronology, Hypotheses, Lakes, Neutron Activation Analysis, Rocks, Spatial Distribution, Structural Basins, Tables (Data)
Scientific paper
The source crater for Australasian tektites remains to be positively identified. We suggest that Tonle Sap, a roughly oval lake in south-central Cambodia, may represent the remnant of that crater. The size of the lake (about 100 km x 35 km), location (Indochina), inferred geologic age (recent), and orientation of the lake, as well as the geographical distribution of tektites, are consistent with this suggestion. The elongated shape of the lake with its long axis pointing toward Australia may be the result of an oblique impact of a NW to SE-moving object a few km in diameter. The absence of a raised rim and a central peak may be related to a low impact angle, soft target rocks, or high post-impact erosion and sedimentation rates. The scarcity of Muong Nong-type (layered) tektites near Tonle Sap may be due to extensive post-impact alluvial deposition, which buried the tektites. The chemical composition of Upper Indosinias formation sandstones from Phnom Batheay was determined. There are significant differences between the composition of indochinite tektites and these rocks, which are thus unlikely to represent tektite source rocks.
Hartung Jack
Koeberl Christian
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