Geographic variation in Australasian microtektite concentrations: Implications concerning the location and size of the source crater

Details Geographic variation in Australasian microtektite concentrations: Implications concerning the location and size of the source crater Geographic variation in Australasian microtektite concentrations: Implications concerning the location and size of the source crater

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9919075g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. E9, p. 19,075-19,081

Physics

29

Earth Surface, Impact Melts, Meteorite Craters, Petrography, Planetary Craters, Structural Properties (Geology), Tektites, Asia, Australia, Correlation Coefficients, Indian Ocean, Pacific Ocean

Scientific paper

Geographic variations in the concentration of Australasian microtektites in 42 cores from the Indian Ocean, western equatorial Pacific Ocean, and the Philippine, Celebes, and Sulo Seas were used to predict the location of the Australasian tektite source crater and to estimate its size. The location that seems to best explain the geographic variations in microtektite concentrations is located in central Cambodia at about 12 deg N latitude and 106 deg E longitude. The diameter of the source crater is estimated to be between 32 and 114 km based on thickness of the microtektite layer at each site and distance from the predicted source area in Cambodia. The large range in estimated size of the source crater is due to a lack of knowledge about the value of the exponent that describes the radial decrease in ejecta thickness. Additional microtektite/ejecta-bearing sites closer to the source region could help resolve this problem.

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