Preliminary Scientific Results of the International Cambodian Crater Expedition - 1992

Details Preliminary Scientific Results of the International Cambodian Crater Expedition - 1992 Preliminary Scientific Results of the International Cambodian Crater Expedition - 1992

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27q.231h&link_type=abstract

Meteoritics, vol. 27, no. 3, volume 27, page 231

Computer Science

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Scientific paper

The goal of the International Cambodian Crater Expedition 1992 was to collect rocks and view outcrops that might yield evidence for an impact that produced Australasian tektites and the Tonle Sap basin (Hartung, 1990). A two-week reconnaissance in January 1992, enabled us to visit 8 "phnoms" (hills) and collect representative samples from each of them. The hills, with one exception, are located near Phnom Penh, about 100 km southeast of Tonle Sap lake. Breccias were observed, but none are like suevite. Quarries are present at three of these hills. Fracturing on scales of centimeters to meters is common, but evidence for transport of any of these bodies a distance of 100 km was lacking. Reconnaissance sampling of hills closer to Tonle Sap should be undertaken when security restrictions in these areas are eased. The exceptional hill, Phnom Krom, is located 15 km from Angkor Wat, near the northwest shore of Tonle Sap. According to Dottin (2), "the quarry at Phnom Krom exposes compact cinerites, ferruginous scoria, pink rhyolitic lavas, grey, white and black rhyolitic tuffs, dark cinerous sandstones, various volcanic conglomerates, etc." On a scale of hundreds of meters Phnom Krom is a mixture and may be a megabreccia located near the crater rim. Thin sections of 8 samples from Phnom Krom displayed abundant fracturing but no positive evidence for shock metamorphism. Mapping of the rock types exposed in quarries at Phnom Krom is a worthwhile project and would lead to a better understanding of the geology of the Tonle Sap basin. However, a portion of Phnom Krom is "off limits" due to military considerations. To test the Tonle Sap hypothesis for the tektite source crater we predict that element abundances and isotopic signatures of rocks of the Upper Indosinias Formation, exposed at several locations around the Tonle Sap basin, will parallel those of the tektites. References: 1. Hartung, J.B. (1990) Meteoritics (abstract) 25, 369-370. 2. Dottin, O. (1972) Carte Geologique de Reconnaissance a 1/200,000, Republique Khmere, Editions du Bureau de Recherches Geologiques Minieres, Paris.

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