Composition of meteorite impact glass across the Henbury strewnfield

Details Composition of meteorite impact glass across the Henbury strewnfield Composition of meteorite impact glass across the Henbury strewnfield

Jun 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31..961t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 31, Issue 6, pp.961-962

Computer Science

3

Scientific paper

Glass formed by meteorite impact occurs over an area of at least 1500 m 2 at Henbury, Northern Territory, Australia (24°35'S. Lat.; 133°09'E. Long.). Extensive collecting across this strewnfield was undertaken because of variable compositions of potential parent materials. Eight samples of meteorite impact glass from widely separated areas have been analysed. When the iron due to meteorite contamination is removed, the average composition (wt, %) for the major elements is: SiO 2 , 74.5; Al 2 O 3 , 13.1; FeO, 4.0; MgO, 2.3; CaO, 0.6; Na 2 O, 1.0; K 2 O, 3.4; TiO 2 , 1.0. The glass is uniform in composition and the variation in the eight samples is within the limits of analytical error. Fourteen analyses of country rocks are given. Those exposed in the crater walls range from 75 to 90% SiO 2 . The glass composition matches most closely that of thrownout green subgreywacke, which appears to have been derived from near the center of the northwest crater of the double main crater.

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