Geochemistry of Henbury impact glass

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Glass due to meteorite impact, found north of the main crater at Henbury, Northern Territory, Australia (24° 35′ S; 133° 09′ E) has the following composition: SiO2 69.5%; Al2O3 11.37%; FeO 11.45%; MgO 2.18%; CaO 0.61%; Na2O 0.83%; K2O 2.98%; TiO2 0.82%. P 150 ppm; Cr 80 ppm; Li 35 ppm; Ni 3300 ppm; Co 300 ppm; Cu 42 ppm; V 77 ppm; Zr 420 ppm; Mn 1000 ppm; Sc 11 ppm; Sr 85 ppm; Pb 22 ppm; Ba 650 ppm; Bb 115 ppm; Cs4 ppm; R.I. 1.503. When the Fe, Co and Ni contributed by the meteorite are removed, the composition can be matched with that of subgreywacke blocks exposed in the main crater. This subgreywacke grades upwards into quartzite and these sediments exhibit significant inverse relations between SiO2 and the other elements, except for Ca and Zr. No apparent changes in composition during glass formation, apart from the addition of Fe, Co and Ni from the meteorite are observed. The parent material of the impact glass is similar in composition to australites and a subgreywacke higher in the sequence matches the composition of Darwin Glass, confirming that these glasses are similar in composition to terrestrial sediments.

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