Oxygen Isotopes and Origin of Opal in an Antarctic Ureilite

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Downes H. Beard A. D. Franchi I. A. Greenwood R. C.

79th Annual Meeting of the Meteoritical Society (2016) [#6141]

abstract

updated (27 June, 2016):

NAM2016 press release (27 June 2016)

A backscattered electron image of the narrow opal rim surrounding a bright metallic mineral inclusion in meteorite found in Antarctica. The circular holes in this image are spots where laser analyses have been performed. IMAGE: H. Downes

Images of one of the many pieces of opal found in meteorite EET 83309. At top right is a backscattered electron image (the long thin dark object is opal). At bottom left is an image of silica concentrations in opal and surrounding meteoritic minerals. At top left is an image of oxygen concentrations in opal and surrounding minerals. At bottom right is an image nickel concentrations in opal and surrounding minerals. Credit: H. Downes

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