The silicate inclusions of the Ocotillo IAB iron meteorite

Details The silicate inclusions of the Ocotillo IAB iron meteorite The silicate inclusions of the Ocotillo IAB iron meteorite

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..153o&link_type=abstract

Meteoritics & Planetary Science, vol. 33, no. 1, pages 153-155.

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Scientific paper

The Ocotillo IAB iron contains small silicate inclusions consisting of olivine, low-Ca pyroxene, chromian diopside, plagioclase, magnesiochromite, apatite, troilite and metal. The ferromagnesian silicates have a small range of Fe/(Fe+Mg) ratios that are not due to zoning. These phases appear to be not well equilibrated. The FeO content of magnesiochromite is lower than values normally seen in silicate assemblages in IAB irons. The minerals in Ocotillo are generally like silicate assemblages in other IABs, covering similar composition ranges and exhibiting a metamorphic (granoblastic) texture. An estimate was made of the bulk composition of Ocotillo silicate inclusions. The bulk is close to that of ordinary chondrites with the exception of a deficiency in CaO which might be due to a sampling problem associated with the method used to estimate the bulk composition.

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