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A unique corundum and refractory metal-nugget bearing micrometeorite P117

DRS at CSIR-National Institute of Oceanography

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Title A unique corundum and refractory metal-nugget bearing micrometeorite P117
 
Creator Rudraswami, N.G.
Reshma, K.
ShyamPrasad, M.
 
Subject Geology and geophysics
Chemistry and biogeochemistry
Geology and geophysics
Chemistry and biogeochemistry
 
Description Micrometeorites provide a large range of samples sourced from a wide variety of planetary materials, thereby providing a scope for expanding the known inventory of solar system materials. Here we report the micrometeorite AAS62-34-P117 having the assemblage of corundum, hibonite, unknown Al-rich phases, FeNi metal blebs, sulfide, and phosphate embedded in Al-rich silicate composition, and Pt-group element nuggets dispersed throughout the micrometeorite. Here, we report the presence of corundum in micrometeorites as a major refractory phase with sizes greater than ~10 mew m. The Al-rich phases have Al2O3 ~50-70%, such high Al phases are not known from meteoritic components either in chondrules or refractory inclusions. In addition, the Ca content is extremely poor to relate it directly to known refractory inclusions, but is very high in Al. The presence of corundum in Al-rich phases indicates the micrometeorite to be early condensate from solar nebula that later got incorporated into Si-rich materials leading to a transformation that produced the unusual Al-rich and Ca-poor phases different from the average solar composition. The observed texture and mineralogy of the micrometeorite appears to have evolved in a nebular setting that has compositional reservoirs different from those of any known components of meteorites.
 
Date 2017-03-01T09:35:32Z
2017-03-01T09:35:32Z
2017
 
Type Journal Article
 
Identifier Meteoritics & Planetary Science, vol.52(1); 2017; 164-173
yes
http://drs.nio.org/drs/handle/2264/5084
 
Language en
 
Relation Meteor_Planet_Sci_52_164.jpg
 
Rights Copyright [2016]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher The Meteoritical Society