The Butterflies of Principal Components: A Case of Ultrafine-Grained Polyphase Units

Details The Butterflies of Principal Components: A Case of Ultrafine-Grained Polyphase Units The Butterflies of Principal Components: A Case of Ultrafine-Grained Polyphase Units

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1073r&link_type=abstract

Lunar and Planetary Science, volume 27, page 1073

Mathematics

Logic

1

Components: Principal, Cosmic Dust, Interplanetary Dust Particles, Microscopy: Analytical Electron, Petrology

Scientific paper

Dusts in the accretion regions of chondritic interplanetary dust particles [IDPs] consisted of three principal components: carbonaceous units [CUs], carbon-bearing chondritic units [GUs] and carbon-free silicate units [PUs]. Among others, differences among chondritic IDP morphologies and variable bulk C/Si ratios reflect variable mixtures of principal components. The spherical shapes of the initially amorphous principal components remain visible in many chondritic porous IDPs but fusion was documented for CUs, GUs and PUs. The PUs occur as coarse- and ultrafine-grained units that include so called GEMS. Spherical principal components preserved in an IDP as recognisable textural units have unique proporties with important implications for their petrological evolution from pre-accretion processing to protoplanet alteration and dynamic pyrometamorphism. Throughout their lifetime the units behaved as closed-systems without chemical exchange with other units. This behaviour is reflected in their mineralogies while the bulk compositions of principal components define the environments wherein they were formed.

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