Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmgp21c0793f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #GP21C-0793
Mathematics
Logic
1519 Magnetic Mineralogy And Petrology, 6030 Magnetic Fields And Magnetism, 6200 Planetary Sciences: Solar System Objects, 6240 Meteorites And Tektites (1028, 3662)
Scientific paper
Results of micromagnetic and microstructural studies of individual chondrules from the Allende carbonaceous meteorite are presented. Allende is a CV3 carbonaceous chondrite consisting mainly of chondrules, matrix with CAIs, olivine inclusions, opaque minerals, and lithic and mineral fragments. The macroscopic texture of Allende reflects abundance of chondrules of sub-millimeter size within the aphanitic black matrix. Allende is part of the oxidized chondrites with an anhydrous mineralogy, with hydrous phases restricted to chondrules and CAIs. Studies indicate secondary alteration processes affecting Allende mineralogy and composition. Chondrules separated for this study have diameters varying from 0.08 to 0.45 cm. Micromagnetic analyses in the chondrules identify magnetite as a main magnetic phase. Magnetic hysteresis data in terms of plots of parameter ratios suggest pseudo-single domain and multidomain states. Relationships of hysteresis parameters with chondrule size, mass, density and shape are obtained. Morphology, internal structure and elemental composition are investigated by scanning electron microscope and WDS spectrometer analyses using a JEOL microprobe. Relationships are correlated to the internal microstructures and elemental compositional variation within the chondrules. Results show distinct mineralogical assemblages with spatial compositional variation, which are correlated to chondrule size and shape.
Floresgutierrez D.
Urrutia Fucugauchi Jaime
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