Chondrules and matrix in the Ornans CO3 meteorite - Possible precursor components

Details Chondrules and matrix in the Ornans CO3 meteorite - Possible precursor components Chondrules and matrix in the Ornans CO3 meteorite - Possible precursor components

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..425r&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, Feb. 1988, p. 425-432.

Computer Science

19

Carbonaceous Chondrites, Chondrule, Meteoritic Composition, Olivine, Pyroxenes, Factor Analysis, Mineralogy, Neutron Activation Analysis, Organic Compounds, Petrography, Meteorites, Chondrules, Matrix, Ornans, Co3 Chondrites, C Chondrites, Parent Material, Samples, Meteorite, Neutron Activation Analysis, Inaa, Laboratory Studies, Mineralogy, Refractory Material, Lithophiles, Siderophiles, Procedure, Petrography, Chronology

Scientific paper

Bulk compositions of 17 chondrules and one sample of matrix from CO3 Ornans were determined by instrumental neutron activation analysis. Chondrule precursor components deduced from chondrule compositions are characterized by: (1) common and slightly volatile siderophiles, Cr and chalcophiles, (2) refractory lithophiles and Na, (3) Mn, Si and modal pyroxene, and (4) FeO and olivine. Component 4 may be closely related to matrix material. Precursor components have now been inferred for OC, EH, CV, CM and CO chondrules. An MN- and Si-rich component occurs exclusively among carbonaceous chondrite chondrules. Although there are significant intergroup differences, common to chondrules in all chondrite groups are refractory-lithophile-rich, common-siderophile-rich, and (with the exception of EH) common-lithophile-rich components. This indicates that the siderophile/lithophile and refractory lithophile/common lithophile fractionations recorded in chondrite whole-rocks were established prior to chondrule formation at all nebular locations.

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