Chondrules in the Sharps H3 chondrite: Evidence for intergroup compositional differences among ordinary chondrite chondrules

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(89)90285-8· OSTI ID:7242674

Rubin, A E ^[1]; Pernicka, E ^[2]

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1. Univ. of California, Los Angeles (USA)
2. Max-Planck-Institute fuer Kernphysik, Heidelberg (West Germany)

Bulk compositions of 19 chondrules and one matrix-rich sample from H3.4 Sharps were determined by instrumental neutron activation analysis. Samples were characterized petrographically, and mineral compositions were determined by electron microprobe analysis. There is constancy among ordinary chondrite (OC) groups in the compositional interrelationships of different chondrule types; e.g., in H3 as well as L3 and LL3 chondrites, porphyritic chondrules are more refractory than nonporphyritic chondrules. Precursor components of H3 chondrules are closely related to those of LL3 chondrules. The mean Ir/Ni, Ir/Co and Ir/Au ratios of H3 chondrules differ from the corresponding ratios of LL3 chondrules at the 99%, 90% and 79% confidence levels, respectively. The ratios in H3 chondrules exceed those in LL3 chondrules by amounts similar to those by which H whole-rocks exceed LL whole-rocks. These data suggest that there are primary systematic differences in bulk composition between H and LL chondrules. These differences support the inference that chondrule formation occurred after major nebular fractionation events had established the observed bulk compositional differences among OC groups.

• OSTI ID: 7242674
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 53:1; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
640100 -- Astrophysics & Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ACTIVATION ANALYSIS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
CHONDRITES
COBALT COMPOUNDS
DATA COVARIANCES
ELECTRON MICROPROBE ANALYSIS
ELEMENT ABUNDANCE
GEOCHEMISTRY
GEOLOGIC HISTORY
GOLD COMPOUNDS
IRIDIUM COMPOUNDS
METEORITES
MICROANALYSIS
MINERALOGY
NICKEL COMPOUNDS
PETROGENESIS
PETROGRAPHY
QUANTITATIVE CHEMICAL ANALYSIS
REFRACTORY METAL COMPOUNDS
STONE METEORITES
TRANSITION ELEMENT COMPOUNDS