Chemical and physical studies of chondrites: 10. Cathodoluminescence and phase composition studies of metamorphism and nebular processes in chondrules of type 3 ordinary chondrites

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Geochimica et Cosmochimica Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(92)90171-E· OSTI ID:7159378

DeHart, J M; Jie, Lu; Benoit, P H; Sears, D W.G. ^[1]; Lofgren, G E ^[2]

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1. Univ. of Arkansas, Fayetteville (United States)
2. NASA Johnson Space Center, Houston, TX (United States)

The cathodoluminescence (CL) properties of eight type 3 ordinary chondrites and one L5 chondrite have been determined, and phenocryst and mesostasis compositions have been analyzed in the chondrules of four of them (Semarkona, type 3.0; Krymka, 3.1; Allan Hills A77214, 3.5; and Dhajala, 3.8) in order to investigate their origins and metamorphic history. In the present study, the authors discuss the CL properties of nine ordinary chondrites of a variety of petrologic types with particular emphasis on detailed studies of the compositions of the relevant phases in four of these: Semarkona (3.0), Krymka (3.1), Allan Hills A77214 (3.5), and Dhajala (3.8). They describe a means of classifying chondrules that is based on the composition of their two major components, the mesostasis and phenocrysts. The system is applicable to > 90-95% off the chondrules in a given meteorite and it describes the range of material produced by nebular material and of the effect of metamorphism on the chondrules. They also discuss the relevance of the results for the origin of the nine chondrite classes.

• OSTI ID: 7159378
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Journal Name: Geochimica et Cosmochimica Acta; (United States) Vol. 56:10; ISSN GCACAK; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ANORTHOSITES
CATHODOLUMINESCENCE
CHEMICAL COMPOSITION
CHEMICAL PROPERTIES
CHEMISTRY
CHONDRITES
CLASSIFICATION
GABBROS
GEOCHEMISTRY
GEOLOGIC HISTORY
GEOLOGY
IGNEOUS ROCKS
LUMINESCENCE
METAMORPHISM
METEORITES
MINERALOGY
MINERALS
ORIGIN
OXIDE MINERALS
PETROLOGY
PHASE STUDIES
PHYSICAL PROPERTIES
PLUTONIC ROCKS
QUARTZ
ROCKS
STONE METEORITES