Accession Number : AD0649181
Title : SIGNIFICANCE OF IRON-RICH SILICATES IN THE MEZO-MADARAS CHONDRITE.
Descriptive Note : Environmental research papers,
Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Personal Author(s) : Dodd,Robert T. , Jr. ; Van Schmus,W. Randall ; Marvin,Ursula B.
Report Date : 05 DEC 1965
Pagination or Media Count : 18
Abstract : Several chondrules in the Mezo-Madaras chondrite contain the disequilibrium mineral assemblage: ferrous olivine--magnesian pyroxene--merrihueite (approximately (K > or = Na)2 (Fe > or = Mg)5 Si12O30) plus or minus metallic nickel-iron. The ferrous silicates in this assemblage were probably formed by introduction of FeO into an earlier igneous assemblage which consisted or enstatite or clinoenstatite, a magnesian analogue of merrihueite, and silica. Textural and chemical evidence indicate that this alteration of the chondrules took place before they were incorporated in the chondrite. (Author)
Descriptors : (*METEORITES, *MINERALS), SILICATES, IRON COMPOUNDS, IRON, NICKEL, IGNEOUS ROCK, MICROSTRUCTURE, PETROGRAPHY
Subject Categories : Astrophysics
Geology, Geochemistry and Mineralogy
Distribution Statement : APPROVED FOR PUBLIC RELEASE