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