SIGNIFICANCE OF IRON-RICH SILICATES IN THE MEZO-MADARAS CHONDRITE.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 05, 1965
- Accession Number
- AD0649181
Entities
People
- Robert T. Dodd Jr.
- Ursula B. Marvin
- W. Randall Van Schmus
Organizations
- Air Force Cambridge Research Laboratories