High resolution transmission electron microscopy of two stony meteorites - Murchison and KennaMatrix material from the Murchison C2(M) carbonaceous chondrite and less than micrometer-size pyroxene inclusions in an olivine from the Kenna ureilite have been characterized using high resolution transmission electron microscopy. A diversity of textures and mineral associations, including serpentine-type and brucite-type mixed-layering, occur in the Murchison matrix. Such mixed layer structures are new types of layer silicate. Their presence in the matrix may prove to be genetically significant. The Kenna inclusions, formed at the olivine grain margins, are of two types: (1) a disordered orthopyroxene-clinopyroxene which may have inverted from protopyroxene and (2) a pigeonite with narrow anti-phase domains (80 A to 250 A) and boundaries parallel to (100).
Document ID
19800039433
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mackinnon, I. D. R. (Arizona State Univ. Tempe, AZ, United States)
Buseck, P. R. (Arizona State University Tempe, Ariz., United States)