Structures and textures of the Murchison and Mighei carbonaceous chondrite matricesHigh-resolution transmission electron microscopy has confirmed earlier observations that the character of the Murchison and Mighei fine-grained matrices is complex in mineralogy and texture. Layer structure minerals occur as planar laths, rounded grains or subhedral grains, and range in size from less than 100 A to about 1 micrometer. Serpentine-type and brucite-type structures predominate in the CM matrices. The occurrence of Povlen chrysolite and a vein of disordered mixed-layer and brucite-type material cutting a large lizardite-type grain suggests that at least some of the matrix materials were formed by alteration of preexisting material.
Document ID
19820038762
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mackinnon, I. D. R. (Arizona State University Tempe, AZ, United States)