A unique type 3 ordinary chondrite containing graphite-magnetite aggregates - Allan Hills A77011ALHA 77011, which is the object of study in the present investigation, is a chondrite of the 1977 meteorite collection from Allan Hills, Antarctica. It contains an opaque and recrystallized silicate matrix (Huss matrix) and numerous aggregates consisting of micron- and submicron-sized graphite and magnetite. It is pointed out that no abundant graphite-magnetite aggregates could be observed in other type 3 ordinary chondrites, except for Sharps. Attention is given to the results of a modal analysis, relations between ALHA 77011 and other type 3 ordinary chondrites, and the association of graphite-magnetite and metallic Fe, Ni. The discovery of graphite-magnetite aggregates in type 3 ordinary chondrites is found to suggest that this material may have been an important component in the formation of ordinary chondrites.
Document ID
19820048209
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mckinley, S. G. (New Mexico Univ. Albuquerque, NM, United States)
Scott, E. R. D. (New Mexico Univ. Albuquerque, NM, United States)
Taylor, G. J. (New Mexico Univ. Albuquerque, NM, United States)
Keil, K. (New Mexico, University Albuquerque, NM, United States)