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Matrix mineralogy of the Lance CO3 carbonaceous chondrite - A transmission electron microscope studyResults are presented on electron microprobe analyses of three CO chondrites, all of which are falls: Lance, Kainsaz, and Warrenton. The TEM mineralogy results of Lance chondrite show that Fe-rich matrix olivines have been altered to Fe-bearing serpentine and Fe(3+) oxide; matrix metal was also altered to produce Fe(3+) oxides, leaving the residual metal enriched in Ni. Olivine grains in Lance's matrix contain channels along their 100-line and 001-line directions; the formation and convergence of such channels resulted in a grain-size reduction of the olivine. A study of Kainsaz and Warrenton showed that these meteorites do not contain phyllosilicates in their matrices, although both contain Fe(3+) oxide between olivine grains. It is suggested that, prior to its alteration, Lance probably resembled Kainsaz, an unaltered CO3 chondrite.
Document ID
19900045168
Document Type
Reprint (Version printed in journal)
Authors
Keller, Lindsay P. (Arizona State Univ. Tempe, AZ, United States)
Buseck, Peter R. (Arizona State University Tempe, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1990
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 54
ISSN: 0016-7037
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAG9-59
CONTRACT_GRANT: NSF DMR-86-11609
CONTRACT_GRANT: NSF EAR-84-08163
Distribution Limits
Public
Copyright
Other