Matrix mineralogy of the Lance CO3 carbonaceous chondrite - A transmission electron microscope study

Details Matrix mineralogy of the Lance CO3 carbonaceous chondrite - A transmission electron microscope study Matrix mineralogy of the Lance CO3 carbonaceous chondrite - A transmission electron microscope study

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1155k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, April 1990, p. 1155-1163.

Computer Science

17

Carbonaceous Chondrites, Meteoritic Composition, Mineralogy, Olivine, Petrography, Electron Microscopy, Iron Oxides, Petrology, Meteorites, Matrix, Mineralogy, Lance, Co3 Chondrites, C Chondrites, Stony Meteorites, Carbonaceous Chondrites, Stony Meteorites, Petrology, Electron Microscopy, Tem, Samples, Meteorite, Laboratory Studies, Metals, Texture, Olivine, Alteration, Serpentine, Iron Oxide, Kainsaz, Origin, Warrington, Comparisons, Formation, Ferrihydrite, Procedure, Hydration, Oxidation, Petrography

Scientific paper

Results 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 alteratrion, Lance probably resembled Kainsaz, an unaltered CO3 chondrite.

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