Mathematics – Logic
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..691k&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 691.
Mathematics
Logic
Carbonaceous Chondrites, Chondrule, Metamorphism (Geology), Thermoluminescence, Crystallization
Scientific paper
Lewis Cliff 85332 (LEW 85332) was initially classified as a CO3 chondrite mainly on the basis of the small sizes of its chondrules. It is similar to the CO3 chondrites in several petrologic characteristics, but its bulk refractory lithophile ratios are lower than those of the CO3 chondrites and its common and volatile siderophile ratios are higher. Although the meteorite shows affinity to CI and CR chondrites in its abundance ratios of refractory lithophiles and refractory siderophiles, it has lower abundance ratios of Mn, Se, Zn, and most volatile siderophiles than CI chondrites and higher abundance ratios of Mn and most volatile siderophiles than CR chondrites. From these petrologic and chemical characteristics, LEW 85332 is designated as a unique carbonaceous chondrite. Several petrologic properties suggest that LEW 85332 is a highly unequilibrated chondrite, corresponding to petrologic type 3.03.1. It has very low thermoluminescence sensitivity, which resembles that of other very primitive CO3 chondrites. We have analyzed chemical zoning of olivines in the LEW 85332 to study the possibility of metamorphism. Both crystallization and metamorphic processes have been considered by applying alternative models of fractional crystallization and diffusive modification.
Kaiden Hiroshi
Milkouchi T.
Miyamoto Manabu
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