Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1455w&link_type=abstract
Lunar and Planetary Science, volume 27, page 1455
Other
Carbonates, Chondrites: Carbonaceous, Chondrites: Ordinary, Isotopes: Oxygen, Silica-Rich Grains
Scientific paper
Recently, Bridges et al. have determined oxygen isotopic compositions of silica-rich clasts from Parnallee (LL3.6) and Farmington (L5). On an oxygen three-isotope plot these data fall on a line of slope 0.77, termed the "cristobalite line", or CRIL. Also falling on, or near to, the line are data for CRISPY, a silica-rich class from the L6 chondrite ALH 76003 and a silica-rich class from Bovedy. Clearly the line defined by these points is not without significance, but as yet it has not been fully explained. It appears that the degree of enrichment in the heavier isotopes of oxygen (gauged by the relative positions of individual data points along CRIL) is in some way correlated with the silica content of the individual clasts. However, it should be noted that a nearly pure cristobalite class from Farmington is not an end-member. In other words, the relationship of oxygen isotopic composition with mineralogy is not yet established. In order to solve this puzzle it would be desirable to constrain the nature of the material that must, at some point, have had an oxygen isotopic composition falling on an extension of CRIL, and which underwent isotopic exchange with the silica-rich clasts thereby producing the array of data which now defines CRIL.
Gibson Murray J.
Grady Michael
Pillinger Colin T.
Wight M. J.
Wright Ian P.
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