Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..438a&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 438
Other
Abundance, Chemical Analysis, Interstellar Space, Isotopic Labeling, Meteoritic Composition, Meteoritic Diamonds, Carbon Dioxide, Chemical Composition, Crystal Structure, Metamorphism (Geology), Trace Elements
Scientific paper
The recognition that the abundance of interstellar grains in primitive meteorites may be a function of metamorphic processing means that these highly resistant minerals, which are replete in exotic trace components, can be used to investigate early solar system and parent body history. In order to make this step, it is well recognized that the recovery of diamond and the other carbonaceous minerals should be as near complete as possible. Given the very fine-grained nature of the components of interest, particularly diamond, which exists as nonometer-sized crystals, we need to review our techniques for processing the meteorites to obtain acid resistant residues and the means employed to estimate yields. In order to limit the processing losses, we have reduced the number of steps in the acid dissolution phase, particularly potentially hazardous liquid transfers, to a minimum. Our technique for determining diamond is the absolute measurement of CO2 liberated by bulk or stepped combustion calibrated by terrestrial diamond; we obtain delta C-13 and delta N-15 as supplementary information. The basic acid dissolution procedure we are investigating is given. Using this treatment, a 1.09-g sample of Allende was found to contain 192 ppm diamond with a delta C-13 of -33.03% by a bulk combustion technique or 203 ppm (delta C-13 = -33.7%) by stepped combustion. This abundance is in excess of the 149 ppm obtained by our earlier multistep processing but does not approach the 250 ppm reported by others. We are currently evaluating the potential losses incurred by our technique at the liquid removal stages, investigating sample heterogeneity and considering whether our low yields compared to those of others are a systematic effect.
Arden John W.
Pillinger Colin T.
Verchovsky Alexander B.
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