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Terrestrial Alteration of Cm Chondritic Carbonate

Presenter: Mark Tyra
When: April 12, 2004 12AM PDT

In this study, carbonate was extracted
from a set of paired Antarctic CM chondrites
and δ18O, δ17O, δ13C, δ14C ratios measured. Oxygen
isotopes were compared to Benedix et al., 2003’s data
collected for CM chondrite falls to study the effects of
terrestrial oxygen exchange [1]. Carbon isotopes of the
same sample set were examined at the University of
Arizona’s accelerated mass spectrometry (AMS) lab
for insights how terrestrial carbon exchange corresponds
to oxygen’s trends. The meteorites we analyzed
are: EET 96006, EET 96016, EET 96017, and
EET 96019.

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