Stable isotope fractionation between carbon dioxide and calcite at 900°C

Details Stable isotope fractionation between carbon dioxide and calcite at 900°C Stable isotope fractionation between carbon dioxide and calcite at 900°C

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3747r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 17, pp.3747-3753

Computer Science

2

Scientific paper

Equilibrium stable isotope fractionation factors between carbon dioxide and calcite were determined by direct equilibration of the two phases at 900°C and 12.5 kbar. The results of six three-day runs gave 13 C ( CO 2 -calcite) and 18 O ( CO 2 -calcite) fractionations of +2.70± 0.36% and +3.30 ± 0.16%., respectively (2 ). Runs of 22.5, 45, and 90 min; and 3, 6, 12, and 24 h duration were also conducted. Rapid initial recrystallization accompanied by extensive carbon and oxygen isotope exchange ( 40%) and a very high oxygen/carbon exchange rate ratio (~5) was seen in runs using both natural and synthetic calcite. Subsequent exchange slowed drastically, and the rate of oxygen exchange decreased relative to that of carbon to a constant value of ~3, implicating the involvement of carbonate ion migration in the later, slower stages of exchange. The lower limits of bulk carbon and oxygen diffusion coefficients determined from the partial exchange experiments were 4 × 10 -13 and 9× 10 -13 (cm 2 /s), respectively.

Affiliated with

Also associated with

No associations

Rating

Stable isotope fractionation between carbon dioxide and calcite at 900°C does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Stable isotope fractionation between carbon dioxide and calcite at 900°C, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stable isotope fractionation between carbon dioxide and calcite at 900°C will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1789433