Tareen, J. A. K. and Fazeli, A. R. and Basavalingu, B. and Bhandige, G. T. (1992) Thermodynamic Data for Dolomite and Kutnahorite from the Experimental Decarbonation Curves. Journal of the Geological Society of India, 40 (6). pp. 545-556.
Full text not available from this repository. (Request a copy)Abstract
The P-T stability field of rhombohedral double carbonates, CaMg (CO3)2 (dolomite) and CaMn (CO3)2 (kutnahorite) has been studied up to 2 kb of PCO2. The dolomite decomposes to CaCO3 (ss) + MgO + CO2 and the kutnahorite to CaCO3 (SS) + MnO + CO2. The kutnahorite was considered to be completely disordered (R3cBAR) near the decomposition temperature while the dolomite was found to be in ordered state at the decomposition temperature, though both were considered to stabilise with ordered structures at lower temperatures. The standard enthalpy and free energy data retrieved for the ordered dolomite is; DELTAH(f)-degrees = -2331.64+/-2.07 kJ/mol, DELTAG(f)-degrees F = -2168.59+/-2.07 kJ/mol., and for the disordered kutnahorite, is; DELTAH(f)-degrees = -2093.46+/-3.77 kJ/mol, DELTAG(f)-degrees = -1944.80+/-3.77 kJ/mol. The new data on dolomite are at least 7 kJ more negative than the earlier reported values. In the low temperature region the double carbonate field is preceded by a metastable two carbonate field of M'CO3 (ss) and M''CO3 (M' = Ca, M'' = Mg, Mn) phases. This is considered to be the likely stage in the natural process of dolomite or kutnahorite formation.
| Item Type: | Article |
|---|---|
| Subjects: | F Earth Science > Geology |
| Divisions: | Department of > Earth Science |
| Depositing User: | Users 23 not found. |
| Date Deposited: | 18 May 2021 06:27 |
| Last Modified: | 17 Jun 2022 10:55 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/16404 |
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