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General information and references |
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Publications |
Availability |
ver. 3.59
2007 |
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Almeev, R. R., Holtz, F., Koepke, J. & Parat, F. (2006). Effect of small amount of H2O on the liquidus of olivine, plagioclase and clinopyroxene: an experimental study at 200 and 500 MPa. EMPG-XI. 11th - 13th September, University of Bristol UK.
Almeev, R. R., Holtz, F., Koepke, J. Parat, F., and Botcharnikov, R. (2007) The effect of H2O on olivine crystallization in MORB: Experimental calibration at 200 MPa. American Mineralogist (in press). |
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ver. 3.57
2004 |
First release similar to 3.52 with Ilm subroutine changed to escape some computative problems |
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ver. 3.65
2001 |
Specially calibrated to simulate crystallization of Fe-Ti enriched basaltic liquids |
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Ariskin A.A. The compositional evolution of differentiated liquids from the Skaergaard layered series as determined by geochemical thermometry. Russian Journal of Earth Sciences. 2003. Vol. 5, No. 1 (see Appendix 2) [read >>] |
Contact ariskin@geokhi.ru |
ver. 3.52
2000 |
(1) Ilmenite code was changed to correctly calculate Mg contents in Ilm; (2) K2O in Pl was also corrected. |
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Contact ariskin@geokhi.ru |
ver. 3.5
1999 |
More accurate Mt-melt and Ilm-models were integrated into the program which now allow one to calculate crystal-lization at water-saturated conditions starting with 0.5 wt% H2O in the melt. Other improvements include corrections of mineral-melt distribution coefficients for TiO2 in clino- and orthopyro-xenes, as well K2O in Pl. In addition, OXIDES file is now printed out to see Mt and Ilm compositions calculated on single cation basis. |
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Ariskin A.A., Barmina G.S. (1999) An empirical model for the calculation of spinel-melt equilibrium in mafic igneous systems at atmospheric pressure: II. Fe-Ti oxides. Contrib. Mineral. Petrol. V. 134. p. 251-263. [read >>]
Ariskin A.A. (1999) Phase equilibria modeling in igneous petrology: use of COMAGMAT model for simulating fractionation of ferro-basaltic magmas and the genesis of high-alumina basalt. J. Volcanol. Geotherm. Res. V. 90. p. 115-162. [read >>] |
Contact ariskin@geokhi.ru |
ver. 3.3
1998-01 |
This is INTERNET analogue of the COMAGMAT-3.0 release. |
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COMAGMAT-NET |
ver. 3.0
1993 |
This is a basic DOS-version distributed since 1992. See publications for more details. |
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Ariskin A.A., Barmina G.S., Frenkel M.Ya., Nielsen R.L. (1993) COMAGMAT: a Fortran program to model magma differentiation processes. Computers and Geosciences. V.19. p. 1155-1170. |
Contact ariskin@geokhi.ru |
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OTHER NOTES
(1) Do not hurry to conclude that COMAGMAT is incorrect if during test calculations the calculated crystallization sequences are found to differ from those you expected from a set of experimental data or petrological observations. Instead, try to understand the reason for these differences by setting small temperature shifts for different minerals or by slightly changing the pressure, redox conditions or water content in the melt.
(2) We strongly recommend that COMAGMAT be paired with the INFOREX experimental database. The INFOREX system includes an ability to create mineral-melt datafiles for a given range of compositions and conditions. Those files can be further imported to COMAGMAT to test mineral-melt equilibria temperatures in order to estimate the presence of a systematic shift for a particular mineral. These shifts can be set into the CORREC.DAT files to be used in further calculations.
(3) Before starting petrological calculations, try to model the whole crystallization sequences available in the INFOREX database for the compositional range of interest. Often, an additional small shift of the calculated temperatures is necessary to best fit the experimental data for these particular compositions. In general, the COMAGMAT model works best for tholeiite-like systems, however accounting for the recommendations, it may be also applied to mildly-alkaline and calc-alkaline basalts and andesites.
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