COMAGMAT 5
Calculations of equilibrium and fractional crystallization of S-saturated and S-undersaturated magmas, including changes in the Fe/Ni ratio in silicate melts, femic minerals, and coexisting sulfides, as well as sulfide-silicate (±Fe-Ti oxides) proportions for multiple-saturated mineral assemblages.
COMAGMAT 5
Calculations of equilibrium and fractional crystallization of S-saturated and S-undersaturated magmas, including changes in the Fe/Ni ratio in silicate melts, femic minerals, and coexisting sulfides, as well as sulfide-silicate (±Fe-Ti oxides) proportions for multiple-saturated mineral assemblages.
COMAGMAT 3
Calculations of equilibrium and fractional crystallization for dry and hydrous natural magmas in the range of pressures from 1 atm to 10-12 kbar and including both open (12 oxygen buffers) and closed system fractionation with respect to oxygen. Simulating formation of layered intrusions.
Features
COMAGMAT 5.x |
COMAGMAT 3.x |
|
|---|---|---|
| Calculations of equilibrium and fractional crystallization of S-saturated and S-undersaturated magmas | ||
| Improved precision of calculations at low contents of melt components | ||
| Variable models for melt oxidation state (Fe2+/Fe3+ ratio) | ||
| Calculations of trace elements partition coefficients | ||
| Modeling crystallization at atmospheric pressure | ||
| Modeling crystallization at elevated pressures (up to 10-12 kbar) | ||
| Modeling crystallization in hydrous systems | ||
| Simulation of open (with respect to oxygen) systems, using fO2-buffers | ||
| Simulation of closed to oxygen systems at given Fe2+/Fe3+ ratio | ||
| Simulating formation of layered intrusions | ||
| Correction for mineral-melt liquidus temperatures |
COMAGMAT 5 New
The basic core of the COMAGMAT-5 program includes the algorithm that has been used in previous versions of the COMAGMAT model (ver. 3.0-3.5) designed to simulate mafic magma crystallization processes, but limited to atmospheric pressure and include numerical models for simulating crystallization of S-saturated and S-undersaturated magmas.
Sulfide version of the COMAGMAT program was developed as a part of a cooperative AMIRA project “Ni-PGE potential of mafic and ultramafic magmas – a combined melt inclusion and numerical modelling approach” (P962) and Russian Science Foundation project (No 16-17-10129).
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Recent changes
- ver. 5.2.2.1 - fix import of input files with "comma" decimal separator
- ver. 5.2.2 - "resizable" user interface, fix minor issues on Windows 10
- ver. 5.2.1 - Fe-Ni-S sulfide solubility/stability model
- ver. 5.2.0 - Fe-S sulfide solubility/stability model, silicate minerals recalibration
Compatibility
- Tested on Windows XP, Windows 7 and Windows 10 operation systems.
References
- Ariskin A.A., Danyushevsky L.V., Bychkov K.A., McNeill A.W., Barmina G.S. & Nikolaev G.S. (2013). Modeling Solubility of Fe-Ni Sulfides in Basaltic Magmas: The Effect of Nickel. Economic Geology 108, 1983–2003.
- Ariskin A.A., Bychkov K.A., Nikolaev G.S. & Barmina G.S. (2018). The COMAGMAT-5: Modeling the Effect of Fe-Ni Sulfide Immiscibility in Crystallizing Magmas and Cumulates. Journal of Petrology. V. 59 (2). 283-298.
Applications
- Ariskin A.A., Danyushevsky L.V., Nikolaev G.S., Kislov E.V., Fiorentini M.L., McNeill A.W., Kostitsyn Y., Goemann K., Feig S. & Malyshev A. (2018) The Dovyren Intrusive Complex (Southern Siberia, Russia): Insights into dynamics of an open magma chamber with implications for parental magma origin, composition, and Cu-Ni-PGE fertility. Lithos. 302. 10.1016/j.lithos.2018.01.001.
- Ariskin A.A., Bychkov K.A. & Nikolaev G.S. (2017). Modeling of trace-element composition of sulfide liquid in a crystallizing basalt magma: Development of the R-factor concept. Geochemistry International 55, 465–473.
- Gongalsky B.I., Krivolutskaya N.A., Ariskin A.A. & Nikolaev G.S. (2016). The Chineysky gabbronorite-anorthosite layered massif (NorthernTransbaikalia, Russia): its structure, Fe-Ti-V and Cu-PGE deposits, and parental magma composition. Mineralium Deposita. Mineralium Deposita 51, 1013–1034.
- Ariskin A.A., Kislov E.V., Danyushevsky L.V., Nikolaev G.S., Fiorentini M.L., Gilbert S., Goemann K. & Malyshev A. (2016). Cu–Ni–PGE fertility of the Yoko-Dovyren layered massif (northern Transbaikalia, Russia): thermodynamic modeling of sulfide compositions in low mineralized dunite based on quantitative sulfide mineralogy. Mineralium Deposita. Mineralium Deposita 51, 993–1011.
COMAGMAT 3
The COMAGMAT model is a programs developed to calculate phase equilibria for dry and hydrous natural magmas crystallizing in the range of pressures from 1 atm to 10-12 kbar and including both open (12 oxygen buffers) and closed system fractionation with respect to oxygen. The modeling process may be calculated for systems ranging from basalts to dacites, with modeled major elements including Si - Ti - Al - Fe - Mg - Ca - Na -K and P. Moreover, COMAGMAT allows the user to simulate behaviour of 20 trace elements, including Mn, Ni, Co, Cr, V, Sc, Sr, Ba, Rb, Cu, and REE. The modeled minerals include olivine (Fo-Fa solution), plagioclase (An-Ab), 3 pyroxenes (augite, pigeonite, and orthopyroxene: En-Fs-Wo solutions plus Al and Ti), ilmenite (Ilm-Hem), and magnetite (Mt-Ulv).
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Recent changes
- ver. 3.75 - Fix result output for "Simulating formation of layered intrusions", fix Excel report generation.
- ver. 3.74 - Fix intermediate output for Pigeonite/Opx
- ver. 3.73 - Fix performance issues
- ver. 3.72 - Update water effect on liquidus temperature
- ver. 3.57 - First release similar to 3.52 with Ilm subroutine changed to escape some computative problems
- ver. 3.65 - Specially calibrated to simulate crystallization of Fe-Ti enriched basaltic liquids
- ver. 3.52 - Ilmenite code was changed to correctly calculate Mg contents in Ilm; K2O in Pl was also corrected.
- ver. 3.50 - 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.
- ver. 3.30 - This is INTERNET analogue of the COMAGMAT-3.0 release.
- ver. 3.00 - This is a basic DOS-version distributed since 1992. See publications for more details.
Compatibility
- Tested on Windows XP, Windows 7 and Windows 10 operation systems.
References
- Ariskin A.A. & Barmina G.S. (2004). COMAGMAT: Development of a magma crystallization model and its petrological applications. Geochemistry International 42, s1–s157.
- Almeev, R. R., Holtz, F., Koepke, J. & Parat, F. (2012). Experimental calibration of the effect of H2O on plagioclase crystallization in basaltic melt at 200 MPa. American Mineralogist 97 (7), 1234–1240.
- Almeev R.R., Holtz F., Koepke J., Parat F. & Botcharnikov R. E. (2007). The effect of H2O on olivine crystallization in MORB: Experimental calibration at 200 MPa. American Mineralogist 92, 670–674.
- 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. Journal of Volcanology and Geothermal Research 90, 115–162.
- Ariskin A.A. & Barmina G.S. (1999). An empirical model for the calculation of spinel-melt equilibria in mafic igneous systems at atmospheric pressure: 2. Fe-Ti oxides. Contributions to Mineralogy and Petrology 134, 251–263.
- Ariskin, A. A., Frenkel, M. Y., Barmina, G. S. & Nielsen, R. L. (1993). Comagmat: a Fortran program to model magma differentiation processes. Computers and Geosciences 19, 1155–1170.
Applications
- Ariskin A.A. (2003). The compositional evolution of differentiated liquids from the Skaergaard Layered Series as determined by geochemical thermometry. Russian Journal of Earth Sciences 5, 1–29.
- Ariskin A.A. (2002). Geochemical thermometry of the layered series rocks of the Skaergaard intrusion. Petrology 10, 495–518.