COMAGMAT 5
Calculations of equilibrium and fractional crystallization of Ssaturated and Sundersaturated magmas,
including changes in the Fe/Ni ratio in silicate melts, femic minerals, and coexisting sulfides, as well
as sulfidesilicate (±FeTi oxides) proportions for multiplesaturated mineral assemblages.
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COMAGMAT 3
Calculations of equilibrium and fractional crystallization for dry and hydrous natural magmas in the
range of pressures from 1 atm to 1012 kbar and including both open (12 oxygen buffers) and closed
system fractionation with respect to oxygen. Simulating formation of layered intrusions.
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Features

COMAGMAT 5.x 
COMAGMAT 3.x 
Calculations of equilibrium and fractional crystallization of Ssaturated and Sundersaturated
magmas



Improved precision of calculations at low contents of melt components



Variable models for melt oxidation state (Fe^{2+}/Fe^{3+} ratio)



Calculations of trace elements partition coefficients



Modeling crystallization at atmospheric pressure 


Modeling crystallization at elevated pressures (up to 1012 kbar) 


Modeling crystallization in hydrous systems 


Simulation of open (with respect to oxygen) systems, using fO2buffers 


Simulation of closed to oxygen systems at given Fe^{2+}/Fe^{3+} ratio 


Simulating formation of layered intrusions 


Correction for mineralmelt liquidus temperatures 


COMAGMAT 5 New
The basic core of the COMAGMAT5 program includes the algorithm that has been used in previous
versions of the COMAGMAT model (ver. 3.03.5) designed to simulate mafic magma crystallization processes,
but limited to atmospheric pressure and include numerical models for simulating crystallization of
Ssaturated and Sundersaturated magmas.
Sulfide version of the COMAGMAT program was developed as a part of a cooperative AMIRA project “NiPGE potential
of mafic and ultramafic magmas – a combined melt inclusion and numerical modelling approach” (P962) and Russian
Science Foundation project (No 161710129).
Download
COMAGMAT 5.2.2 »
Recent changes
 ver. 5.2.2  "resizable" user interface, fix minor issues on
Windows 10
 ver. 5.2.1  FeNiS sulfide solubility/stability model
 ver. 5.2.0  FeS sulfide solubility/stability model, silicate
minerals
recalibration
Compatibility
 Tested on Windows XP, Windows 7 and Windows 10 operation systems.
References
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 CuNiPGE fertility. Lithos (in press)

Ariskin A.A., Bychkov K.A. & Nikolaev G.S. (2017). Modeling of traceelement composition of sulfide
liquid in a crystallizing basalt magma: Development of the Rfactor concept. Geochemistry
International 55, 465–473.

Gongalsky B.I., Krivolutskaya N.A., Ariskin A.A. & Nikolaev G.S. (2016). The Chineysky
gabbronoriteanorthosite layered massif (NorthernTransbaikalia, Russia): its structure, FeTiV and
CuPGE 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 YokoDovyren 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 1012 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 (FoFa solution), plagioclase
(AnAb), 3 pyroxenes (augite, pigeonite, and orthopyroxene: EnFsWo solutions plus Al and Ti), ilmenite
(IlmHem), and magnetite (MtUlv).
Download
COMAGMAT 3.73 »
Recent changes
 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
FeTi 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 Mtmelt and Ilmmodels were
integrated into the program which now allow one to
calculate crystallization at watersaturated conditions starting with 0.5 wt% H2O in the melt. Other
improvements include corrections of mineralmelt distribution coefficients for TiO2 in clino and
orthopyroxenes, 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 COMAGMAT3.0
release.
 ver. 3.00  This is a basic DOSversion 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 ferrobasaltic magmas and the genesis of highalumina basalt. Journal of
Volcanology and Geothermal Research 90, 115–162.

Ariskin A.A. & Barmina G.S. (1999). An empirical model for the calculation of spinelmelt
equilibria in mafic igneous systems at atmospheric pressure: 2. FeTi 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