- Welcome to MELTS Software Users.
News:
alphaMELTS 2.3 standalone & for MATLAB/Python is now open source and available on GitHub (https://github.com/magmasource/alphaMELTS).
alphaMELTS 1.9 is available at the legacy download and information site.
For news of all MELTS software see the MELTS Facebook page.
Recent posts
#21
General usage / Re: How to interpret the Phase...
Last post by Paula - August 15, 2025, 01:47:47 PMIt sounds like you are running the alphamelts_win64.exe directly rather than the run-alphamelts.command Perl script. Did you install Perl and run the install.command script? If so, then try working through the tutorial to see how to call alphaMELTS:
https://magmasource.caltech.edu/forum/index.php/topic,975.0.html
Make sure you exit the program before trying to open the output files. This allows the run-alphamelts.command script to process the Phase_main_tbl.txt file so that it is more understandable.
If you didn't install alphaMELTS, or if you can't get it to work as described in the tutorial example... then please be patient. There is a much easier way to install Perl and alphaMELTS on Windows coming soon that would be worth waiting for - it's not quite ready yet but should be sometime in the next month or so.
In the meantime, you can run the alphamelts_win64.exe file but you should choose the old graphical user interface style of output (which is the same as easyMelts generates). You can do this by adding a line "Output: both" or "Output: tbl" in your .melts file.
Paula
https://magmasource.caltech.edu/forum/index.php/topic,975.0.html
Make sure you exit the program before trying to open the output files. This allows the run-alphamelts.command script to process the Phase_main_tbl.txt file so that it is more understandable.
If you didn't install alphaMELTS, or if you can't get it to work as described in the tutorial example... then please be patient. There is a much easier way to install Perl and alphaMELTS on Windows coming soon that would be worth waiting for - it's not quite ready yet but should be sometime in the next month or so.
In the meantime, you can run the alphamelts_win64.exe file but you should choose the old graphical user interface style of output (which is the same as easyMelts generates). You can do this by adding a line "Output: both" or "Output: tbl" in your .melts file.
Paula
#22
Windows / Re: Nothing seems to work
Last post by Anorthosite_Nerd - August 11, 2025, 10:07:12 AMStill looking for some advice getting started. Is there any more up-to-date materials to help new users? Using the production server seems like the simplest solution, but I still receive a "403: Forbidden; Sorry, you are not currently authorized to use this hub. Please contact the hub administrator" error when I attempt to follow the directions described in Mark Ghiorso's tutorial. Can anyone refer me to the hub administrator?
#23
General usage / How to interpret the Phase_mai...
Last post by mazhiwangxy - August 10, 2025, 03:27:44 AMI am using alphaMELT (ver.1.2.0) based on windows. The output text confused me. For the Phase_main_tbl.txt, what does the first four columns means. For example, at liquidus temperature, in the liquid phase the four columns are 99.518, -1275, 270.347 and 41.55. But for the plagiocalse phase, the four columns are 1.055, -14664. 2.398, 1.279. It seams that 99.518 and 1.055 are mass. But what are the remain three columns mean?
And I also want to ask how to calculate the volume of each phase.
And I also want to ask how to calculate the volume of each phase.
#24
Windows / Nothing seems to work
Last post by Anorthosite_Nerd - August 05, 2025, 02:15:44 PMI'm having trouble getting any version of MELTS to work. I tried the most recent excel version that I found in a post from last year, but despite trying everything in the Troubleshooting MELTS_Excel FAQ I still get a "server returned no results" error.
I then tried to use the production server in the way described in this video. I created a GitLab account, clicked "sign in with gitlab," approved the ENKI server authorization request, but then I get a "403: Forbidden; Sorry, you are not currently authorized to use this hub. Please contact the hub administrator."
I then tried to download Docker and using a local image. Long story short, it's not working either. I'm at a bit of a loss. Any advice would be appreciated.
I then tried to use the production server in the way described in this video. I created a GitLab account, clicked "sign in with gitlab," approved the ENKI server authorization request, but then I get a "403: Forbidden; Sorry, you are not currently authorized to use this hub. Please contact the hub administrator."
I then tried to download Docker and using a local image. Long story short, it's not working either. I'm at a bit of a loss. Any advice would be appreciated.
#25
The MELTS family of algorithms, and scientific discussion / Re: how to suppress mineral in...
Last post by Paula - July 02, 2025, 06:03:42 PMHi Kai,
To suppress a phase you add a .melts file-like line in the Settings. Something like:
The Find Wet Liquidus result differs slightly because it performs one or more equilibration calculations as part of the algorithm, whereas the original Find Liquidus routine only uses affinities. In this case, the temperatures agree to within 0.2 oC because the system is not water-saturated.
The MATLAB and Python versions always use Find Wet Liquidus. The app has both options for backwards compatibility and so it can be more easily compared to other software, such as easyMelts.
Paula
To suppress a phase you add a .melts file-like line in the Settings. Something like:
Code Select
ptpath.engine.setSystemProperties(["Suppress: olivine"])The Find Wet Liquidus result differs slightly because it performs one or more equilibration calculations as part of the algorithm, whereas the original Find Liquidus routine only uses affinities. In this case, the temperatures agree to within 0.2 oC because the system is not water-saturated.
The MATLAB and Python versions always use Find Wet Liquidus. The app has both options for backwards compatibility and so it can be more easily compared to other software, such as easyMelts.
Paula
#26
General usage / Re: MELTS_Excel
Last post by Paula - July 02, 2025, 05:49:01 PMThe last five columns are the molar proportions of the end members in the order listed in the header i.e:
https://magmasource.caltech.edu/forum/index.php/topic,143.0.html
There is a mistake in the header for the oxides, though. It lists all the MELTS system oxides, in the standard MELTS order. However, values are only printed for oxides in the spinel solid solution, so the header should read:
The spinel calculator mentioned in the thread is still there (https://magmasource.caltech.edu/calculator/spinel.php). The ordering calculation no longer works. But if you select "Assume inverse ordering within range of configurational freedom e.g. [4]B[6](A,B)2O4" (which is a good approximation for magnetite-rich compositions) you can verify that the values in your output can be converted from oxide wt% to end-member molar proportions and vice versa.
Paula
Quotechromite hercynite magnetite spinel ulvospinelIf you are confused why the molar proportion of hercynite is negative then see this thread:
https://magmasource.caltech.edu/forum/index.php/topic,143.0.html
There is a mistake in the header for the oxides, though. It lists all the MELTS system oxides, in the standard MELTS order. However, values are only printed for oxides in the spinel solid solution, so the header should read:
QuoteTiO2 (wt%) Al2O3 (wt%) Fe2O3 (wt%) Cr2O3 (wt%) FeO (wt%) MgO (wt%)
The spinel calculator mentioned in the thread is still there (https://magmasource.caltech.edu/calculator/spinel.php). The ordering calculation no longer works. But if you select "Assume inverse ordering within range of configurational freedom e.g. [4]B[6](A,B)2O4" (which is a good approximation for magnetite-rich compositions) you can verify that the values in your output can be converted from oxide wt% to end-member molar proportions and vice versa.
Paula
#27
General usage / Re: MELTS_Excel
Last post by Renqiang Liao - June 30, 2025, 11:44:12 PMDear Paula,
The following data is a portion of spinel that I have intercepted from the modeling results. How should I know the percentage of magnetite and the corresponding chemical composition from this data.
If it is convenient, you can copy and paste it into an excel sheet for better visualization.
I would be very grateful if you could help.
Thanks for your time.
Renqiang
Index T (C) P (MPa) deltaQFM mass (g) rho (g/cm3) G (kJ) H (kJ) S (J/K) Cp (J/K) V (cm3) alpha (1/K) beta (1/bar) d2V/dT2 d2V/dP2 d2V/dTdP SiO2 (wt%) TiO2 (wt%) Al2O3 (wt%) Fe2O3 (wt%) Cr2O3 (wt%) FeO (wt%) MnO (wt%) MgO (wt%) NiO (wt%) CoO (wt%) CaO (wt%) Na2O (wt%) K2O (wt%) P2O5 (wt%) H2O (wt%) CO2 (wt%) SO3 (wt%) Cl2O-1 (wt%) F2O -1 (wt%) chromite hercynite magnetite spinel ulvospinel
6 1105 200 -5.150465347 0.231471602 4.640479356 -1.945716914 -1.277172938 0.485102475 0.218354804 0.049880968 4.9189E-05 5.15401E-07 1.07E-09 1.18E-13 0 5.72131326 7.262995515 52.41379176 28.99671017 5.605189297 0 -0.144013252 0.69676763 0.295232331 0.152013291
7 1100 200 -5.272024288 0.660819925 4.647505403 -5.537215919 -3.638827329 1.382506346 0.62238235 0.142188092 4.84386E-05 5.08028E-07 3.00E-09 3.34E-13 0 6.101202423 7.094900379 51.79323501 29.56289271 5.44776948 0 -0.139452471 0.689660091 0.287416716 0.162375663
8 1095 200 -5.386580892 1.089486164 4.657384135 -9.08110738 -5.969567205 2.2742683 1.023861994 0.233926628 4.775E-05 5.00868E-07 4.89E-09 5.46E-13 0 6.45611602 6.83528349 51.30338074 30.1613798 5.24383995 0 -0.134442707 0.684843634 0.277348684 0.172250389
9 1090 200 -5.49784227 1.483105541 4.666205255 -12.30408963 -8.09286605 3.089332485 1.391014944 0.317839756 4.70828E-05 4.94047E-07 6.57E-09 7.36E-13 0 6.799090722 6.603662114 50.81504373 30.72119391 5.061009519 0 -0.129902438 0.679827743 0.268271772 0.181802924
10 1085 200 -5.60500363 1.846573858 4.674443587 -15.25158567 -10.03859442 3.838303018 1.728694187 0.395036077 4.64446E-05 4.87578E-07 8.08E-09 9.08E-13 0 7.126026765 6.386823246 50.34716959 31.24904249 4.890937914 0 -0.125689911 0.674959337 0.259792101 0.190938473
11 1080 200 -5.707862988 2.181721318 4.682162581 -17.94371559 -11.82017522 4.525396573 2.038867231 0.465964451 4.58369E-05 4.81467E-07 9.44E-09 1.06E-12 0 7.435494404 6.183746821 49.90305023 31.74531895 4.732389603 0 -0.121766729 0.670296288 0.251855511 0.19961493
12 1075 200 -5.806299105 2.490420898 4.689419053 -20.40001202 -13.45047297 5.154870784 2.323498451 0.531072372 4.52605E-05 4.75718E-07 1.07E-08 1.20E-12 0 7.726688972 5.993428681 49.48482547 32.21079248 4.584264394 0 -0.118100376 0.665879867 0.244413248 0.207807261
13 1070 200 -5.900259468 2.774547481 4.696263308 -22.63926775 -14.9417482 5.73094557 2.584517418 0.590798961 4.47155E-05 4.70325E-07 1.17E-08 1.33E-12 0 7.999334814 5.814891064 49.0936505 32.64653659 4.44558703 0 -0.114663626 0.661736924 0.237421696 0.215505006
14 1065 200 -5.989747362 3.035942436 4.702739516 -24.67939356 -16.30560615 6.257734491 2.82379151 0.645568913 4.42014E-05 4.65279E-07 1.27E-08 1.44E-12 0 8.253579283 5.647194345 48.72988008 33.05385129 4.315494996 0 -0.11143379 0.657882361 0.230841964 0.222709465
15 1060 200 -6.074809387 3.276385265 4.708886234 -26.53730421 -17.55295321 6.739189893 3.043104345 0.69578773 4.37173E-05 4.60568E-07 1.36E-08 1.55E-12 0 8.489889645 5.489447225 48.39324864 33.43418879 4.193225705 0 -0.108391944 0.654321596 0.224639415 0.229430932
16 1055 200 -6.155524322 3.497572699 4.714737023 -28.22884057 -18.69396821 7.17906288 3.244140478 0.741838343 4.3262E-05 4.56177E-07 1.44E-08 1.64E-12 0 8.708960801 5.340814135 48.08303288 33.78908822 4.078103966 0 -0.105522204 0.651052829 0.218783172 0.235686203
17 1050 200 -6.231993704 3.701104755 4.720321069 -29.76872895 -19.73809115 7.580877306 3.428475964 0.784079028 4.2834E-05 4.52089E-07 1.51E-08 1.73E-12 0 8.91163761 5.200519572 47.79819036 34.12012214 3.969530318 0 -0.102811093 0.648068999 0.21324564 0.241496454
18 1045 200 -6.304334249 3.888476742 4.725663786 -31.17057357 -20.69402831 7.947915832 3.59757393 0.822842445 4.24318E-05 4.48287E-07 1.58E-08 1.80E-12 0 9.098852637 5.067849689 47.53747208 34.42885503 3.866970562 0 -0.100247006 0.645359401 0.208002075 0.24688553
19 1040 200 -6.372671956 4.061076067 4.730787363 -32.44687616 -21.56977149 8.283215687 3.752784145 0.858435553 4.20539E-05 4.44754E-07 1.64E-08 1.88E-12 0 9.271578336 4.942151694 47.29951056 34.71681281 3.769946603 0 -0.097819792 0.642910973 0.203030196 0.251878623
20 1035 200 -6.437137694 4.220182636 4.735711256 -33.60907599 -22.37262773 8.589571729 3.895345538 0.891140192 4.16986E-05 4.41472E-07 1.69E-08 1.94E-12 0 9.430791759 4.82283163 47.0828863 34.98546171 3.678028603 0 -0.095520418 0.640709285 0.19830985 0.256501283
The following data is a portion of spinel that I have intercepted from the modeling results. How should I know the percentage of magnetite and the corresponding chemical composition from this data.
If it is convenient, you can copy and paste it into an excel sheet for better visualization.
I would be very grateful if you could help.
Thanks for your time.
Renqiang
Index T (C) P (MPa) deltaQFM mass (g) rho (g/cm3) G (kJ) H (kJ) S (J/K) Cp (J/K) V (cm3) alpha (1/K) beta (1/bar) d2V/dT2 d2V/dP2 d2V/dTdP SiO2 (wt%) TiO2 (wt%) Al2O3 (wt%) Fe2O3 (wt%) Cr2O3 (wt%) FeO (wt%) MnO (wt%) MgO (wt%) NiO (wt%) CoO (wt%) CaO (wt%) Na2O (wt%) K2O (wt%) P2O5 (wt%) H2O (wt%) CO2 (wt%) SO3 (wt%) Cl2O-1 (wt%) F2O -1 (wt%) chromite hercynite magnetite spinel ulvospinel
6 1105 200 -5.150465347 0.231471602 4.640479356 -1.945716914 -1.277172938 0.485102475 0.218354804 0.049880968 4.9189E-05 5.15401E-07 1.07E-09 1.18E-13 0 5.72131326 7.262995515 52.41379176 28.99671017 5.605189297 0 -0.144013252 0.69676763 0.295232331 0.152013291
7 1100 200 -5.272024288 0.660819925 4.647505403 -5.537215919 -3.638827329 1.382506346 0.62238235 0.142188092 4.84386E-05 5.08028E-07 3.00E-09 3.34E-13 0 6.101202423 7.094900379 51.79323501 29.56289271 5.44776948 0 -0.139452471 0.689660091 0.287416716 0.162375663
8 1095 200 -5.386580892 1.089486164 4.657384135 -9.08110738 -5.969567205 2.2742683 1.023861994 0.233926628 4.775E-05 5.00868E-07 4.89E-09 5.46E-13 0 6.45611602 6.83528349 51.30338074 30.1613798 5.24383995 0 -0.134442707 0.684843634 0.277348684 0.172250389
9 1090 200 -5.49784227 1.483105541 4.666205255 -12.30408963 -8.09286605 3.089332485 1.391014944 0.317839756 4.70828E-05 4.94047E-07 6.57E-09 7.36E-13 0 6.799090722 6.603662114 50.81504373 30.72119391 5.061009519 0 -0.129902438 0.679827743 0.268271772 0.181802924
10 1085 200 -5.60500363 1.846573858 4.674443587 -15.25158567 -10.03859442 3.838303018 1.728694187 0.395036077 4.64446E-05 4.87578E-07 8.08E-09 9.08E-13 0 7.126026765 6.386823246 50.34716959 31.24904249 4.890937914 0 -0.125689911 0.674959337 0.259792101 0.190938473
11 1080 200 -5.707862988 2.181721318 4.682162581 -17.94371559 -11.82017522 4.525396573 2.038867231 0.465964451 4.58369E-05 4.81467E-07 9.44E-09 1.06E-12 0 7.435494404 6.183746821 49.90305023 31.74531895 4.732389603 0 -0.121766729 0.670296288 0.251855511 0.19961493
12 1075 200 -5.806299105 2.490420898 4.689419053 -20.40001202 -13.45047297 5.154870784 2.323498451 0.531072372 4.52605E-05 4.75718E-07 1.07E-08 1.20E-12 0 7.726688972 5.993428681 49.48482547 32.21079248 4.584264394 0 -0.118100376 0.665879867 0.244413248 0.207807261
13 1070 200 -5.900259468 2.774547481 4.696263308 -22.63926775 -14.9417482 5.73094557 2.584517418 0.590798961 4.47155E-05 4.70325E-07 1.17E-08 1.33E-12 0 7.999334814 5.814891064 49.0936505 32.64653659 4.44558703 0 -0.114663626 0.661736924 0.237421696 0.215505006
14 1065 200 -5.989747362 3.035942436 4.702739516 -24.67939356 -16.30560615 6.257734491 2.82379151 0.645568913 4.42014E-05 4.65279E-07 1.27E-08 1.44E-12 0 8.253579283 5.647194345 48.72988008 33.05385129 4.315494996 0 -0.11143379 0.657882361 0.230841964 0.222709465
15 1060 200 -6.074809387 3.276385265 4.708886234 -26.53730421 -17.55295321 6.739189893 3.043104345 0.69578773 4.37173E-05 4.60568E-07 1.36E-08 1.55E-12 0 8.489889645 5.489447225 48.39324864 33.43418879 4.193225705 0 -0.108391944 0.654321596 0.224639415 0.229430932
16 1055 200 -6.155524322 3.497572699 4.714737023 -28.22884057 -18.69396821 7.17906288 3.244140478 0.741838343 4.3262E-05 4.56177E-07 1.44E-08 1.64E-12 0 8.708960801 5.340814135 48.08303288 33.78908822 4.078103966 0 -0.105522204 0.651052829 0.218783172 0.235686203
17 1050 200 -6.231993704 3.701104755 4.720321069 -29.76872895 -19.73809115 7.580877306 3.428475964 0.784079028 4.2834E-05 4.52089E-07 1.51E-08 1.73E-12 0 8.91163761 5.200519572 47.79819036 34.12012214 3.969530318 0 -0.102811093 0.648068999 0.21324564 0.241496454
18 1045 200 -6.304334249 3.888476742 4.725663786 -31.17057357 -20.69402831 7.947915832 3.59757393 0.822842445 4.24318E-05 4.48287E-07 1.58E-08 1.80E-12 0 9.098852637 5.067849689 47.53747208 34.42885503 3.866970562 0 -0.100247006 0.645359401 0.208002075 0.24688553
19 1040 200 -6.372671956 4.061076067 4.730787363 -32.44687616 -21.56977149 8.283215687 3.752784145 0.858435553 4.20539E-05 4.44754E-07 1.64E-08 1.88E-12 0 9.271578336 4.942151694 47.29951056 34.71681281 3.769946603 0 -0.097819792 0.642910973 0.203030196 0.251878623
20 1035 200 -6.437137694 4.220182636 4.735711256 -33.60907599 -22.37262773 8.589571729 3.895345538 0.891140192 4.16986E-05 4.41472E-07 1.69E-08 1.94E-12 0 9.430791759 4.82283163 47.0828863 34.98546171 3.678028603 0 -0.095520418 0.640709285 0.19830985 0.256501283
#28
General usage / Re: MELTS_Excel
Last post by Renqiang Liao - June 25, 2025, 12:27:41 AMDear Paula,
I need your help with a computational detail. I used MELTS_Excel to simulate the process of how basaltic magma changes into different minerals, and the results show magnetite in the crystalline mineral phase. However, the simulation classifies magnetite as spinel, which contains chromite, hercynite, magnetite, spinel, and ulvospinel. I understand that magnetite and spinel have similar crystal structures, which is why this happens. But how do I know the percentage of magnetite and its chemical compositions from the spinel results? I'm sorry, but I don't know how to upload a picture to express my confusion more clearly.
Thanks for your time!
Renqiang
I need your help with a computational detail. I used MELTS_Excel to simulate the process of how basaltic magma changes into different minerals, and the results show magnetite in the crystalline mineral phase. However, the simulation classifies magnetite as spinel, which contains chromite, hercynite, magnetite, spinel, and ulvospinel. I understand that magnetite and spinel have similar crystal structures, which is why this happens. But how do I know the percentage of magnetite and its chemical compositions from the spinel results? I'm sorry, but I don't know how to upload a picture to express my confusion more clearly.
Thanks for your time!
Renqiang
#29
The MELTS family of algorithms, and scientific discussion / Re: how to suppress mineral in...
Last post by Kai Wen - June 24, 2025, 07:05:12 AMMoreover, sorry, in the app, it seems to adjust my content automatically, if I choose find wet liquids
find wet liquids
Initial alphaMELTS calculation at: P 4000.000000 (bars), T 1113.085938 (C)
liquid: SiO2 TiO2 Al2O3 Fe2O3 Cr2O3 FeO MnO MgO NiO CoO CaO Na2O K2O P2O5 H2O
98.8228 g 59.87 0.63 17.73 0.98 0.00 4.13 0.13 2.91 0.00 0.00 7.08 2.86 1.67 0.00 2.02
Activity of H2O = 0.21086 Melt fraction = 0.994465
clinopyroxene: 0.550002 g, composition Na0.02Ca0.73Fe''0.23Mg0.90Fe'''0.05Ti0.01Al0.20Si1.88O6
find liquids
Initial alphaMELTS calculation at: P 4000.000000 (bars), T 1113.281250 (C)
liquid: SiO2 TiO2 Al2O3 Fe2O3 Cr2O3 FeO MnO MgO NiO CoO CaO Na2O K2O P2O5 H2O
99.3730 g 59.82 0.63 17.66 0.99 0.00 4.14 0.13 2.98 0.00 0.00 7.14 2.84 1.66 0.00 2.01
Activity of H2O = 0.209584 Melt fraction = 1
not same
find wet liquids
Initial alphaMELTS calculation at: P 4000.000000 (bars), T 1113.085938 (C)
liquid: SiO2 TiO2 Al2O3 Fe2O3 Cr2O3 FeO MnO MgO NiO CoO CaO Na2O K2O P2O5 H2O
98.8228 g 59.87 0.63 17.73 0.98 0.00 4.13 0.13 2.91 0.00 0.00 7.08 2.86 1.67 0.00 2.02
Activity of H2O = 0.21086 Melt fraction = 0.994465
clinopyroxene: 0.550002 g, composition Na0.02Ca0.73Fe''0.23Mg0.90Fe'''0.05Ti0.01Al0.20Si1.88O6
find liquids
Initial alphaMELTS calculation at: P 4000.000000 (bars), T 1113.281250 (C)
liquid: SiO2 TiO2 Al2O3 Fe2O3 Cr2O3 FeO MnO MgO NiO CoO CaO Na2O K2O P2O5 H2O
99.3730 g 59.82 0.63 17.66 0.99 0.00 4.14 0.13 2.98 0.00 0.00 7.14 2.84 1.66 0.00 2.01
Activity of H2O = 0.209584 Melt fraction = 1
not same
#30
The MELTS family of algorithms, and scientific discussion / how to suppress mineral in py ...
Last post by Kai Wen - June 24, 2025, 06:56:14 AMHello,
I tried to use 2.3.1 alphamelts-py to stimulate magmatic processes. How could I set the suppress phase?
Moreover, in the app, we could find liquid temperature for wet or not, but we could not find that function in Python. Does that influence the calculation?
Many thanks.
Best,
Kai
I tried to use 2.3.1 alphamelts-py to stimulate magmatic processes. How could I set the suppress phase?
Moreover, in the app, we could find liquid temperature for wet or not, but we could not find that function in Python. Does that influence the calculation?
Many thanks.
Best,
Kai