- 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
#41
General usage / Re: MELTS_Excel
Last post by Renqiang Liao - June 09, 2025, 06:59:29 PMDear Paula,
Thank you very much. It worked.
Best regards,
Renqiang
Thank you very much. It worked.
Best regards,
Renqiang
#42
General usage / Re: MELTS_Excel
Last post by Paula - June 09, 2025, 09:33:13 AMThe link to the latest version (currently 2024Jun18) is in this thread:
https://magmasource.caltech.edu/forum/index.php/topic,1053.msg1738.html#msg1738
Also on the alphaMELTS links page:
https://magmasource.caltech.edu/alphamelts/links.php
https://magmasource.caltech.edu/forum/index.php/topic,1053.msg1738.html#msg1738
Also on the alphaMELTS links page:
https://magmasource.caltech.edu/alphamelts/links.php
#43
General usage / MELTS_Excel
Last post by Renqiang Liao - June 09, 2025, 01:48:14 AMHi, everyone
Which is the latest MELTS_Excel version now? 2020Dec16 or 2024Jun18? The version 2020Dec16 shows "Server returned no results, giving up!". I read the message uploaded https://magmasource.caltech.edu/forum/index.php/topic,827.0.html, but it still does not work.
I saw a new version titled "MELTS_Excel 2024Jun18" on a social media, and this version seems to work. But the link "https://melts.ofm-research.org/excel.html" still is the version 2020Dec16. So I want to know where to download the version 2024Jun18.
Thanks in advance
Renqiang
Which is the latest MELTS_Excel version now? 2020Dec16 or 2024Jun18? The version 2020Dec16 shows "Server returned no results, giving up!". I read the message uploaded https://magmasource.caltech.edu/forum/index.php/topic,827.0.html, but it still does not work.
I saw a new version titled "MELTS_Excel 2024Jun18" on a social media, and this version seems to work. But the link "https://melts.ofm-research.org/excel.html" still is the version 2020Dec16. So I want to know where to download the version 2024Jun18.
Thanks in advance
Renqiang
#44
News and updates / Re: Melts Calculations Slowing...
Last post by Kai Wen - April 25, 2025, 02:58:04 PMHello，I am a new phd in cardiff uk, could you please help me how to use batch file
#45
The MELTS family of algorithms, and scientific discussion / Re: Modeling effect of xH2O on...
Last post by Paula - April 13, 2025, 10:35:24 AMThe problems with amphibole in MELTS are well-known and should not affect other phases e.g:
https://magmasource.caltech.edu/forum/index.php/topic,833.msg1420.html#msg1420
None of the constraints on the original MELTS model involved amphibole and so far as I know none of the rhyolite-MELTS ones did either. The rhyolite-MELTS calibration concentrated on the feldspar and quartz phase relations so I think you can consider those results to be reasonable reliable.
The amphibole project mentioned in the link above did not work out at the time due to Covid. But I am working on it a bit at the moment from the calibration data side - trying to get the experimental results that we have compiled for amphibole into the LEPR database (lepr.earthchem.org). And the ENKI group have been extending MELTS to include F, Cl and S. They will be demonstrating these and other exciting developments at Goldschmidt this summer:
https://conf.goldschmidt.info/goldschmidt/2025/meetingapp.cgi/Session/7308
https://magmasource.caltech.edu/forum/index.php/topic,833.msg1420.html#msg1420
None of the constraints on the original MELTS model involved amphibole and so far as I know none of the rhyolite-MELTS ones did either. The rhyolite-MELTS calibration concentrated on the feldspar and quartz phase relations so I think you can consider those results to be reasonable reliable.
The amphibole project mentioned in the link above did not work out at the time due to Covid. But I am working on it a bit at the moment from the calibration data side - trying to get the experimental results that we have compiled for amphibole into the LEPR database (lepr.earthchem.org). And the ENKI group have been extending MELTS to include F, Cl and S. They will be demonstrating these and other exciting developments at Goldschmidt this summer:
https://conf.goldschmidt.info/goldschmidt/2025/meetingapp.cgi/Session/7308
#46
The MELTS family of algorithms, and scientific discussion / Modeling effect of xH2O on fel...
Last post by jtepper - April 08, 2025, 08:37:22 PMI am using Melts 1.0.2 to constrain the water content of hypersolvus "A-type" granites. As one would expect, with low (<2 wt.%) H2O contents plagioclase appears late or not at all. Early crystallization of quartz and late crystallization of biotite are correctly modeled, but none of the runs produce Na-amphibole or aegerine, which are present some the rocks in minor (1-2 modal %) amounts (opx or fayalite appear instead). My question is whether it is reasonable to trust that the felspar results are broadly correct even if some of the mafic phase results are not. Any advice on this would be much appreciated. Thank you.
#47
The MELTS family of algorithms, and scientific discussion / Re: Can AlphaMELTS simulate th...
Last post by liushanke - April 07, 2025, 05:55:18 AMHi Paula,
Thanks for your message! It's interesting to hear about the work you've done fitting Li-bearing end members like alpha and beta spodumene, as well as Li₂SO₃, into the MELTS formulation. I can see how the lack of interaction parameters for Li₂SO₃ liquid with other MELTS liquid end members would be a challenge without experimental data on coexisting melts and Li-bearing phases.
I've recently come across some thermodynamic data for spodumene (both α- and β-forms) and lepidolite from Google search (Spodumene:https://journals.sagepub.com/doi/abs/10.1080/25726641.2020.1827675;https://www.mdpi.com/2075-163X/10/6/519. Lepiodlite:https://www.sciencedirect.com/science/article/pii/S0040603105002418), though I'm not sure if they include full compositional analyses of coexisting solid and liquid phases from experimental studies. However, these seem more focused on the solid phases rather than melt compositions. I'd be happy to keep an eye out for experimental studies that report compositions of all coexisting phases (solid and liquid) during my regular literature searches. If I find anything relevant—especially with spodumene or other Li-bearing phases like lepidolite—I'll let you know so we can consider queuing them for inclusion in LEPR.
Regards, Shanke
Thanks for your message! It's interesting to hear about the work you've done fitting Li-bearing end members like alpha and beta spodumene, as well as Li₂SO₃, into the MELTS formulation. I can see how the lack of interaction parameters for Li₂SO₃ liquid with other MELTS liquid end members would be a challenge without experimental data on coexisting melts and Li-bearing phases.
I've recently come across some thermodynamic data for spodumene (both α- and β-forms) and lepidolite from Google search (Spodumene:https://journals.sagepub.com/doi/abs/10.1080/25726641.2020.1827675;https://www.mdpi.com/2075-163X/10/6/519. Lepiodlite:https://www.sciencedirect.com/science/article/pii/S0040603105002418), though I'm not sure if they include full compositional analyses of coexisting solid and liquid phases from experimental studies. However, these seem more focused on the solid phases rather than melt compositions. I'd be happy to keep an eye out for experimental studies that report compositions of all coexisting phases (solid and liquid) during my regular literature searches. If I find anything relevant—especially with spodumene or other Li-bearing phases like lepidolite—I'll let you know so we can consider queuing them for inclusion in LEPR.
Regards, Shanke
#48
The MELTS family of algorithms, and scientific discussion / Re: Can AlphaMELTS simulate th...
Last post by Paula - April 06, 2025, 09:50:56 AMThere aren't any Li-bearing species in the main MELTS thermodynamic database. We did fit some Li-bearing end members with the MELTS / Berman formulation a few years back, including alpha and beta spodumene, and Li2SO3 solid and liquid. To calibrate the interaction parameters between Li2SO3 liquid and the other MELTS liquid end members would require some experimental data for coexisting melt and Li-bearing phases though.
I just checked LEPR (lepr.earthchem.org) and there are no spodumene analyses there. There's minor amounts of LiO2 in cordierite and amphibole but neither of those phases are well-modeled in MELTS. Do you know of any experimental studies where compositions are analyzed for all coexisting phases, both solid and liquid? We could get them queued for inclusion in LEPR.
Paula
I just checked LEPR (lepr.earthchem.org) and there are no spodumene analyses there. There's minor amounts of LiO2 in cordierite and amphibole but neither of those phases are well-modeled in MELTS. Do you know of any experimental studies where compositions are analyzed for all coexisting phases, both solid and liquid? We could get them queued for inclusion in LEPR.
Paula
#49
The MELTS family of algorithms, and scientific discussion / Can AlphaMELTS simulate the fo...
Last post by liushanke - April 04, 2025, 02:34:03 AMHi everyone,
I'm trying to figure out if AlphaMELTS can be used to model the crystallization of spodumene (LiAlSi₂O₆) from a lithium-rich melt, such as in a pegmatite system. I understand that AlphaMELTS relies on the MELTS thermodynamic database, but I'm unsure if it includes sufficient data for lithium-bearing minerals like spodumene.
Alternatively, if spodumene isn't well-supported in the MELTS database, are there any workarounds or additional tools you'd recommend?
Any insights or experiences would be greatly appreciated! Thanks in advance!
Regards, Shanke
I'm trying to figure out if AlphaMELTS can be used to model the crystallization of spodumene (LiAlSi₂O₆) from a lithium-rich melt, such as in a pegmatite system. I understand that AlphaMELTS relies on the MELTS thermodynamic database, but I'm unsure if it includes sufficient data for lithium-bearing minerals like spodumene.
Alternatively, if spodumene isn't well-supported in the MELTS database, are there any workarounds or additional tools you'd recommend?
Any insights or experiences would be greatly appreciated! Thanks in advance!
Regards, Shanke
#50
Magma chamber processes / Re: Magmatic mixing, isenthalp...
Last post by Paula - April 01, 2025, 12:16:50 PMThe Assimilant filename is Enrichment.melts.
As described in the ALPHAMELTS_ASSIMILATE documentation you can have a single file or multiple files. That forum thread was about adding the option to have multiple files, but you can still have just 1 file.
See: https://magmasource.caltech.edu/alphamelts/1/manual_text.html#0.1__Toc192218456 (that link is from an older version but it's not changed significantly in the v1.9 pdf).
Magnetite is part of the spinel solid solution, and ilmenite is part of the rhombohedral oxide solid solution (see: https://magmasource.caltech.edu/forum/index.php/topic,85.0.html). If you are not getting spinel crystallizing then try suppressing rhm-oxide or change the fO2.
Check the MELTS file section of the documentation (https://magmasource.caltech.edu/alphamelts/1/alphamelts_manual.pdf) for the fO2 format. In alphaMELTS 1.9 you can specify non-integer offsets with "Log fO2 Delta:". Note that in alphaMELTS 2 that line is replaced by "Log fO2 Offset:" for more consistency other MELTS software.
As described in the ALPHAMELTS_ASSIMILATE documentation you can have a single file or multiple files. That forum thread was about adding the option to have multiple files, but you can still have just 1 file.
See: https://magmasource.caltech.edu/alphamelts/1/manual_text.html#0.1__Toc192218456 (that link is from an older version but it's not changed significantly in the v1.9 pdf).
Magnetite is part of the spinel solid solution, and ilmenite is part of the rhombohedral oxide solid solution (see: https://magmasource.caltech.edu/forum/index.php/topic,85.0.html). If you are not getting spinel crystallizing then try suppressing rhm-oxide or change the fO2.
Check the MELTS file section of the documentation (https://magmasource.caltech.edu/alphamelts/1/alphamelts_manual.pdf) for the fO2 format. In alphaMELTS 1.9 you can specify non-integer offsets with "Log fO2 Delta:". Note that in alphaMELTS 2 that line is replaced by "Log fO2 Offset:" for more consistency other MELTS software.