Thermodynamic Modeling of Magmatic Processes with alphaMELTS 2

Thermodynamic Modeling of Magmatic Processes with alphaMELTS 2

Dates: 23 – 25 November 2020, 10 am – 2 pm PST

Organizers: Paula Antoshechkina (Caltech), Paul Asimow (Caltech)

The MELTS family of algorithms is widely used by petrologists and geochemists to predict the outcomes of melting and crystallization processes, to compare with experiments or to design experimental campaigns, to assess the energy budgets of igneous processes, to teach the principles of igneous petrology, and more. Although there are a variety of ways to access such models, this workshop will focus on the newly released alphaMELTS 2 interface, and alphaMELTS for MATLAB/Python. alphaMELTS 2 is a text-based front end to the Rhyolite-MELTS, pMELTS, and pHMELTS models, with built-in trace element calculations and a variety of unique features and workflows. (Note that no commercial software is required for the workshop; access to alphaMELTS from MATLAB or Python is near-identical, so users may select one or the other.)

This workshop was originally intended to run as a two-day event prior to the 2020 Goldschmidt Conference. We have restructured the workshop to work online, so that it should still appeal to a wide range of users. Day 1 will focus on introductory material and basic functionality for new users but may also be of interest as a refresher for participants who have attended previous alphaMELTS workshops. Days 2 and 3 will focus on the latest features, more advanced or larger-scale calculations, and special problems suggested by attendees. The format will be flexible, so that participants will be able to concentrate on their areas of interest. Day 1 will constitute sufficient preparation for a novice to be able to appreciate the rest of the workshop. We also plan to offer a two-day workshop at the 2021 Goldschmidt Conference in Lyon, France, so participants will have a chance to follow up in person.

Instructors Paul Asimow and Paula Antoshechkina from Caltech are the designers and maintainers of alphaMELTS 2, and related software, and will cover software installation as well as some undocumented tricks that are important to getting reliable results from MELTS calculations.

Either MATLAB or Python is strongly recommended. Participants will need to sign up for GitLab ( to download the alphaMELTS 2 and alphaMELTS for MATLAB/Python software; details will be provided nearer the time.

The workshop will be recorded.


Member $80 $35
Non-member $90 $45


This workshop has reached capacity and registration is now closed.

Students and professionals from countries classified by the World Bank as having low-income or lower-middle-income economies may apply for free registration. Please contact us with your name, institution, and country to apply.

Geochemical Society members automatically receive the discounted member rates. European Association of Geochemistry (EAG) and Mineralogical Society of America (MSA) members can receive the discount by sending us a message with your name and society member number.

Code of Conduct

The GS strives to provide a respectful and comfortable learning environment for everyone who participates. By registering for the workshop, you agree to abide by the code of conduct.

Cancellation Policy

You may cancel your registration until 16 November 2020 for a refund, minus a processing fee of $25. No refunds will be made for cancellations made after 16 November. One substitution is allowed for no charge. To transfer your registration to someone else, please contact us.