Thermodynamic Modeling of Volcanic Systems with alphaMELTS 2
This is the home page for the two day workshop, originally to be held at the IAVCEI 2021 meeting but postponed to 2023;
for the NSF sponsored two to three day workshops held at Caltech, and elsewhere, please see the
alphaMELTS NSF workshops page.
We are pleased to announce a two day workshop on the use of MELTS software
for calculation of phase equilibria and tracking of trace elements during igneous processes.
The MELTS family of algorithms are 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 geochemistry, and more.
This short course will introduce users to the full range of MELTS models, illustrate the capabilities
and potential applications of individual models, demonstrate the available interfaces, and give participants
first hand experience running the software and tools. This workshop will differ from previous alphaMELTS workshops
in emphasizing modeling of volcanic systems, including vapor saturation, and magma chamber processes. We will focus
on the newly released alphaMELTS 2 (text-based) interface and access to alphaMELTS from MATLAB, Python, and
R programming environments, but will also introduce other popular MELTS software, such as Thermoengine, MELTS for
Excel and the Magma Chamber Simulator.
Title: Thermodynamic Modeling of Volcanic Systems with alphaMELTS 2 Organizers: Paula Antoshechkina, Paul Asimow (Caltech) Date: January 28th - 29th, 2023, 9.00AM - 5.00PM each day Venue: Room TBD, Registration fee for two days: 160 NZD (full price) / 60 NZD (Early Career Researchers†),
per particpant; payable by credit/debit card Early registration deadline for IAVCEI conference: November 20th, 2022
†Students, postdocs, and/or research scientists who would have been within 7 years of their PhD
(not including parental or other leave) when the conference was originally scheduled to go ahead in 2021.
Participants who have an IAVCEI grant to attend the conference can apply for a fee waiver for the workshop.
The 60 / 160 NZD fee includes refreshments and lunch for each day.
We intend to cover a range of topics during the workshop, including:
Background to, and strengths and limitations of the general computational phase equilibria approach
Comparison of MELTS models (rhyolite-MELTS 1.0.2, 1.1.0, 1.2.0; pMELTS; pHMELTS) and suitability for particular
Common errors in running the models and important ways to apply them efficiently and accurately
Introduction to alphaMELTS 2 and the alphaMELTS for MATLAB/Python interfaces
Quick overview of other interfaces available (MELTS for Excel, MagmaSat, and the Magma
Chamber Simulator) and how alphaMELTS software fits in with them
The trace element engine in alphaMELTS, including the expanded D(P,T,X) functionality of alphaMELTS 2.
traceDs a database of experimental studies involving trace element distribution between liquid, solid
and fluid phases, and how to use traceDs search results in alphaMELTS 2.
Brief discussion of the next generation of models and planned extensions to the existing interfaces
Talks describing the models and software will be kept brief to allow more time for first hand experience with
the software. Particular features will be higlighted on the platforms for which they are most convenient (e.g.
alphaMELTS for trace elements; alphaMELTS for MATLAB/Python for open system behavior). Application to magma chamber processes
and mantle melting will be discussed, and short demonstrations will be included as illustrations. Examples
from the introductory sessions will be expanded on, and some special calculations will highlight features that are
only available (or only convenient) on individual platforms.
The approximate schedule will be posted nearer the time.
*Note that having access to MATLAB is not a requirement for participation. The data visualization part of
the exercises will be possible in MATLAB Online, which we hope to have a workshop license for. Python (or possibly R) alternatives
for each exercise will be available, if needed; the MATLAB and Python interfaces to alphaMELTS are near-identical.
We will also have time for Q&A with individual workshop
organizers to address participants' particular interests during the break-out sessions. Please feel free to
bring examples that you would like us to look at. This could be a calculation that you have attempted
that does seem to work or simply a composition (major elements in wt% or grams of oxides; trace elements,
optional for alphaMELTS, in ppm) and conditions that you would see calculated.
Links to example files, from a 3-day workshop, are available by clicking the Links tab above (since previous 1- and 2-day in-person
workshops at Goldschmidt conference using alphaMELTS 1.9, we are updating to the newer alphaMELTS 2 format). The files will be updated
nearer the time of this workshop. Some examples (such as MORB crystallization) will be provided for more than one
front-end, so that you can see similarities and differences.
Links to software front-ends that will be demonstrated at the workshop are available by clicking the Links tab above.
If you decide to install the software in advance, you can test the installation using the appropriate 'Quick Start using MELTS'
tutorial example; otherwise there will be plenty of opportunity during the workshop to install the software of your choice, with help
from the organizers.
Paula Antoshechkina (née Smith) is
an Associate Research Scientist at Caltech. She is responsible for most of the alphaMELTS front-end, forum and
MAGMA website. At the moment she is focused on pMELTS+CO2 and other calibrations, libalphaMELTS
and libpHMELTS interfaces, and various projects that fit between the tools
available on the ENKI portal and traditional MELTS software.
Paul Asimow is Professor of Geology
and Geochemistry at Caltech. He developed pHMELTS and many of the tools since incorporated into alphaMELTS.
He has supervised a number of students and postdocs with MELTS-related projects, both to extend and improve
the underlying thermodynamic models and to apply the software to real world magmatic processes. He is
also involved in shock-wave experiments and theoretical calculations on silicate liquid and minerals.