α alphaMELTS is developed and maintained by Paula Antoshechkina and Paul Asimow at Caltech. The alphaMELTS front-end is a fork of the MELTS software hosted at OFM Research and benefits from regular source code updates from Mark Ghiorso. The alphaMELTS program includes a number of features not available in the graphical user interfaces (GUI), including the pHMELTS algorithm. The newest MELTS variant, Rhyolite-MELTS, is currently available only as a downloadable version of the GUI program or as one of the models underlying PhasePlot (together with pMELTS). The following is a summary of the whos, wheres and whats:
The pHMELTS model (A2004) is based on the MELTS (GS1995) and pMELTS (G2002) algorithms. Rhyolite-MELTS (G2011) is also based on the MELTS liquid model. xMELTS (G2007) is the next generation MELTS model, which greatly expands the covered range of P-T conditions. The original NSF award lead to the development of the LEPR database and a provisional silicate liquid model. An ARRA-funded collaboration between the three of us, together with then PhD candidate Emily Hamecher (now at Cal State, Fullerton), sought to extend and improve the thermodynamic solution models used with xMELTS (specifically garnet and pyroxenes, but also spinel). This work is ongoing and updated solid solution models are being made available at the Supplemental calculator link, as and when they are accepted for publication. For more information on the intended scope of the xMELTS model, once it is finalized, see the 5th FAQ on Mark's MELTS homepage.