Extended Data Fig. 3: THERMOCALC pressure–temperature pseudosections of open-system models.
From: Deep, ultra-hot-melting residues as cradles of mantle diamond
Hybrids #1 (a) and #2 (b) are 1:2 mixtures of experimental AUK22,46 with Ext2 of the incremental model. Hybrid #3 (c) uses the more refractory Ext2.5 composition at a 1:4 ratio (see Methods for details). The pyroxene structure stabilized by THERMOCALC is sensitive to compositional ‘starting guesses’ illustrated in a and b, in which low-Ca clinopyroxene and high-Ca orthopyroxene have the same composition and are effectively interchangeable.
