Fig. 3: Pseudosections for starting compositions.
From: Metamorphism of Venus as driver of crustal thickness and recycling
Calculated pseudosections for the compositions (Table 2) of peridotite (A), basalt (B), and alkali basalt (C). Small phase fields are not labeled. Variance is shown by shading. Depth scale on the right y-axis is estimated using h = P/ρg (see text for limitations). Solid lines in different colors represent the thermal gradients of 5, 10, 15, 10, and 25 °C/km selected for this study. Conditions to the left of the thermal gradient of 5 °C/km are considered unattainable on Venus although some phase fields were extended into this area. The dashed magenta line represents the solidus. Mineral abbreviations (solid solutions capitalized): coe coesite, Cpx Clinopyroxene, Grt Garnet, Ilm Ilmenite, kls kalsilite, ky kyanite, lct leucite, nph nepheline, Ol Olivine, Opx Orthopyroxene, Pl Plagioclase, qz quartz, rt rutile, Spl Spinel, sti stishovite.
