Mineral compositions and reaction textures found in migmatitic gneisses from near Gilsum, New Hampshire, constrain both peak metamorphic pressure (P) and temperature (T) conditions and the PT path. Large K-feldspar porphyroblasts indicate isobaric heating of the samples at P < 4 kb (Spear et al. 1999), and relict cordierite + garnet assemblages record the occurrence of biotite vapor-absent melt...

Abstract Although the evolution of residual melts in magmatic systems controls their eruptability and ore-forming potential, compositions are obscured plutonic rocks by a protracted near-solidus absence interstitial glass. Here, we trace melt from Strontian Intrusive Complex, Scotland, using element chemistry amphiboles, titanites which intergrown with amphibole rims. Laser ablation mapping rev...

The Late Aptian Rajmahal Traps originated through Kerguelen-Plume-related volcanism at the eastern margin of Indian Shield. Clinopyroxene and whole-rock thermobarometry reveals that magmas crystallized P-T conditions ≤~5 kbar/~1100–1200 °C. These pressures correspond to upper crustal depths (≤~19 km). Modeling shows primary were last in equilibrium with mantle ~9 kbar/~1280 corresponding (~33 k...