Figure 4
From: The Quaternary Kurobegawa Granite: an example of a deeply dissected resurgent pluton
Temperature and pressure estimates for the Kurobegawa Granite. (a) Calculated zircon saturation temperature (TZrn) vs apatite saturation temperature (TAp) using the KRW sample (Fig. 3) and data from Wada et al.23 (b) Pressure vs temperature for various amphibole (Amp)-plagioclase (Pl) pairs in MMEs. We grouped four Amp-Pl pairs based on total Al content (atoms per formula unit: apfu) in Amp and anorthite (An) content in Pl. Temperatures were calculated using the Amp-Pl thermometer of Molina et al.27 for groups 1 and 2 and Holland and Blundy28 for groups 3 and 4. Pressures were estimated using the Al in amphibole barometer29. The pressure range by the Al in sphene (Sph) barometry30 and the temperature range by apatite (Ap) saturation thermometry are also plotted. The red dotted line shows the experimentally determined water-saturated solidus for tonalite31 and the red solid line is the water-saturated solidus calculated using rhyolite-MELTS for diorite32. The transparent-grey area represents the proposed optimal emplacement window of shallow magma chambers (P = 2 ± 0.5 kbar), estimated using thermo-mechanical models33.
