Previous studies demonstrated that melting, initiated by supercritical fluids in the 375–400 °C range, occurred as part of anthracite metamorphism Appalachian Basin. Based on known behavior vitrinite at high temperatures and, to a lesser extent, pressures, it was determined duration heating, and resolidification event about 1 h. In current study, featureless within banded maceral assemblages de...

Empirical studies of zircon in migmatites document features compatible with growth during heating at suprasolidus conditions. However, numerical modelling behaviour suggests that is expected to grow only cooling and melt crystallization. Here, phase equilibrium coupled mineral–melt Zr partitioning used an attempt reconcile the observations from predictions previous models anatectic systems. In ...

[1] The current structure of the South Armorican Domain in the French Variscan Belt, provides an excellent record of the late orogenic evolution, as documented by the complex interactions between extensional structures and partial melting. In the Golfe du Morbihan, the South Brittany Migmatite Belt (SBMB), tectonically overlain by non‐melted metamorphic units, was studied by combined structural...

First posted October 28, 2022 For additional information, contact: Director, Florence Bascom Geoscience CenterU.S. Geological Survey926A National Center12201 Sunrise Valley DriveReston, VA 20192Contact Pubs Warehouse The bedrock geology of the 7.5-minute Crown Point quadrangle consists deformed and metamorphosed Mesoproterozoic gneisses Adirondack Highlands unconformably overlain by weakly lowe...