Trip G: A Permian magmatic-hydrothermal system with tungsten-fluorine mineralization in SW Connecticut: Evidence for...

The fluorine-rich, Permian Pinewood Adamellite (granitic stock) and two other minor Permian intrusions (dacite and rhyolite porphyries) define a ~10-km-long, 310°-trending belt in southwestern Connecticut. Zoned, high-temperature, hydrothermal veins, also trending 310°, with relatively simple bulk mineralogy (primarily quartz + muscovite with minor feldspars and fluorite) cut the undeformed Pinewood stock. Further northwest at Old Mine Park (OMP), Trumbull, Connecticut, similarly-trending, zoned veins with more diverse mineralogy (quartz + muscovite + fluorite ± topaz ± albite) cut high-grade, Acadian metamorphic rocks. The greater variety and quantity of additional volatile-bearing minerals in veins at OMP and the associated metasomatic alteration of the host amphibolite to clinozoisite ± quartz ± scheelite resembles a plutonic hydrothermal cap, suggesting the presence of another intrusive body, geochemically related to the Pinewood stock, at depth along the trend. This trip will examine the structural and mineralogical relationships between the Pinewood pluton and OMP, as well as…