Petrochronology of the magmatic-hydrothermal transition in volatile-rich plutons: Integrated multi-mineral investigations of the Taca-Taca batholith, Famatinian Arc

This thesis investigates the magmatic-hydrothermal transition in the Taca-Taca batholith (Puna Plateau, NW Argentina), using petrochronology, mineral chemistry, and field data. It reveals protracted magma evolution from 510–470 Ma, followed by exsolution of F–CO₂-rich hydrothermal fluids from crystallizing magma and multi-stage hydrothermal alteration from 470 to 440 Ma. The Taca-Taca batholith is a shallow (2 kb) and volatile-rich system, recording the interaction of this F-CO2-rich hydrothermal fluid with melt and crystals, forming diverse and uncommon microstructures, such as late-magmatic pockets, filled miaroles, and interstitial fluorite-K-feldspar aggregates, all associated with magmatic epidote.