Granite Pluton at the Panasqueira Tungsten Deposit, Portugal: Genetic Implications as Revealed from New Geochemical Data

Core samples recovered from exploration boreholes and granite/greisen outcrops at the Panasqueira world-class tungsten deposit in central Portugal were subjected to chemical analyses petrographic studies. We present a geochemical dataset trace element compositions of quartz micas large part unexposed granitic pluton. Our data suggest that hidden granite body is more complicated than previously believed. It consists flat cupola porphyritic with only traces mineralization Rio steep stock greisenized leucogranite surrounded by swarm quartz–muscovite veins rich wolframite between Barroca Grande Panasqueira. The contents W (Sn, Nb, Ta) muscovite markedly drop transition unmineralized greisen veins. was formed three principal stages: (1) intrusion two-mica accompanied local near-contact greisenization uncommon quartz–wolframite veinlets; (2) strongly fractionated formation apophyses; (3) circulation hydrothermal fluids deeper parts into cupola, greisenization, hydraulic fracturing opening structures outside ore