Tungsten ores in metamorphic rocks at the Jasenie-Kisla deposit (Slovakia)

The tungsten ores were deposited in previously metamorphosed rocks of the a mphybolite facies (migmatites, granite-gneisses, gneisses, and amphybolites ). The upper temperature limit of the metamorphism was attained at 670-720 degrees C, and, after this point, the progressive metamorphism changed for the regressive one. Then, metamorphic rocks underwent some metasomatic alte ration, and following altered rocks consequently formed: calcareous skarns (600-400 degrees C), biotite-feldspar rocks (520-325 degrees C), greisens ( 440-300 degrees C), and quartz-sericite-carbonate rocks (berezites) (350-20 0 degrees C). The tungsten ores are supposed to be genetically related to t he late Paleozoic granite intrusions, because the isotopic age of the alter ed wall rocks (333-328 Ma) is similar to that of the granodiorites, pegmath ites, and metamorphic rocks (345-334 Ma), and because the tungsten content regularly increases in the raw granodiorites-pegmathites-ore-bearing metaso matic rocks. Commonly, tungsten is concentrated in biotite-feldspar and qua rtz-sericite-carbonate rocks. The tungsten ores were deposited from moderat ely reduced, neutral, or slightly acid hydrothermal solutions with low sali nity and rather high CO2 content. During the ore deposition, the tungsten w as redistributed. The latest tungsten mineralization (colloform scheelite i n association with sulfides and somewhere with native gold) probably is of alpine age.