Deciphering progressive deformation on quartz veins by means of fluid inclusions and cathodoluminescence

SOSA, GRACIELA M.; VAN DEN KERKHOF, ALFONS; OYHANTCABAL, PEDRO; WEMMER, KLAUS; ORIOLO, SEBASTIÁN

Conferencia; European current research on fluid and melt inclusions; 2021

Fluid inclusion and cathodoluminescence (CL) are powerful tools to reconstruct the times and rates at which progressive deformation operates. In the southernmost Late Neoproterozoic Dom Feliciano Belt, Uruguay, the pressure-temperature-deformation-fluid activity-composition-time (P-T-D-A-X-t) path of vein-type gold deposits was reconstructed (Fig. 1, Sosa et al., 2020). The quartz veins are hosted in Paleoproterozoic dolomitic marble and formed along fold hinges and sheared marble bands in an Ediacaran transpressional regime. They are associated with a post-collisional magmatism and hydrothermal fluid circulation. K-Ar muscovite dating constrained an age of 592.8 ± 8.7 Ma for the veins, being thus coeval with widespread shear zone activity in the belt.