GEOCRONOLOGíA U-Pb DE LOS CUERPOS PORFIRITICOS DEL DISTRITO AURíFERO DE VETAS- CALIFORNIA (DPTO DE SANTANDER, COLOMBIA).

two riodacite porphyry bodies, located in the central sector of the santander massif (cordillera oriental), were dated by u-pb method, using the la-mc-icpms technique: multicollector-laser ablation-inductively coupled plasma-mass spectrometer. the obtained ages (8.4 ± 0.2 and 9.0 ± 0.2 ma), evidences a magmatic phase during the late miocene (tortoniano), which took place during the andean orogeny. the identifcation of this magmatic pulse, in addition to provide new information on the geological history of the santander massif, deserves special attention, from the point of view of mineral deposit exploration, considering that rocks with the same age and features are related to the formation of important magmatic-hydrothermal deposits, as has been recognized in other regions of the andean orogenic system.