Geochronological systematics of the Huayna Potosi and Zongo granitic plutons, Cordillera Real of Bolivia, by the K/Ar, Rb/Sr and U/Pb methods - Cordani, Umberto G.; Iriarte Ibanez, Alvaro Rodrigo; Sato, Kei (South American Symposium on Isotope Geology, 2018)