U-PB shrimp zircon ages of charnockites of alto Candeias intrusive suite, Rondônia, Brazil: implications for the magmatism related to the Rondonian-San Igancio Orogeny - Payolla, Bruno Leonelo; Bettencourt, Jorge Silva; Leite Junior, Washington Barbosa; Sato, Kei (South American Symposium on Isotope Geology, 2012)