SHRIMP U-Pb and 40Ar/39Ar age constraints for relating plutonism and mineralization in the Boulder batholith region, Montana - Lund, Karen; Aleinikoff, John; Kunk, Michael; Unruh, Daniel M.; Zeihen, G.; Hodges, W.; du Bray, Edward; O’Neill, J. (Economic Geology, 2002)