TY - RPRT TI - 40Ar/39Ar Geochronology, Isotope Geochemistry (Sr, Nd, Pb), and petrology of alkaline lavas near Yampa, Colorado: migration of alkaline volcanism and evolution of the northern Rio Grande rift AU - Michael A. Cosca AU - Ren A. Thompson AU - John P. Lee AU - Kenzie J. Turner AU - Leonid A. Neymark AU - Wayne R. Premo PY - 2014 DO - 10.1130/ges00921.1 UR - https://pubs.usgs.gov/publication/70101155 ID - 70101155 ER -