Geochronology of Cretaceous and Paleogene granitic plutons in the Flint Creek Range, Montana and Blue Mountains, Oregon

U-Pb data are presented from the Philipsburg and Mount Powell batholiths in the Flint Creek Range of Montana, the Cornucopia Stock, Oregon, and a tabular intrusion in west-central Idaho. These data were collected to determine the crystallization ages of these plutons and constrain the timing of deformation and vertical axis rotation caused by island arc accretion and and associated movement on Mesozoic thrust faults in the Rocky Mountain foreland.

本文呈现了来自蒙大拿州弗林特溪山脉的菲利普斯堡岩基与鲍威尔山岩基、俄勒冈州的科纳科普亚岩株，以及爱达荷州中西部一处板状侵入体的铀铅（U-Pb）数据。收集这些数据旨在确定上述岩体的结晶年龄，并限定由岛弧增生及落基山脉前陆中生代逆冲断层相关运动所引发的变形与垂直轴旋转的时间。