Structural, Geochronologic and Stratigraphic Studies of Paleogene Extension, Idaho and Montana

Janecke这个项目将检验始新世和渐新世时期的理论，即在蒙大拿州西南部和爱达荷州中东部之间存在一个基本的构造边界，以一个狭窄的N向半地堑的形式存在。结合40Ar / 39Ar年代学对半地堑及其沉积充填体进行构造和地层分析，将确定该构造的区域范围，以及它们是否由于塞维尔造山带先前增厚的地壳的牵引崩塌而形成。研究结果对世界范围内造山带的演化具有广泛的应用价值

9317395 Janecke This project will test the theory that in Eocene and Oligocene times there was a fundamental tectonic boundary, between what is how SW Montana and east-central Idaho, in the form of a narrow, N- trending half-graben. Structural and stratigraphic analyses of the half-graben and its sedimentary fill combined 40Ar\39Ar geochronology will ascertain the regional extent of the structure (s) and whether or not they formed due to fraintational collapse of previously thickened crust in the Sevier orogenic belt. The results will have wide application to the evolution of orogenic systems world-wide ***