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

爱达荷州和蒙大拿州古近纪伸展的结构、年代学和地层学研究

• 批准号: 9317395
• 负责人: Susanne Janecke
• 金额: $ 14.5万
• 依托单位: Utah State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9317395&HistoricalAwards=false
• 关键词: Structural; Geochronologic; Stratigraphic; Studies; Paleogene

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 ***

9317395珍妮克这个项目将检验这一理论，即在始新世和渐新世时期，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，呈狭窄的北向半地块形式。结合40Ar-39Ar年代学的构造和地层分析，将确定该构造(S)的区域范围，以及它们是否是由于塞维尔造山带先前增厚的地壳的框架坍塌而形成的。研究结果将在全球造山系演化研究中得到广泛应用