Use of Deformation Bands as a Guide to Regional Tectonic Stress Patterns within the Southwestern Colorado Plateau

9406208戴维斯科罗拉多高原是一大片相对未变形的岩石，但在塞维尔、拉莱姆和第三纪时期，它是一系列构造应力模式的远端。高原地层富含疏松砂岩，形成变形带，应变小至0.1%。由于这些都是加工硬化特征，连续变形可能会形成新的变形带，而不是广泛地重新激活旧的变形带。该项目将绘制合适岩性的变形带图，并将它们与已知时代的大特征(断层)联系起来。经过空间对比，变形带所隐含的应力方向将从带方向反转，并产生一套科罗拉多高原的古应力模式。这些结果应该能更好地了解科罗拉多高原这些事件的应力方向、强度和局部化程度。

9406208 Davis The Colorado Plateau is a large area of relatively undeformed rock that nevertheless was distal to a series of tectonic stress patterns during Sevier, Laramide and Tertiary time. The plateau stratigraphy is rich in porous sandstones in which deformation bands form with strains as small as 0.1%. Because these are work- hardening features, successive deformations are likely to form new sets of deformation bands rather than extensively reactivate old ones. This project will map deformation bands in suitable lithologies and related them to large features (faults) of known age. After spatial correlations, the stress orientations implied by the deformation bands will be inverted from band orientations and a set of paleostress patterns for the Colorado Plateau produced. Results should provide a much better understanding of the directions, magnitude and degree of localization of stress of these events in the Colorado Plateau.