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

[406208 .戴维斯]科罗拉多高原是一大片相对未变形的岩石，但在Sevier、Laramide和第三纪的一系列构造应力模式中处于远端。高原地层具有丰富的多孔砂岩，其变形带的应变小至0.1%。因为这些都是加工硬化的特征，连续的变形很可能形成新的变形带，而不是广泛地激活旧的变形带。该项目将在合适的岩性中绘制变形带，并将其与已知年龄的大型特征（断层）联系起来。经过空间关联后，将变形带所隐含的应力方向与变形带方向进行反演，得到一套科罗拉多高原古应力模式。研究结果将有助于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.