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

使用变形带作为科罗拉多高原西南部区域构造应力模式的指南

• 批准号: 9406208
• 负责人: George Davis
• 金额: $ 12万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-01 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9406208&HistoricalAwards=false
• 关键词: Use; Deformation; Bands; Guide; Regional

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.

小行星9406208 科罗拉多高原是一大片相对未变形的岩石，但在塞维尔、拉腊米和第三纪时期，它远离一系列构造应力模式。 高原地层中富含多孔砂岩，其中应变小至0.1%的变形带形成。 由于这些是加工硬化特征，连续变形可能形成新的变形带组，而不是广泛地重新激活旧的变形带。 该项目将绘制适当岩性中的变形带图，并将其与已知年代的大型地物（断层）联系起来。 在空间相关之后，变形带所隐含的应力方向将由变形带方向反演，并产生一套科罗拉多高原的古应力模式。 结果应提供一个更好地了解的方向，规模和程度的本地化应力的这些事件在科罗拉多高原。