Collaborative Research: Determining the 3D Kinematic Evolution of the Wyoming Laramide, Implications for Processes of Foreland Deformation

合作研究：确定怀俄明州拉拉酰胺的 3D 运动学演化，对前陆变形过程的影响

• 批准号: 0948692
• 负责人: W.A. Yonkee
• 金额: $ 10.05万
• 依托单位: Weber State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-15 至 2014-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0948692&HistoricalAwards=false
• 关键词: Collaborative; Research; Determining; 3D; Kinematic; Collaborative; Research; Determining; 3D; Kinematic

First-order outstanding questions regarding foreland deformation center on geodynamic processes that form diverse orientations of basement arches, mechanisms of basement deformation and its transfer to the sedimentary cover, and relationships to plate margin stresses. This project will integrate structural, anisotropy of magnetic susceptibility (AMS), and paleomagnetic studies of Laramide structures in Wyoming to test various tectonic models of foreland deformation. Testable models include, temporal changes in stress directions (possibly associated with flat-slab subduction), spatial variations in stress and fault orientations (potentially associated with basement anisotropy), and varying components of shear along differently oriented structures. Results of this project will further provide data on structural traps, fracture systems, and fault patterns within the Wyoming foreland, which will improve understanding of hydrocarbon reservoirs and potential sites for carbon dioxide sequestration. Finally, this collaborative investigation will be merged with ongoing paleomagnetic and structural studies of other orogens to compare processes of mountain building in different settings, and will generate large data sets for statistical comparisons of various strain and paleostress methods used in kinematic and mechanical analysis.The focus of this investigation will be on key structures that display a range of trends and deformation styles in the Wyoming foreland, and on two stratigraphic levels (Triassic redbeds and Jurassic limestone) that are well exposed, carry primary remanent magnetizations, and contain multiple strain markers. Characteristics of minor fault systems will be measured and analyzed to estimate paleostress patterns, strain orientations will be estimated from AMS fabrics and calcite twin analysis, and oriented cores will be drilled for paleomagnetic analysis to quantify timing and magnitudes of vertical-axis rotations. Characteristics of fracture patterns will be quantified for selected well-exposed surfaces to test relationships to fold and fault mechanics. By integrating multiple data sets, limitations of each set will be reduced. Critically, paleomagnetic data will be combined with deformation fabrics (minor faults, AMS, calcite twins, and fractures) and cross sections/3-D restorations to quantify both vertical-axis rotations and spatial-temporal changes in paleostress/strain. This project will provide an expansive data base, building on previous studies, in order to critically test kinematic models and mechanical processes of Laramide foreland deformation.

关于洞穴变形中心的一阶杰出问题，这些问题形成了地下室拱门的各种取向，地下室变形机制及其转移到沉积覆盖物以及与板缘应力的关系。该项目将整合磁化率（AMS）的结构，各向异性，以及Wyoming中Laramide结构的古磁研究，以测试前陆变形的各种构造模型。 可测试的模型包括应力方向的时间变化（可能与平板俯冲相关），应力和断层取向的空间变化（可能与基础各向异性相关）以及沿不同方向结构的剪切成分的变化。该项目的结果将进一步提供有关怀俄明州前陆上结构陷阱，断裂系统和断层模式的数据，这将提高对碳氢化合物储层的理解以及二氧化碳螯合碳的潜在地点。最后，这项协作研究将与其他Orogens的持续的古磁和结构研究合并，以比较不同环境中的山区建筑过程，并将生成大量数据集，以比较各种应变和古学生方法中使用的各种菌株和古生物学方法。该研究的重点将在趋势范围内呈现在趋势范围内的范围，并在趋势范围内进行差异，并将其展示为范围的差异。 （三叠纪红床和侏罗纪石灰石），曝光良好，携带原发性磁性并包含多个应变标记。将测量和分析次要断层系统的特征，以估算古肌模式，应从AMS织物和方解石双胞胎分析中估算应变取向，并将钻出定向的核心以进行古磁分析以量化垂直轴旋转的时间和大小。对于选定的暴露良好表面，将量化断裂模式的特征，以测试关系以折叠和断层力学。通过集成多个数据集，将减少每个集合的限制。至关重要的是，古磁数据将与变形织物（较小的断层，AMS，方解石双胞胎和裂缝）和横截面/3-D修复物结合使用，以量化垂直轴旋转和古生物/菌株的空间变化。该项目将在先前的研究基础上提供广泛的数据库，以批判性测试运动学模型和Laramide前陆变形的机械过程。