Project SAGUARO: Seismic Structure and Geology Under Arizona's Regional Orogens

SAGUARO 项目：亚利桑那州区域造山带下的地震结构和地质

• 批准号: 9206055
• 负责人: Thomas Henyey
• 金额: $ 36.42万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9206055&HistoricalAwards=false
• 关键词: Project; SAGUARO; Seismic; Structure; Geology

The Southern Basin and RAnge contains one of the Cordillera's most important and enigmatic Cenozoic tectonic regimes - the highly extended terrane consisting of a series of metamorphic core complexes and detachment fault structures along the southwestern margin of the Colorado Plateau. This terrane, a 25,000 km2 region known as the Whipple domain constitutes the largest tilt-block domain within the Southern Basin and Range and is characterized by west-tilted fault blocks and east- to northeast-dipping normal faults. This is a project to delineate, in three dimensions, the structural elements of t he Whipple domain and its a boundaries. This study will pay particular attention to subsurface tectonic configurations and spatial relationships as provided by seismic reflection profiles and will be "ground-truthed" by field observations. The seismic data base consists of 27 generally high- quality proprietary industry seismic reflection profiles (1400 km) line length) which are already resident at USC or for which we have received permission to obtain. These data will greatly expand upon the results of earlier CALCRUST work in the Whipple Mountains, and the portions of the COCORP and PACE transects which pass through the Whipple domain. The Whipple domain probably represents the most complete and contiguous overall exposure of the various structural elements of the Cordilleran highly extended terrane.

南部盆地和山脉包含了科迪勒拉最重要和最神秘的新生代构造体系之一——科罗拉多高原西南边缘由一系列变质核杂岩和滑脱断裂构造组成的高度伸展的地体。该地体面积为2.5万平方公里，被称为惠普尔域，是南盆地和山脉内最大的倾块体域，其特征是断块向西倾斜，正断层向东至东北倾斜。这是一个在三维空间中描绘惠普尔域及其边界的结构元素的项目。这项研究将特别关注地震反射剖面所提供的地下构造配置和空间关系，并将通过实地观测“实地验证”。地震数据库由27个高质量的专有工业地震反射剖面（1400公里）组成，这些剖面已经在南加州大学居住，或者我们已经获得许可获得。这些数据将大大扩展早期在惠普尔山脉的CALCRUST工作的结果，以及COCORP和PACE横断面穿过惠普尔域的部分。惠普尔域可能代表了科迪勒拉高度伸展地体中各种构造元素最完整、最连续的整体暴露。