COLLABORATIVE RESEARCH: The Cretaceous Strike-Slip Fault History of the Border Ranges Fault System: A Study of Translation and Transpression

合作研究：边界山脉断层系统的白垩纪走滑断层历史：平移和压扭研究

• 批准号: 9105499
• 负责人: Sarah Roeske
• 金额: $ 9.72万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-01 至 1993-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9105499&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Cretaceous; Strike; Slip

Strike-slip faulting has played a major role in the tectonic evolution of the northern Cordillera, however the timing, location and mechanisms of much of the strike-slip motion is not well established. Prior work has identified major dextral slip of Cretaceous age along the Border Ranges Fault, Alaska. Preliminary evidence indicates that the present level of erosion exposes the fault near the brittle-ductile transition at the time of motion. Recent models have proposed major subhorizontal detachments in strike-slip systems at this transition, in addition to the steep, strike-slip detachment normally envisioned. Because of the deep level of exposed crust and exceptional outcrop exposure this area affords the opportunity to test these models of the role of subhorizontal detachments in strike-slip shear zones. Results are expected to be applicable to many large-scale strike-slip zones.

走滑断层在构造运动中起着重要作用 北方科迪勒拉山脉的演变，然而， 许多走滑运动的机制尚不清楚 确立了习 先前的工作已经确定了主要的右旋滑动 阿拉斯加边境山脉断层沿着的白垩纪。 初步 有证据表明，目前的侵蚀程度暴露了 在运动时脆-韧性转变附近的断层。 最近的模型提出， 走滑系统在这个过渡，除了陡峭， 通常设想的走滑滑脱。 由于深 该地区的地壳暴露水平和异常露头暴露 提供了机会来测试这些模型的作用， 走滑剪切带中的近水平断层。 结果 有望适用于许多大型走滑带。