Structural, Kinematic, and Geochronologic Study of a Major Intraarc Strike-Slip Fault, Eastern Sierra Nevada, California

加利福尼亚州内华达山脉东部主要弧内走滑断层的结构、运动学和年代学研究

• 批准号: 9118167
• 负责人: Richard Schweickert
• 金额: $ 11.35万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 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: 1991-11-01 至 1995-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118167&HistoricalAwards=false
• 关键词: Structural; Kinematic; Geochronologic; Study; Major

The Sierra Nevada batholith was emplaced in a Mesozoic continental arc setting in which oblique convergence should have caused dextral transcurrent motion. Such motion has been difficult to demonstrate due to the level of exposure; however evidence for such a fault having 400 km of displacement has recently been documented in a series of roof pendant preserved in the Sierra Nevada. This project will map the candidate fault in the roof pendants and associated shear zones in the batholith in order to constrain the kinematic history. Samples will also be dated to put temporal constraints on the movement. Results are of considerable significance in Mesozoic plate motions of the area and on the nature of intrabatholithic strike-slip faults.

内华达山脉岩基位于中生代陆弧环境中，斜向会聚应引起右旋横流运动。由于暴露的程度，这种运动很难证明；然而，最近在内华达山脉保存的一系列屋顶悬垂中记录了这种断层有400公里位移的证据。该项目将绘制屋顶悬垂中的候选断层图和岩基中相关的剪切带，以约束运动学历史。还将对样品进行年代测定，以对移动施加时间限制。研究结果对该区中生代板块运动和石器内走滑断裂的性质具有重要意义。