Structural and Metamorphic Evolution of the Chocolate Mountains, Thrust, Southeasternmost California

加利福尼亚州最东南部的图拉斯特巧克力山的结构和变质演化

• 批准号: 9316916
• 负责人: Carl Jacobson
• 金额: $ 4.33万
• 依托单位: Iowa State University
• 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: 1994-01-01 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316916&HistoricalAwards=false
• 关键词: Structural; Metamorphic; Evolution; Chocolate; Mountains

9316916 Jacobson The Late Cretaceous-early Tertiary aged Chocolate Mountains thrust is part of a major, extensive fault zone in SE California that places Precambrian to Mesozoic gneisses over Cretaceous high pressure/low temperature schists. The transport direction is toward the NE and this has been used to help reconstruct a large part of the SW Cordillera during Cretaceous times. Recent work has shown that several sections of this major fault zone, including the Chocolate Mts. thrust, may have been reactivated and that they therefore may represent exhumation rather than subduction and burial tectonism. This project will resolve the controversy by detailed field work with structural and metamorphic petrology. The results will allow meaningful plate reconstructions for the Mesozoic to Tertiary in the SW Cordillera, and will have implications for similar tectonic settings in other major orogenic belts.

9316916雅各布森晚白垩世-早第三纪的巧克力山逆冲断层是加利福尼亚州东南部一条主要的广泛断裂带的一部分，该断裂带将前寒武纪至中生代片麻岩置于白垩纪高压/低温片岩之上。输送方向是朝向东北方向，这已经被用来帮助重建白垩纪时期科迪勒拉西南部的大部分地区。最近的研究表明，这一主要断裂带的几个部分，包括巧克力山。因此，它们可能代表了折返，而不是俯冲和埋藏构造作用。该项目将通过与构造和变质岩石学的详细野外工作来解决争议。这一结果将使科迪勒拉西南部中生代至第三系的板块重建具有意义，并将对其他主要造山带的类似构造环境产生影响。