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

晚白垩世-早第三纪的巧克力山逆冲是加利福尼亚东南部一个主要的、广泛的断裂带的一部分，该断裂带将前寒武纪至中生代的片麻岩置于白垩纪高压/低温片岩之上。运输方向是东北向，这被用来帮助重建白垩纪时期科迪勒拉山脉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，包括巧克力山逆冲断层，可能已经被重新激活，因此它们可能代表了挖掘作用，而不是俯冲和埋藏构造作用。本项目将通过构造岩石学和变质岩石学的详细野外工作来解决这一争议。这一结果将为科迪勒拉西南地区中生代至第三纪的板块重建提供有意义的依据，并将对其他主要造山带类似的构造环境产生启示。

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.