Significance of Ductile Shear Zones in the Implacement of Batholiths: Part I: Central Sierra Nevada, California

内华达州山脉中部的岩基是安第斯型岩浆岩， 弧，是侵位在一个覆盖大陆板块期间， 白垩 现代安第斯研究表明， 在俯冲作用产生的挤压应力下， 岩基只有岩浆叶理存在， 区域性固态叶理的实际缺失。 考虑到被认为是活跃的挤压场，这些 观测提出了有关动力场的问题 参加岩基的就位 该项目将 研究了韧性剪切带的几何学、运动学和应变特征， 剪切带在岩基和围岩，以建立其 在岩基动力和变形历史中的作用 炮位 研究结果有望揭示地壳上部 伴随深成岩作用的应力场和发育的组构应力场 在碰撞构造环境中。

The central Sierra Nevada batholith, an Andean-type magmatic arc, was emplaced in an overriding continental plate during the Cretaceous. Modern Andean studies imply the plate should be under compressional stress produced by subduction, however in the batholith only magmatic foliation is present and there is a virtual absence of regionally developed solid-state foliation. Given the compressional field thought to be active, these observations raise questions concerning the dynamic field attending emplacement of the batholith. This project will examine the geometry, kinematics and strain features of ductile shear zones in the batholith and wall rocks to establish their role in the dynamic and deformational history of batholith emplacement. Results are expected to shed light on upper crustal stress fields accompanying plutonism and in the fabrics developed in collisional tectonic environments.