The Papoose Flat Pluton: A Microstructural and Petrofabric-Based Analysis of Deformation Processes Associated with the Forceful Intrusion of a Granitic Pluton

Papoose 平坦岩体：对与花岗岩岩体强力侵入相关的变形过程进行微观结构和基于岩石组构的分析

• 批准号: 9018929
• 负责人: Richard Law
• 金额: $ 8.56万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-02-15 至 1994-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9018929&HistoricalAwards=false
• 关键词: Papoose; Flat; Pluton; Microstructural; Petrofabric

Spatial and temporal variations in strain path and shear sense associated with emplacement will be documented for the Papoose flat pluton of eastern California. This pluton has been considered a classic example of forceful emplacement in a coaxial strain field on the basis of earlier petrographic studies of the pluton's marginal facies and its surrounding country rocks. Recent reevaluation of the published petrofabric data from the pluton shows, however, that a uniform sense of asymmetry exists in the fabric diagrams that is consistent with pluton emplacement during large scale non-coaxial shearing. Microstructural and crystallographic fabric criteria will be used with data from rotated porphyroblasts and contract metamorphic mineral assemblages to determine the strain path, temperature and shear sense during pluton emplacement. The kinematic and deformation processes operative will thus be determined and these data will constrain the possible mechanisms of pluton emplacement. The results of this study will greatly improve our understanding of pluton emplacement mechanisms in general, and will also provide a much needed link between naturally produced deformation microstructives and those produced experimentally and by computer simulation studies.

应变路径和剪切方向的时空变化 将为帕普斯平原记录与安置有关的资料 产于加州东部的一种深岩体。 该岩体被认为是 在同轴应变场中强制就位的典型例子 根据早期对该岩体的岩相学研究， 边缘相及其围岩。 最近 对已发表的岩体岩石组构数据的重新评价 显示，然而，一个统一的意义上的不对称存在于 组构图与岩体侵位过程一致， 大规模非同轴剪切 微结构和 晶体学组构标准将与来自 旋转变斑晶和收缩变质矿物组合 以确定应变路径、温度和剪切方向， 岩体侵位 运动学和变形过程 因此，将确定操作，并且这些数据将约束 岩体侵位的可能机制 的结果 研究将大大提高我们对岩体侵位的认识 一般机制，并将提供一个非常需要的联系 自然产生的变形微结构和那些 通过实验和计算机模拟研究产生。