Interactions between Deformation and Metamorphism: Controls on Shear Zone Rheology and Metamorphic Memory

Selverstone0000965变质岩石学的发展允许确定许多变质岩的压力、温度、时间路径，然而伴随的变形通常以各种鲜为人知的方式影响这些估计，有时导致不正确或误导性的结果。该项目的目标是详细研究变质作用和变形作用之间的相互关系，即阿尔卑斯山中露出的角闪岩相剪切带，表现出各种剪切和压平组构。结果将被用来开发一套纹理指南，用于区分样品，这些样品允许有意义地计算变形岩石的压力和温度条件，以及那些产生虚假结果的样品。将使用变形过程、成分和组构来估计这些参数对所涉及岩性的多头流变性的影响。这项工作在变质作用和变形过程同步运行的许多地区具有相当重要的意义。

Selverstone0000965Developments in metamorphic petrology allow pressure, temperature time paths to be determined for many metamorphic rocks, however accompanying deformation commonly affects these estimates in a variety of poorly understood ways, sometimes leading to incorrect or misleading results. The goal of this project is to examine in detail the interrelationships between metamorphic and deformational processes is an amphibolite-facies shear zone exposed in the Alps that exhibits a variety of shear and flattening fabrics. Results will be used to develop a set of textural guidelines for distinguishing between samples that allow meaningful calculation of pressure temperature conditions from deformed rocks vs. those that yield spurious results. Deformation processes, compositions and fabrics will be used to estimate the effect these parameters have on bulls rheologies of the lithologies involved. This work has considerable importance in many areas where processes of metamorphism and deformation have operated synchronously.