Shear Zone Geometry, Strain and Fabrics in High-Grade Rocks,Northern Sweden

岩石中的韧性剪切带通常以三维排列发展，涉及非平面应变和可能的体积损失。该项目的目的是建立韧性剪切带中形成三维网状网络的应变和组构发展模式，了解变形的运动学，并检验剪切带发展的模型。所研究的剪切带发育于瑞典加里多尼德北部Sevve-Koli推覆构造的高级变质辉长岩中。根据剪切带发育的平面带模型进行的初步应变分析表明，体积损失随着应变的增加而增加，但现有的地球化学数据表明，变形是在等化学条件下发生的。三维应变分析将被应用于解决体积损失悖论，成功的结果将具有广泛的适用性。

Ductile shear zones in rocks commonly develop in three-dimensional arrays involving non-plane strains and possibly volume loss. The purpose of this project is to establish the pattern of strain and fabric development in ductile shear zones that form an anastomosing network in three dimensions, to understand the kinematics of deformation, and to test models of shear zone development. The shear zone to be studied developed in high-grade metagabbros of the Seve-koli nappes of the northern Swedish Caledonides. Preliminary strain analysis according to the planar band model of shear zone development indicates volume loss with increasing strain, yet available geochemical data indicate that deformation occurred under isochemical conditions. The three-dimensional strain analysis will be applied to the resolution of the volume loss paradox, and a successful result will be broadly applicable.