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

瑞典北部高品位岩石的剪切带几何形状、应变和结构

• 批准号: 9506504
• 负责人: Peter Hudleston
• 金额: $ 11.01万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-15 至 1999-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9506504&HistoricalAwards=false
• 关键词: Shear; Zone; Geometry; Strain; Fabrics

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.

岩石中的延性剪切带通常以三维阵列形式形成，涉及非平面应变和可能的体积损失。 该项目的目的是建立在三个维度上形成吻合网络的延性剪切带中的应变和织物发展模式，了解变形的运动学，并测试剪切带发展的模型。 待研究的剪切带发育于瑞典喀里多尼德北部塞韦科利推覆体的高品位变辉长岩中。 根据剪切带发育的平面带模型进行的初步应变分析表明，体积随着应变的增加而损失，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。