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在涉及非平面菌株和可能量损失的三维阵列中发展。 该项目的目的是建立在延性剪切区域中应变和织物发育的模式，该剪切区域在三个维度上形成吻合网络，以了解变形的运动学以及测试剪切区开发的模型。 将研究的剪切带在瑞典北部壁板的Seve-Koli nappes的高级Metagabbros中发展。 根据剪切区发育的平面带模型的初步应变分析表明，体积损失随着应变的增加而丢失，但可用的地球化学数据表明在等化条件下发生了变形。 三维应变分析将应用于量损失悖论的分辨率，成功的结果将广泛适用。