The influence of matrix rheology and vorticity on fabric development of populations of rigid objects during plane strain deformation

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• 作者：Piazolo ; Sandra ; Bons ; P.D. ; Passchier ; C.W.
• 关键词：Analogue modelling ; Shape-preferred orientation ; General flow ; Strain localization ; Power law flow
• 刊名：Tectonophysics
• 出版年：2002
• 出版时间：July 15, 2002
• 年：2002
• 卷：351
• 期：4
• 页码：315-329
• 全文大小：888 K

文摘

The influence of vorticity and rheology of matrix material on the development of shape-preferred orientation (SPO) of populations of rigid objects was experimentally studied. Experiments in plane strain monoclinic flow were performed to model the fabric development of two populations of rectangular rigid objects with object aspect ratios (R_ob) 2 and 3. The density of the rigid object populations was 14 % of the total area. Objects were dispersed in a Newtonian and a non-Newtonian, power law matrix material with a power law exponent n of 1.2. The kinematic vorticity number (W_n) of the plane strain monoclinic flow was 1, 0.8 and 0.6 with finite simple shear strain of 4.6, 3.0 and 0.9, respectively. In experiments with R_ob