Strain partitioning in transpression zones

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• 作者：Jones ; Richard R. ; Tanner ; P. W. Geoff
• 刊名：Journal of Structural Geology
• 出版年：1995
• 出版时间：June, 1995
• 年：1995
• 卷：17
• 期：6
• 页码：793-802
• 全文大小：1.19 M

文摘

Transpressional strain acting upon structurally anisotropic rocks can be partitioned into separate deformational domains of pure shear and simple shear. This contrasts with homogeneous transpression in which both the pure shear and the simple shear strain components are uniformly distributed across the zone of deformation. Structural weaknesses capable of partially or fully accommodating one component of deformation include lithological contacts, rheological heterogeneities, and faults or shear zones situated within the deformation zone or lying along its boundaries. Partitioning of transpressional strain can occur when stress is applied oblique to pre-existing structural weaknesses, or can occur during later stages of progressive strain, when the early deformation of isotropic rocks imparts sufficient anisotropy to allow subsequent strain to be partitioned. Partitioning of transpressional strain into domains lying parallel to the deformation zone boundaries can be distinguished from ‘fault-stepped’ transpression, in which strain is partitioned along the length of a segmented fault zone.