Coeval boudinage and folding of oblique single layers under coaxial plane strain: Layer rotation around the principal stretching axis (X)

Coeval boudinage and folding of oblique single layers under coaxial plane strain: Layer rotation around the principal stretching axis (X)
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同轴平面应变下倾斜单层的同时布丁和折叠:绕主拉伸轴 (X) 的层旋转

DOI:
10.1016/j.jsg.2020.104217
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发表时间:
2020
影响因子:
3.1
通讯作者:
Hattingen
Hattingen
中科院分区:
地球科学2区
文献类型:
--
作者:
Zulauf;Zulauf;Hattingen

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我们进行了缩放模拟建模,以显示不同的层结晶度的单层褶皱和石香肠的几何形状的影响,同时开发下同轴平面应变。通过围绕主拉伸轴(X)转动层,逐渐改变主管层与缩短轴(Z)之间的初始角度(θZ(i))。虽然夹层旋转类似于相应的被动平面的旋转速度,但每个层都穿过不同的应变场(缩短、缩短减少、伸长),导致同时期的石香肠和F1褶皱,后者的褶皱轴平行于X。θZ(i)的升高导致石香肠的增加和F1褶皱的减少。F1-folds的振幅随层-基粘度比的增大而增大,但不受θZ(i)的影响。当θZ(i)> 45°时,F1折叠的弧长和波长增加。在低粘度的情况下,层和基质之间的比例,石香肠的影响F2倍的轴与层的垂直。F1褶皱和F2褶皱的翼间角都随着θZ(i)的增大而增大。它们经常出现在俯冲带背景的高压/低温变质岩和盐壁中。
We carried out scaled analogue modelling to show the influence of varying layer obliquity on the geometry of single-layer folds and boudins, which developed simultaneously under coaxial plane strain. The initial angle (θZ(i)) between the competent layer and the shortening axis (Z) was gradually changed by turning the layer around the principal stretching axis (X). Although oblique-layer rotation was similar fast like that of a corresponding passive plane, each layer was crossing different strain fields (shortening, reduced shortening, elongation) resulting in coeval boudinage and F1-folding, the latter with fold axes parallel toX. A rise inθZ(i)led to increase of boudinage and decrease of F1-folding. The amplitude of F1-folds increased with viscosity ratio between layer and matrix but was hardly affected byθZ(i). The arc- and wavelength of F1-folds, on the other hand, increased ifθZ(i)> 45°. In cases of low viscosity ratio between layer and matrix, boudins were affected by F2-folds with axes subperpendicular to the layer. Both F1- and F2-folds show increasing interlimb angles at risingθZ(i).The structures of the present study are largely not cylindrical and require investigation in three dimensions. They are frequent in high-pressure/low-temperature metamorphic rocks of subduction-zone settings and in salt walls.
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