Boudinage and two-stage folding of oblique single layers under coaxial plane strain: Layer rotation around the axis of no change (Y)
Boudinage and two-stage folding of oblique single layers under coaxial plane strain: Layer rotation around the axis of no change (Y)
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同轴平面应变下倾斜单层的布丁纳奇和两级折叠:绕无变化轴(Y)的层旋转
DOI:
10.1016/j.jsg.2020.104023
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发表时间:
2020
影响因子:
3.1
通讯作者:
Hattingen
中科院分区:
文献类型:
--
作者:
Zulauf;Zulauf;Hattingen
Scaled analogue modelling using non-linear viscous plasticine as rock analogue has been carried out to investigate the influence of varying layer obliquity on the geometry of single-layer folds and boudins under bulk coaxial plane strain. Two deformation series with different viscosity ratio between layer and matrix (m= 18 and 82) were carried out. The initial angle between shortening axis and competent layer (θZ(i)) was gradually changed from 0° to 90° by multiples of 11.25°. Shortening atθZ(i)< 30° was accommodated by layer thickening and two-stage folding. Low-wavelength F1-folds were refolded by large-wavelength homoaxial F2-folds, both with similar degree of tightness. With increasing layer obliquity, the number of folds and the degree of F2-fold asymmetry decrease, and F1- and F2-folds approximate in size. Although bulk shortening was high (eZ= −70%), the rotated long limbs of asymmetric folds are free from boudinage. Boudins, however, developed by combined necking and tensile fracturing atθZ(i)> 60°. Because of the high finite strain and related layer rotation, these boudins are not asymmetric (as expected) but symmetric. Folds and boudins like those produced in the present study occur in salt rocks and in crystalline basement deformed at deeper structural levels.
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DOI:
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发表时间:
1996
期刊:
影响因子:
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作者:
T. Kidan;J. Cosgrove
通讯作者:
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DOI:
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发表时间:
2009
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2002
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通讯作者:
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1976
期刊:
影响因子:
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作者:
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通讯作者:
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影响因子:
3.1
作者:
J. Zulauf;G. Zulauf;J. Göttlich;M. Peinl
通讯作者:
M. Peinl