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Heterogeneous strain behaviour in competent layers during folding in transpressive regimes

机译：超压条件下折叠过程中感受层中的异质应变行为

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The understanding of folding processes in transpression is crucial in structural geology. However, the study of folding in multilayers where adjacent strata exhibit high competence contrast is impossible if the observations are only restricted to geometrical features. Nevertheless, using detailed three dimensional finite strain analyses it is possible to constrain the solutions. Strain data from the deformed northern Portugal Ordovician quartzites show that folding mechanisms in transpression are highly variable. For the more deformed materials found, not only in the short limbs, but also in the thinner layers of the long limbs, the strain ellipsoids orientations can be explained by a combination of flexural shear (related to the folding process) and sinistral wrench component parallel to the bedding plane (a pervasive regime in the southern branch of the lbero-Armorican Arc). In the thicker layers of the long limbs, orthogonal flexure seems to be the dominant mechanism. Concerning the strain ellipsoid shape, the constrictional forms predominate mainly in the long limbs. Strain partitioning in transpressive regimes is important at the mesoscopic fold scale, especially in asymmetric folds. In the more deformed short limb, the data indicate that transpression tends to be always an active mechanism, while in the long limb the regional wrench component it's often less important. (C) 2008 Lavoisier SAS. All rights reserved
机译：在压裂过程中，对折叠过程的理解对于构造地质至关重要。但是，如果观察仅限于几何特征，则不可能研究相邻地层表现出高能力对比的多层折叠。但是，使用详细的三维有限应变分析可以约束解。来自变形的北部葡萄牙奥陶纪石英岩的应变数据表明，压转的折叠机制高度可变。对于发现的变形较大的材料，不仅在短肢中，而且在长肢的较薄层中，应变椭圆体的取向都可以通过弯曲剪切（与折叠过程有关）和平行的左弦扳手组件的组合来解释。到层理平面（lbero-Armorican弧的南部分支的普遍区域）。在长肢的较厚层中，正交弯曲似乎是主要的机制。关于应变椭球形状，收缩形式主要在长肢中占主导。反压模式下的菌株分配在介观倍数范围内很重要，尤其是在不对称倍数中。数据表明，在变形更严重的短肢中，压迫往往是一个活跃的机制，而在长肢中，区域性扳手组件则往往不那么重要。 （C）2008 Lavoisier SAS。版权所有

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