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首页> 外文期刊>Journal of structural geology >Importance of differentiating ductile slickenside striations from stretching lineations and variation of shear direction across a high-strain zone
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Importance of differentiating ductile slickenside striations from stretching lineations and variation of shear direction across a high-strain zone

机译：区分延展线和延展剪切方向变化的高延展性韧性延展性条纹的重要性

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Shear direction is an important parameter in the kinematic interpretation of high-strain zones. Recent developments in the study of high-strain zones show that there is no simple relationship between the orientation of stretching lineations and the shear direction and it is difficult to use the former to determine the latter. In contrast, striations on C-surfaces, a product of ductile deformation, form parallel to the shear direction. It is therefore important for the kinematic interpretation of high-strain zones to differentiate such striations from stretching lineations. Ductile striations are much more common in natural high-strain zones than reported in the literature. We discuss how to differentiate the two types of lineations and describe a natural high-strain zone example from the Superior craton of Canada. The striation data show that the shear direction of the high-strain zone varies from subhorizontal to moderately plunging across the strike of the zone. We conclude that well-developed ridgein-groove type striations are a reliable indicator of the shear direction. We also discuss situations where the orientation of stretching lineations can potentially be used as an indicator of shear direction.
机译：剪切方向是高应变区运动学解释中的重要参数。高应变区研究的最新进展表明，拉伸线的方向和剪切方向之间没有简单的关系，并且很难用前者来确定后者。相反，延性变形的产物C面上的条纹平行于剪切方向形成。因此，对于高应变区的运动学解释而言，区分这些条纹与伸展线很重要。天然高应变带中的韧性条纹比文献中报道的要普遍得多。我们讨论了如何区分两种类型的线型，并描述了来自加拿大上级克拉通的自然高应变带示例。横纹数据表明，高应变区的剪切方向在水平走向范围内从水平以下变化到适度下降。我们得出的结论是，发达的脊纹-槽型条纹是剪切方向的可靠指标。我们还讨论了拉伸线条的方向可能用作剪切方向指示的情况。

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