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首页> 外文期刊>Geodinamica Acta >Folding of the Gediz Graben Fill, SW Turkey: Extensional and/or contractional origin?
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Folding of the Gediz Graben Fill, SW Turkey: Extensional and/or contractional origin?

机译：土耳其西南部Gediz Graben Fill的折叠：扩展和/或收缩起源？

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摘要

Folds constitute a significant pan within the dominantly extension-related deformation pattern of the Gediz Graben and their origin either extensional or contractional has been the subject of debate. Field and subsurface data presented in this paper suggest that folds of contractional and extensional origin coexist in the graben-fill sediments. Contractional folds are predominantly observed within the Alasehir formation. A north vergent, plunging, asymmetrical to overturned geometry characterizes these folds and they are commonly observed in association with south dipping both thrust and reverse faults; the presence of thrust/reverse faults in the Gediz Graben is documented for the first time here. Fault data suggest an approximately N-S direction of compression that has governed the contractional deformation. Yet the limited distribution of these structures prevents to relate them with confidence to a regional deformation phase. Extensional folds occur in association with normal faults either as structures longitudinal or transverse with respect to the general graben trend. Transverse folds are a very common within the buried graben block, owing to the lateral displacement gradients (lateral difference in offset) on the individual fault segments along the southern margin of the graben. Synclines and anticlines have formed at displacement maxima and minima, respectively. Thickness of strata increases at synclines and decreases at anticlines, thus indicating the syn-depositional origin of the folding.
机译：褶皱在Gediz Graben的主要与伸展相关的变形模式中构成重要的平底锅，其伸展或收缩的起源一直是争论的主题。本文提供的野外和地下数据表明，在grab石充填沉积物中褶皱和伸展成因的褶皱共存。收缩褶皱主要在Alasehir地层中观察到。这些褶皱的特征是北缘呈倾角，倾角，不对称，这是这些褶皱的特征，通常与南倾和逆冲断层一起观察到它们。此处首次记录了Gediz Graben中逆冲/逆断层的存在。断层数据表明控制了收缩变形的近似N-S压缩方向。然而，这些结构的有限分布阻止了它们有把握地与区域变形阶段联系起来。与正常断层相关的伸展褶皱是相对于总体grab陷趋势而言纵向或横向结构。横向褶皱在埋入式grab石块中非常普遍，这是由于沿lateral石南缘的各个断层段的侧向位移梯度（偏移的侧向差异）所致。向斜线和背斜线分别在位移最大值和最小值处形成。地层厚度在向斜方向增加，在背斜减少，因此表明褶皱的同沉积起点。

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