SGER: Buckle vs Bend Folding: An Examination of Their Progressive Development, Anti-Atlas Mountains, Morocco

在褶皱冲断带(FTB)中，在地壳浅层条件下形成的褶皱(即弹性摩擦机制)主要由屈曲或弯曲机制启动。理论和模拟模拟以及一些关于地壳浅层条件下褶皱机制的有限现场数据集给我们留下了两个关键的悬而未决的问题：什么是屈曲和弯曲的极限(例如：肢间角、床层厚度、应变率)？除了最初的折叠，“弯曲”和“弯曲”折叠是继续以它们自己独特的方式收紧，还是在某个阶段，它们的折叠机制难以区分？当然，折叠比大多数模型预测的要复杂得多；研究自然折叠的例子为折叠历史提供了更完整的图景。P.I.建议使用反Atlas FTB(摩洛哥)中的自然褶皱实例更好地理解褶皱过程，该褶皱主要由在弹性摩擦(EF)区域内形成的褶皱和弯曲褶皱组成。与每种褶皱类型相关的独特应变模式被EF体制内的裂隙网络和大规模碎裂流所容纳。将对这些裂缝进行检查，以揭示应变历史，从而揭示折叠机制。

Within fold-thrust belts (FTBs), folds that form under shallow crustal conditions (i.e. elastico-frictional regime) initiate primarily by either buckling or bending mechanisms. Theoretical and analog modeling as well as some limited field-based data sets on folding mechanisms under shallow-crustal conditions leave us with two critical unanswered questions: What are the limits (e.g. interlimb angle, bed thickness, strain rate) to buckling and bending? Beyond initial folding, do 'buckle' and 'bend' folds continue to tighten in their own unique ways or, at a certain stage, are their folding mechanisms indistinguishable? Surely, folding is much more complex than most models predict; studying natural fold examples provides a more complete picture to folding histories. The P.I. proposes to better understand folding processes using natural fold examples in the Anti-Atlas FTB (Morocco), which is primarily composed of buckle and bending folds that formed within the elastico-frictional (EF) regime. Unique strain patterns associated with each fold type are accommodated by fracture networks and large-scale cataclastic flow within the EF regime. These fractures will be examined to unravel the strain histories, and therefore, folding mechanisms.