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

SGER：带扣与弯曲折叠：对其渐进发展的检验，反阿特拉斯山脉，摩洛哥

• 批准号: 0318906
• 负责人: Zeshan Ismat
• 金额: $ 2万
• 依托单位: Franklin and Marshall College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-15 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0318906&HistoricalAwards=false
• 关键词: SGER; Buckle; vs; Bend; Folding

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.

在褶皱-冲断带（FTB）中，在地壳浅部条件（即弹性-摩擦机制）下形成的褶皱主要通过屈曲或弯曲机制启动。 理论和模拟建模以及一些有限的基于现场的数据集在地壳浅部条件下的褶皱机制留给我们两个关键的未回答的问题：什么是限制（例如interlimb角，床厚度，应变率）屈曲和弯曲？ 除了最初的折叠，“扣”和“弯曲”折叠是否继续以其独特的方式收紧，或者在某个阶段，它们的折叠机制是否无法区分？ 当然，褶皱比大多数模型预测的要复杂得多;研究自然褶皱的例子可以提供一个更完整的褶皱历史图。 私家侦探提出了更好地理解折叠过程中使用的自然褶皱的例子在反阿特拉斯FTB（摩洛哥），这主要是由屈曲和弯曲的褶皱内形成的弹性摩擦（EF）制度。 独特的应变模式与每一个褶皱类型的裂缝网络和大规模的碎裂流EF制度内容纳。 这些裂缝将被检查，以解开应变历史，因此，折叠机制。