Paleotectonic Controls on the Boundary Between Thin and Thick-Skinned Deformation

古构造运动对薄皮变形与厚皮变形边界的控制

• 批准号: 9418087
• 负责人: Richard Allmendinger
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-01-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418087&HistoricalAwards=false
• 关键词: Paleotectonic; Controls; Boundary; Between; Thin

9418087 Allmendinger Two fundamentally different tectonic styles are exhibited by fold/thrust belts- those involving basement (thick-skinned) and those involving only cover (thin skinned). Previous work has shown that thick and thin-skinned deformation are both active simultaneously in the Andes at 30oS, and the boundary occurs across a geometric triangle zone between the central precordillera and the eastern precordillera, Sierra Pampeanas. This project will use a unique industry seismic reflection data set and fieldwork to investigate the hypothesis that the dramatic change of structural geometry is controlled by preexisting anisotropies in the crust of western Argentina. Results should help explain the controls on thick or thin deformation styles in fold-thrust belts.

9418087阿尔门丁格褶皱/冲断带显示了两种根本不同的构造样式--涉及基底的构造样式(厚皮)和只涉及盖层的构造样式(薄皮)。前人的工作表明，在南纬30 oS的安第斯山脉，厚皮和薄皮的变形都同时活跃，边界跨越中央前心形带和东部前心形带之间的几何三角形带，即帕姆花生山脉。该项目将使用独特的工业地震反射数据集和野外工作来调查构造几何结构的剧烈变化是由阿根廷西部地壳中先前存在的各向异性控制的假设。研究结果有助于解释褶皱冲断带中对粗细变形样式的控制。