ROW: Paleocurrent and Paleoslope Analysis in Deformed Rocks:New Procedures Applied to Problematic Siluro-Devonian Stratain the Acadian Orogen, Maine

ROW：变形岩石中的古水流和古坡分析：应用于缅因州阿卡迪亚造山带有问题的志罗-泥盆纪地层的新程序

• 批准号: 8803233
• 负责人: Lindley Hanson
• 金额: $ 4.92万
• 依托单位: Salem State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-15 至 1991-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8803233&HistoricalAwards=false
• 关键词: ROW; Paleocurrent; Paleoslope; Analysis; Deformed

Quantitative paleocurrent/paleoslope analysis, one of the most powerful tools in the study of sedimentary basins, has not been widely applied in problematic metasedimentary basins within mountain belts. This award will confront some of the analytical difficulties which have discouraged such work, in the context of a regional survey of paleocurrent and paleoslope directions in the Maine Appalachians. We introduce innovative approaches in two problem areas: retrodeformation of directional indicators, and kinematic analysis of soft-sediment deformation structures. A rational approach to retrodeformation of directional indicators is illustrated in terms of bedding pole paths during deformation, and a broad selection of possible tilt-correction paths is thereby revealed. A simple orthographic construction for strain correction of directional indicators is proposed to supercede comparable but more complex stereographic constructions proposed in the early 1960's by Ramsay. Proposed innovations in kinematic analysis of soft-sediment deformation structures include slump fold vergence as a more powerful alternative to the separation arc and mean axis methods, and the use of displacement stereovectors to better exploit available information from soft-sediment faults. The proposed research will thereby introduce several recent advances of structural analysis to the sedimentological community. An important by-product of our work will be the development of a user-interactive Macintosh software package for paleocurrent and paleoslope analysis, which will ensure that the more difficult and/or laborious new procedures will be accessible to non-specialists.

定量古水流/古坡度分析， 沉积盆地研究中的有力工具，尚未广泛应用 应用于山区内有问题的变质沉积盆地。 这个奖项将面临一些分析上的困难， 在区域调查的范围内， 缅因州阿巴拉契亚山脉的古水流和古坡度方向。 我们 在两个问题领域引入创新方法： 软泥沙运动学分析 变形构造 逆变形的一种合理方法 方向指示器是用层积极路径来表示的 在变形过程中，以及广泛的倾斜校正选择 路是这样被发现的。 一个简单的正交结构， 建议用方向指示器的应变校正代替 提出了类似的，但更复杂的赤平投影结构， 1960年代初，Ramsay 运动学分析中的拟议创新 包括滑塌褶皱聚散， 一个更强大的替代分离弧和平均轴 方法，并使用位移立体矢量，以更好地利用 软沉积物断层的可用信息。 拟议 因此，研究将介绍结构的几个最新进展 沉积群落分析。 一个重要的副产品， 我们的工作将是开发一个用户交互式的Macintosh 古水流和古坡度分析软件包， 确保更困难和/或费力的新程序将 非专业人士也可以使用。