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

定量古水流/古坡度分析是沉积盆地研究中最有力的工具之一，但在山区内有问题的沉积盆地中尚未得到广泛应用。在对缅因州阿巴拉契亚山脉古水流和古斜坡方向进行区域调查的背景下，这项裁决将面临一些阻碍这项工作的分析困难。我们在两个问题领域引入了创新的方法：定向指示器的逆变形，以及软泥沙变形结构的运动学分析。根据变形过程中的层状极点路径，说明了一种合理的方向指示器逆变形方法，从而揭示了可能的倾斜校正路径的广泛选择。提出了一种用于定向指示器应变校正的简单的正交法结构，以取代拉姆齐在20世纪60年代初由S提出的可比较但更复杂的极射构造法。在软沉积物变形结构的运动学分析中提出的创新包括塌陷褶皱收敛法作为分离弧法和平均轴法的更强大的替代方法，以及使用位移立体向量来更好地利用来自软沉积物断层的可用信息。因此，拟议的研究将向沉积学社区介绍结构分析的几个最新进展。我们工作的一个重要副产品将是开发一个用户互动的Macintosh软件包，用于古水流和古斜坡分析，这将确保非专业人员能够接触到更困难和/或更费力的新程序。

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.