Ridge Segmentation, Plate Boundary Architecture and Behaviorof Non-Rigid Discontinuities Along the MAR in the South Atlantic

南大西洋 MAR 沿线的山脊分割、板块边界结构和非刚性不连续性行为

• 批准号: 8917762
• 负责人: Paul Fox
• 金额: $ 23.94万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917762&HistoricalAwards=false
• 关键词: Ridge; Segmentation; Plate; Boundary; Architecture

This is a project to map a section of the Mid-Atlantic Ridge in the South Atlantic and is designed to answer fundamental questions and to test hypothese central to understanding of a slow to intermediate spreading rate ridge system in the South Atlantic. The questions to be addreses include: 1) What is the segmentation geometry of the Mid-Atlantic Ridge in the South Atlantic and what is the relative abundance of first and second order discontinuities? 2) How does the segmentation geometry observed along a representative length of ridge compare with the early segmentation character of the South Atlantic in terms of the distribution of first and second order discontinuities? 3) What are the structual and kinematic characteristics associated with a change in plate boundary geometry and the creation of a second-order discontinuity? 4) What are the strutural and morphologic characteristics associated with the trnsfromation of a first-order discontinuity to a second-order discontinuity and what is the age of the offset when the boundary no longer behaves rigily? 5) What are the morphotectonic characteristics associated with evolution of a second-order discontinuity to a third-order discontinuity? 6) What is the distribution of rifted and non- rifted ridge segments along the MAR between 22S and 34S?

这是一个绘制南大西洋中大西洋海脊的一段地图的项目，旨在回答基本问题并测试这些假说，这些问题对于了解南大西洋中低扩散速率的海脊系统至关重要。要解决的问题包括：1)南大西洋中大西洋海脊的分段几何形状是什么，一级和二级不连续面的相对丰度是多少？2)沿着代表脊线长度观察到的分段几何形状与南大西洋早期的分段特征在一级和二级分布方面是如何比较的不连续性？3)与板块边界几何形状的变化和二阶不连续有关的结构和运动学特征是什么？4)与一阶不连续向二阶不连续转变相关的结构和形态特征是什么？当边界不再表现出行为时，偏移的年龄是多少？确切地说？5)与二级不连续面到三级不连续面的演化有关的地形构造特征是什么？6)在22-34S之间，MAR的裂谷和非裂谷海脊段的分布是什么？