Structural Geomorphology of the Pacific-Antarctic EPR

太平洋-南极洲 EPR 的构造地貌

• 批准号: 8918898
• 负责人: Peter Lonsdale
• 金额: $ 14.9万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-01 至 1993-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8918898&HistoricalAwards=false
• 关键词: Structural; Geomorphology; Pacific; Antarctic; EPR

A field program will use Seabeam and SEAMARC II simultaneously for investigating the section of the East Pacific Rise along the Pacific-Antartic plate bondary. A principal objective is to determine how the characteristic structures of normal and oblique fracture zones are created at offsets of the rise-crest. The northern part of the Pacific.Antarcitc plate boundary is well suited for such a study, because it is the best modern, active analog to the Tertiary Pacifc-Kula and Pacific-Farallon spreading centers, where the well known North Pacific fracture zones were created. Sparse magnetic data from the rise flanks and the obliqity of the overall trend of the ridge crest to the spreading-normal direction suggest that it has small, migrating nontransform offsets, as well as a set of typical transform faults. Another aim of the porposed cruise is to establish the style of plan and profile segmentation of this poorly known accreting boundary.

现场项目将使用Seabeam和SEAMARC 二同时为调查的一部分，东 太平洋隆起沿着太平洋-南极板块的边缘。一 主要目的是确定特征如何 正向和斜向断裂带的构造产生于 脊顶的偏移。该地区的北方部分 南极洲板块边界非常适合这样的研究， 因为它是第三纪最好的现代活跃的类比 太平洋-库拉和太平洋-法拉隆扩散中心， 形成了著名的北太平洋断裂带。稀疏 从上升侧翼和倾斜的磁性数据 脊顶向展向法线的总体趋势 方向表明，它有小，迁移非转化 偏移，以及一组典型的变换故障。另一 目的是建立规划风格， 剖面分割这一鲜为人知的增生边界。