Structural Geomorphology of the Pacific Antarctic EPR

一个现场计划将同时使用SeaBEAM和SEAMARC II来调查沿太平洋-南极板块边界的东太平洋隆起部分。一个主要目标是确定正常和斜向断裂带的特征结构是如何在隆起-山顶的偏移量处形成的。太平洋-南极板块边界的北部非常适合进行这样的研究，因为它是第三纪太平洋-库拉和太平洋-法拉隆扩张中心的最现代、最活跃的模拟，众所周知的北太平洋断裂带就是在那里形成的。隆起两侧稀疏的磁性资料和海脊总体走向向展布法线方向的倾角表明，它具有较小的迁移非变换炮检距，以及一组典型的变换断层。拟议中的巡航的另一个目的是建立这一鲜为人知的沉积边界的平面和剖面分段的风格。

A field program will use Seabeam and SEAMARC II simultaneously for investigating the section of the East Pacific Rise along the Pacific-Antarctic plate boundary. A principal objective is to determine how the characteristic structure of normal and oblique fracture zones are created at offsets of the rise-crest. The northern part of the Pacific-Antarctic plate boundary is well suited for such a study, because it is the best modern, active analog to the Tertiary Pacific-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 obliquity 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 proposed cruise is to establish the style of plan and profile segmentation of this poorly known accreting boundary.