A 2-D SeaMARC II/Gravity Study of Near-Axis "Gravity Rolls" on the Southern East Pacific Rise

本项目旨在确定南东太平洋隆起的横粒重力卷的起源时间、与地幔上涌的联系以及发展模式。主要研究人员将对东太平洋隆起西侧南纬16至19度之间的0至600万年前的地壳进行SeaMARC II和重力调查。SeaMARC的广泛覆盖范围还将用于解决与大型偏移重叠扩散中心演变有关的问题。SeaMARC II是一种海底测绘工具，广泛用于提供广泛的水深和侧面扫描图像。这些数据将提供有关海底形态和构造历史的重要信息，也将有助于更好地确定对重力数据的地形修正。横粒重力卷是一种在卫星数据中发现的异常特征。这些有趣而反常的特征还没有从水面舰艇上被彻底研究过。多年来，主要研究人员在海洋构造和重力数据解释领域发挥了领导作用。他们非常适合这项研究。

This is a project to determine the time of origin, linkage to mantle upwelling, and mode of development of cross-grain gravity rolls on the southern East Pacific Rise. The principal Investigators will carry out SeaMARC II and gravity surveys of 0 to 6 million year old crust on west flank of the East Pacific Rise between 16 and 19 South. The extensive SeaMARC coverage will also be used to address problems relating to the evolution of large offset overlapping spreading centers. %%% SeaMARC II is a sea floor mapping tool that is used extensively to provide extensive bathymetric and side scan imagery. The data will provide important information on the morphology and tectonic history of the sea floor and will also assist in making better determinations of topographic corrections to the gravity data. The cross grain gravity rolls are anomalous features originally detected in satellite data. These interesting and anomalous features have not been thoroughly studied from a surface ship. The Principal Investigators have provided leadership in the area of marine tectonics and gravity data interpretation for many years. They are uniquely well qualified for this study.