The geology and structure of the Mid-Atlantic Ridge near Ascension Island

博士项目，这是一个延续的建议开始于2006年2月1日。总体目标是将深拖TOBI侧扫数据与大西洋中脊南纬7-11°之间地区的测深、微震和浊度数据结合起来，绘制该地区扩张轴的地质构造图。该地图及其所依据的三维数据集随后将用于：（a）阐明扩张轴的结构，包括确定构造和岩浆过程在扩张运动中的相互作用状态（B）提供预测工具，以指导该地区的进一步取样、热液勘探和结构调查。地质构造研究的结果将被输入到由SPP内其他研究人员开发的熔融、熔体提取和地幔运动的有限元模型中，以便直接测试模型预测。我们设想这一项目的成果是提供关于该地区地质和地球动力学的资料，这些资料具有足够的分辨率，可以对具有超区域甚至全球意义的地球动力学和热液过程作出定量说明。

The doctoral project for which this is the continuation proposal began on 1 Feb. 2006. The over-arching aims are to integrate the deep-towed TOBI side-scan data with bathymetric, microseismological and nephelometric data from the area between 7-11°S on the Mid-Atlantic Ridge to produce a geological-tectonic map of the spreading axis in this region. The map and the 3-dimensional datasets upon which it is based will then be used to (a) elucidate the structure of the spreading axis, including determining the state of interplay between tectonic and magmatic processes in taking up the spreading movement (b) provide a predictive tool to guide further sampling, hydrothermal prospecting and structural investigations in the area. Output from the geological-tectonic studies will be fed into finite element models of melting, melt extraction and mantle movement being developed by other investigators within the SPP to allow the model predictions to be tested directly. We envisage as the outcome of this project information on the geology and geodynamics of the area which is of sufficient resolution to allow quantitative statements to be made about geodynamic and hydrothermal processes which will have super-regional or even global relevance.