Episodic Accretion on the Mid-Atlantic Ridge: Interpretation and Sampling of Crustal Sections from the Kane Transform Fault

了解洋壳的组成和化学 一直是海洋地球科学的长期目标。等 信息提供了重要的制约过程， 将地幔物质转移到地壳， 随后改变了 控制着海水的成分这样的 然而，要想了解这一点，就需要有一种方法来取样地壳岩石 以及将各个地壳层与 下伏地层虽然深地壳钻探是这样一个 技术，深地壳孔是昂贵的，并提供有限的 地壳物质的区域取样。最近出现了 重新对研究断层地壳暴露的兴趣， 对地壳岩石的地层序列进行取样， 潜水/疏浚或通过一系列浅钻孔。 本合同将进行侧扫声纳调查， 北部凯恩转换断层暴露的地壳岩石 大西洋该项目的目标是绘制 地壳层，以采样火成岩的地层序列 岩石暴露沿着转换，并检查断层 沿沿着主要陡坎暴露的图案。这些数据将用于 确定地壳增生的历史和随后的 变形此外，这些数据将提供所需的 为该地区随后的潜水研究进行调查。的 该项目是一项科学家之间的合作研究 华盛顿大学、杜克大学和 巴黎。

Understanding the composition and chemistry of the oceanic crust has been a long term goal of the marine geosciences. Such information provides important constraints on the processes that transfer mantle material to the crust, that lead to the formation of the igneous crust, and that subsequently modify the chemistry of the crust and control the composition of seawater. Such an understanding, however, requires a means to sample crustal rock and a way to relate individual crustal layers to over- and underlying strata. Although deep crustal drilling is one such technique, deep crustal holes are expensive and provide limited areal sampling of crustal material. Recently there has been renewed interest in studying faulted crustal exposures as a way to sample a stratigraphic succession of crustal rocks by submersible/dredging or by a series of shallow drill holes. The present award will undertake a side-scan sonar survey of exposed crustal rocks in the Kane Transform Fault in the north Atlantic. Objectives of the project are to map the continuity of crustal layers, to sample the stratigraphic succession of igneous rocks exposed along the transform, and to examine the faulting pattern exposed along major scarps. These data will be used to determine both the history of crustal accretion and subsequent deformation. Additionally, these data will provide the needed survey for subsequent submersible research in the area. The project is a cooperative study between scientists at the University of Washington, Duke University and the University of Paris.