Investigation ofFluid Flow in an Ancient Subduction Zone

增生楔基底的变形性质可能涉及二氧化硅和其他成分的流体的广泛运输、脆性裂缝封闭脉纹和岩石组构（如解理）。然而，对流体相互作用的大小及其作用范围的估计是极具争议的。该项目将研究阿拉斯加Afognak岛一个暴露良好且了解充分的弧前杂岩中石英脉的分布、方位、几何形状、结构和地球化学。结合围岩体积变化测量和氧同位素分析，将重建埋深8-12km的岩石管道系统，并用于推断硅输运机制以及吸积楔基底附近流体流动的程度和性质。研究结果将对吸积、楔形发育的研究以及岩石变形组构的起源研究具有重要意义。

The nature of deformation hear the base of accretionary wedges likely involves extensive transport by fluids of silica and other components, brittle crack-seal veining and rock fabrics such as cleavage. However, estimates of the magnitude of fluid interactions and the scale over which they are operative is highly controversial. This project will examine the distribution, orientation, geometry, texture and geochemistry of quartz veins in a well-exposed and well-understood forearc complex on Afognak Island, Alaska. Coupled with measurements of volume change in wall rocks and oxygen isotopic analyses the plumbing system in rocks buried to depths of 8-12km will be reconstructed and used to infer the mechanisms of silica transport and the extent and nature of fluid flow near the base on an accretionary wedge. Results will be relevant to the study of accretionary, wedge development and to the study of the origins of rock deformation fabrics.