Fluid Flow and Dehydration Reactions Inferred from Chloride Anomalies at Three Accretionary Complexes

大陆边缘增生杂岩是溶解物大规模流体输送的场所。在增生地体中发生的变形和压实过程是孔隙压力增加的原因，产生了这些大规模的流体流动。这些地区的温度和压力条件被认为是导致含水矿物脱水的原因，从而导致低氯化物流体的形成。氯化物浓度的变化是用于推断增生棱镜中优先路径和瞬态流动事件的观测的重要组成部分。这些鲜为人知的物质输送过程对地球储集层的地球化学和热平衡起着一级控制作用。该奖项将支持Dreiss博士研究低氯流体的起源，并在三个增生复合物（巴巴多斯、南开和秘鲁边缘）中开发流体和质量运输模型的组合。Dreiss博士建议开发模型，利用已知的场地几何形状、沉积物渗透性和孔隙水组成等信息来测试低氯流体的假设来源和运输机制。这些模型将提供流体流动的独立估计，可以与热传递研究得出的结果进行比较。

Continental margin accretionary complexes are sites of large- scale fluid transport of dissolved matter. Deformation and compaction processes occuring in accretionary terranes are resposible for increasing pore pressures producing these large scale fluid-flows. Temperature and pressure conditions in these areas are beleived to be responsible for the dehydration of hydrous minerals which then result in the formation of low chloride fluids. Variations in chloride concentrations are an essential part of the observations used to infer preferential pathways and transient flow episodes in accretionary prisms. These poorly understood material-transport processes exert a first-order control on the geochemical and thermal balance of the earth's reservoirs. This award will support Dr. Dreiss' efforts to investigate the origin of low chlorinity fluids and to develop a combination of fluid and mass transport models in three acccretionary complexes (Barbados, Nankai, and the Peru margin). Dr. Dreiss proposes to develop models which can can be used to test the hypothesized sources of low-chloride fluids and transport mechanisms with known information about site geometry, sediment permeabilities, and pore water compositions. These models will provide indepen- dent estimates of fluid flow which can be compared to those derived from heat transport studies.