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

从三个增生杂岩处的氯化物异常推断出流体流动和脱水反应

基本信息

批准号：
9116462
负责人：
J. Casey Moore
金额：
$ 16.59万
依托单位：
University of California-Santa Cruz
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1991
资助国家：
美国
起止时间：
1991-11-01 至 1996-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9116462&HistoricalAwards=false
关键词：
Fluid Flow Dehydration Reactions Inferred

项目摘要

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.

大陆边缘增生杂岩是大型- 溶解物质的尺度流体输送。变形和发生在加积岩中的压实过程是增加孔隙压力，产生这些大的规模流体流动。温度和压力条件在这些这些区域被认为是导致含水矿物质，然后导致形成低氯化物液体氯化物浓度的变化是用于推断优惠的观察结果的重要部分通道和瞬态流动插曲增生棱镜。这些知之甚少的物质运输过程，地球化学和热平衡的一级控制地球的水库该奖项将支持德赖斯博士的努力，以调查低氯度液体的起源，并开发一种三种增生复合体中的流体和质量输运模型（巴巴多斯、南海和秘鲁边缘）。德赖斯博士提议开发可用于测试假设的模型低氯液体的来源和运输机制，关于场地几何形状、沉积物渗透性和孔隙水组成。这些模型将提供独立的- 流体流量的凹痕估计值，可与来自热传输研究。