Application of a New Mathematical Model for Fluid-Rock Interaction to Contact and Regional Metamorphism

流体-岩石相互作用新数学模型在接触和区域变质作用中的应用

• 批准号: 8903493
• 负责人: John Ferry
• 金额: $ 13.75万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-07-15 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8903493&HistoricalAwards=false
• 关键词: Application; New; Mathematical; Model; Fluid

A new mathematical model for fluid-rock interaction has been developed that overcomes the problematic assumptions in calculations of fluid-rock ratios. The new model permits determination of time-integrated fluxes (units of volume fluid per area rock) and direction of flow from petrologic, geochemical, and/or isotopic data on rock samples. If duration of flow and fluid pressure gradients can be estimated, Darcy velocities, and in situ permeabilities may be computed. Proposed research will further develop the model and apply it to several significant problems in contact and regional metamorphism. Results will provide the first systematic determination of fluxes, flow directions, and rock permeabilities in a wide range of metamorphic environments. Specific projects include: (1) the amount, geometry, and geologic controls of fluid flow on the scale of an entire regional metamorphic terrane (Waits River Formation, eastern Vermont); (b) the amounts and direction of fluid flow in a ductile shear zone and their relation to metasomatism (shear zones at Scourie, northwest Scotland); (c) the amount, geologic controls, and chemical effects of fluid flow at the top of a major granitic batholith (roof pendants in the Sierra Nevada); (d) the role of fluid flow in anatexis (Onawa contact aureole, central Maine); (e) the amount and petrologic effect of fluid flow during very low-grade regional metamorphism (Liassic black shales, central Swiss Alps); and (f) the role of fluid flow in regional metasomatism (Vassalboro Formation, south-central Maine).

提出了一种新的流体-岩石相互作用数学模型， 开发克服了有问题的假设， 流体-岩石比率的计算。 新模式允许 时间积分通量的测定（体积流体单位 每面积岩石）和来自岩石学的流动方向， 岩石样品的地球化学和/或同位素数据。 如果持续时间 的流量和流体压力梯度可以估计，达西 可以计算速度和原位渗透率。 建议的研究将进一步发展该模型并应用于 它涉及到联系和区域方面的几个重大问题， 变质作用 结果将提供第一个系统的 通量、流向和岩石渗透率的测定 在大范围的变质环境中。 具体项目 包括：（1）数量，几何形状和地质控制 整个区域变质带规模的流体流动 （Waits River Formation，东佛蒙特州）;（B）数量和 韧性剪切带中流体流动方向及其 与交代作用的关系（西北部斯库里的剪切带 （c）数量、地质控制和化学 一个主要花岗岩基顶部流体流动的影响 (roof在内华达州山脉的悬垂物）;（d）流体流动的作用 在深熔作用（Onawa接触光环，中央缅因州）;（e） 极低品位阶段流体流动的数量和岩石学效应 区域变质作用（Liassic黑色页岩，瑞士阿尔卑斯山中部）; 流体流动在区域交代作用中的作用 （缅因州中南部瓦萨尔伯勒组）。