Toward a Constrained Hydrodynamic Model of Contact Metamorphism

接触变质作用的约束流体动力学模型

• 批准号: 9805102
• 负责人: Peter Nabelek
• 金额: $ 17.28万
• 依托单位: University of Missouri-Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-06-15 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9805102&HistoricalAwards=false
• 关键词: Toward; Constrained; Hydrodynamic; Model; Contact

9805102 Nabelek The PI will conduct a numerical study of contact metamorphism in the calc-silicate Notch Peak aureole, Utah, to obtain better understanding of hydrodynamic parameters that control thermal evolution and fluid flow in contact aureoles. They will build on currently available petrologic and geochemical parameters on flow of reactive fluids as reflected by mineral assemblages and geochemistry of the aureole. The parameters include: (1) budget of magmatic, metamorphic and formation fluid sources, (2) layered, lithologically controlled permeability structure of the aureole, (3) transient porosities, including those resulting from fracturing and volume changes in metamorphic rocks, (4) transient thermal field, (5) latent heat of crystallization of magma, (6) consumption of heat by metamorphic reactions and heating of fluids, and (7) observed geometry of the intrusion and its aureole. Numerical simulations will be constrained by previous petrologic and geochemical results on fluid flow in the overall aureole and by detailed morphologic, mineralogic, and stable isotope analyses of outcrops. The outcrop-scale data will give indications of flow geometry, type of porosity and permeability, and fluid flux on scale of individual beds. Besides a better understanding of the Notch Peak aureole, the results will be a significant contribution to the knowledge of metamorphism, because the parameters to be investigated are fundamental to fluid flow associated with all contact aureoles.

9805102 Nabelek 项目负责人将对犹他州钙硅酸盐 Notch Peak 光环中的接触变质作用进行数值研究，以更好地了解控制接触光环中的热演化和流体流动的流体动力学参数。他们将建立在当前可用的反应流体流动的岩石学和地球化学参数的基础上，如矿物组合和光环地球化学所反映的那样。这些参数包括：（1）岩浆、变质岩和地层流体来源的预算，（2）层状、岩性控制的光环渗透结构，（3）瞬态孔隙度，包括变质岩破裂和体积变化产生的孔隙度，（4）瞬态热场，（5）岩浆结晶潜热，（6）变质反应的热量消耗 和加热流体，以及（7）观察侵入物及其光环的几何形状。数值模拟将受到先前关于整个光环中流体流动的岩石学和地球化学结果以及露头的详细形态学、矿物学和稳定同位素分析的限制。露头规模的数据将给出流动几何形状、孔隙度和渗透率类型以及单个床规模的流体通量的指示。除了更好地了解缺口峰光环之外，这些结果还将对变质作用的知识做出重大贡献，因为要研究的参数对于与所有接触光环相关的流体流动至关重要。