Ubehebe Peak Contact Aureole as a Test of Stochastic Modeling of Fluid-Rock Interaction

本研究的目的是通过对Ubehebe峰接触光圈的野外和地球化学研究，研究空间非均质和时间演化的渗透率的影响，并开发一个能够模拟典型上地壳接触光圈中发生的基本物理、热力学和输运过程的有限元程序。这包括质量和热传递、反应性示踪剂传递、变质反应、反应增强渗透性和渗透性崩溃。该提案的目标是：(a)完成一套基于地质统计学的光晕中碳酸盐和硅酸盐稳定同位素组成数据集；(b)建立地质统计学上有效的主要元素和微量元素数据库；(c)扩展有限元代码的能力，模拟浸润驱动的混合挥发性反应，以及反应过程中孔隙度和渗透率的变化；(d)在规范中加入简单的流变模型，以模拟岩石在发生反应时的塑性、脆性或弹性破坏所导致的孔隙崩塌。在这些模型中，孔隙度和渗透率的演化可以使用完全耦合输运代码以及连接渗透率和孔隙度、反应过程和孔隙度以及弹性和塑性孔隙崩塌的现象学方程来预测。

9614649 Baumgartner The aim of this research is to study the effect of spatially heterogeneous and temporally evolving permeability through field and geochemical studies in the Ubehebe Peak contact aureole and to develop a finite element code capable of modeling the basic physical, thermodynamic and transport processes occurring in a typical upper crustal contact aureole. This includes mass and heat transport, reactive tracer transport, metamorphic reactions, reaction enhancement of permeability, and collapse of permeability. The objectives of the proposal are to: (a) complete a geostatistically based data set of stable isotope compositions of carbonates and silicates in the aureole; (b) establish a geostatistically valid major and trace element data base; (c) expand the capabilities of the finite element code to model infiltration driven mixed volatile reactions, porosity and permeability changes due to reaction progress of such reactions; (d) to include in the code simple rheological models to simulate pore collapse due to plastic, brittle, or elastic failure of a rock undergoing reactions. The evolution of porosity, and hence permeability, in such models can be predicted using the fully coupled transport code together with phenomenological equations linking permeability and porosity, reaction progress and porosity, as well as elastic and plastic pore collapse.