Quantitative Evaluation of the Roles of Fluid Infiltration During Contact Metamorphism in the Alta Stock Thermal Aureole, Little Cottonwood Canyon, Utah

碳酸盐岩变质过程中流体渗入的程度及其在变质过程中对反应进程、孔隙流体成分和热收支的影响，是变质地质学家尚未解决的基本问题。尽管最近的几项研究已经证实了流体渗透的重要性，但这一过程的细节(例如，数量和渗透方式、时间、对孔隙流体成分的影响、与结构的关系等)都是不可忽视的。没有受到很好的约束，而且是有争议的。此外，还没有关于接触变质晕中流体渗透在对流换热中的具体作用的详细研究。对接触变质硅质白云岩进行了岩石学、相平衡、同位素和传热学的综合研究。对犹他州小红木峡谷阿尔塔斯托克热晕接触变质硅质白云岩的平衡、同位素和传热学进行了研究。这些白云岩在接触变质过程中被180贫水的富水流体渗入。研究的目的是利用岩石学和稳定同位素技术定量评价流体渗入白云岩大理岩的程度，确定渗入流体的来源，并确定渗入的几何形状和类型(例如，沿构造或层理优先渗透或沟道化)。这些结果将限制流体渗入到极光中的热传递和阿尔塔股票的总热损失的热后果的数值模拟。

The extent of fluid infiltration accompanying the metamorphism of carbonate rocks, and its roles in influencing reaction progress, pore fluid compositions, and thermal budgets during metamorphism, are fundamental but unresolved questions to metamorphic geologists. Although the importance of fluid infil- tration has been established with several recent studies, the details of the process (e.g., amounts and infiltration style, timing, influence on pore fluid composition, relationships to structures, etc.) are not well constrained and are controversial. In addition, there have been no detailed studies of the specific roles of fluid infiltration in convective heat transfer in contact metamorphic aureoles. A comprehensive petrologic, phase equilibria, isotope, and heat transfer study is proposed for the contact metamorphosed siliceous dolomites of the equilibria, isotope, and heat transfer study is proposed for the contact metamorphosed siliceous dolomites of the Alta Stock thermal aureole in Little Cottonwood Canyon, Utah. These dolomites have been infiltrated during contact metamorphism by 180-depleted and water-rich fluids. The objectives of the study are to use petrological and stable isotope techniques to quantitatively evaluate the extent of fluid infiltration into the dolomitic marbles, to determine the sources of the infiltrating fluids, and to define the g eometry and styel (e.g., pervasssive or channelized preferentially along structurs or bedding) of infiltration. These results will constrain numerical modelling of the thermal consequences of fluid infil- tration to heat transfer in the aureole and to total heat loss from the Alta Stock.