Case Studies of Fluid-Rock Interaction in Siliceous Dolomites During Contact Metamorphism: A Field and Modeling Study

该项目包括为期三年的综合野外、地球化学和建模研究，以阐明Ubehebe峰（加州死亡谷）接触光圈中硅质大理岩的结晶历史。将绘制硅质白云岩矿物组合的详细露头图和光晕尺度图（等梯度图）、丰度图和结构图。该数据集将补充硅质白云岩单元内碳酸盐和硅酸盐矿物的稳定同位素和微量元素地球化学。最初的解释将采用简单的一维模型来确定有希望的露头以供进一步研究。将建立一个二维有限元模型，该模型将考虑变密度流体流动，导电和对流传热，稳定同位素交换以及硅质白云岩系统中的简单矿物反应。研究结果将最终导致对与侵入体冷却相关的热液系统演化的定性认识。

9316504 Baumgartner The project involves a three-year integrated field, geochemical and modelling study to illuminate the crystallization history of siliceous marbles in the Ubehebe Peak (Death Valley, California) contact aureole. Detailed outcrop and aureole scale maps of mineral occurrence (isograd maps), abundance and textures will be made for the siliceous dolomite mineral assemblages. This data set will be complemented with stable isotope and trace element geochemistry of carbonate and silicate minerals within the siliceous dolomite units. Initial interpretations will employ simple one-dimensional models to identify promising outcrops for further study. A 2-D finite element model will be developed which will account for variable-density fluid flow, conductive and advective heat transfer, stable isotope exchange, and simple mineral reactions in the siliceous dolomite system. Results of the study will ultimately lead to qualitative understanding of the evolution of the hydrothermal system associated with the cooling of the intrusion.