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

9316504 Baumgartner该项目涉及一项为期三年的综合实地、地球化学和建模研究，以阐明Ubehebe峰（死亡谷，加州）接触晕中硅质大理石的结晶历史。 将为硅质白云岩矿物组合制作矿物产状（等梯度图）、丰度和结构的详细露头和光环比例图。 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。 初步解释将采用简单的一维模型，以确定有前途的露头作进一步研究。 将开发一个二维有限元模型，该模型将考虑硅质白云岩系统中的变密度流体流动、传导和对流传热、稳定同位素交换和简单矿物反应。 研究结果将最终导致定性的了解与冷却的侵入体相关的热液系统的演变。

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.