Magnesite-Dolomite Equilibrium in Fluids Between 100 and 200oC

该提案描述了一个为期三年的研究计划， 镁白云石平衡在100至 200oC。将进行一至四个月的去铁化实验 在Na-Mg-Ca-Cl卤水中， 菱镁矿沉淀，溶解后的“有序” 化学计量白云石 实验过程已经 在七周的去离子化中成功测试， Stoessell et.（1987），其中方解石-白云石 在相同的温度范围内接近平衡。 的 反应后的固体将用X射线衍射进行检验 技术，岩相显微镜，扫描电子显微镜 显微镜和电子探针。 研究数据 将填补菱镁矿的实验空白 在100至200 ℃范围内平衡。 结果将（1）帮助 解出菱镁矿-菱镁矿平衡位置 （2）有助于确定白云岩的稳定场。

This proposal describes a three year research program to study magnesite-dolomite equilbria in the temperature range of 100 to 200oC. One to four month dedolomitization experiments will be run in Na-Mg-Ca-Cl brines in which equilibrium is approached by magnesite precipitation, following dissolution of "ordered" stoichiometric dolomite. The experimental procedure has been successfully tested in the seven week dedolomitization experiments of Stoessell et. al. (1987) in which calcite-dolomite equilibria was approached over the same temperature range. The reacted solids will be examined with X-ray diffraction techniques, petrographic microscopy, scanning electron microscopy, and by an electron microprobe. Data from the study will fill in the experimental gap on dolomite-magnesite equilibria in the 100 to 200oC range. The results will (1) help resolve the location of the dolomite-magnesite equilibrium boundary and (2) help define the stablity field of dolomite.