Petrological and geochemical evolution of the alkaline Mont Saint-Hilaire complex, Montreal area, Quebec, Canada

基于过去两年密集的岩石学、岩石学、流体包裹体和地球化学工作(见进展报告)，我们现在将试图详细限制圣希莱尔山杂岩在其间形成不同寻常的矿产财富的后期演化。将收集具有代表性的晚期碳酸盐的矿物化学和稳定的碳氧数据以及详细的钠铝硅酸盐矿物化学数据。这将成为重建后期组合的温度、pH、硅酸盐、氯化钠和水的活度等密集参数的关键工具。我们将把这些数据与圣希莱尔山早期结晶岩石中的密集参数进行比较(见进展报告)。将岩浆阶段的重构条件与岩浆后热液阶段相联系，将区分演化趋势中的连续和不连续行为。因此，我们将尝试区分开放和闭合的系统幕，并将我们的结果与其他碱性杂岩的类似组合进行比较，以便了解并在可能的情况下量化控制这些不寻常的晚期岩浆/热液矿物组合发展的化学和物理参数。

Based on intensive petrographic, petrologic, fluid inclusion and geochemical work of the past 2 years (see progress report), we will now try to constrain in detail the late-stage evolution of the Mont Saint- Hilaire complex during which an unusual mineral wealth developed. Representative mineral chemistry and stable carbon and oxygen data of late-stage carbonates and detailed mineral chemistry data of Na-Al-silicates will be collected. These will serve as key tools for reconstructing intensive parameters like temperature, pH and activities of silica, NaCl and H2O of late-stage assemblages. We will compare these data to intensive parameters in the earlier crystallized rocks from Mont Saint-Hilaire (see progress report). Relating the conditions reconstructed for the magmatic stage to the postmagmatic hydrothermal stage, continuous and discontinuous behavior in evolutionary trends will be distinguished. We will thus try to distinguish between open and closed system episodes and compare our results to similar assemblages from other alkaline complexes in order to understand and – where possible – quantify the chemical and physical parameters which control the development of these unusual late-magmatic/hydrothermal mineral assemblages.