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

根据过去两年的大量岩相学、岩石学、流体包裹体和地球化学工作（见进度报告），我们现在将试图详细地限制圣希莱尔山杂岩的晚期演化，在此期间，开发了一种不寻常的矿产资源。将收集晚期碳酸盐岩的代表性矿物化学和稳定碳和氧数据以及钠铝硅酸盐的详细矿物化学数据。这些将作为关键工具，重建密集的参数，如温度，pH值和活动的硅，NaCl和H2O的后期组合。我们将把这些数据与圣伊莱尔山早期结晶岩石的强度参数进行比较（见进度报告）。联系岩浆期与岩浆期后热液期的重建条件，可区分演化趋势的连续性和非连续性。因此，我们将尝试区分开放和封闭系统的插曲，并比较我们的结果，以了解和类似的组合从其他碱性复合物-在可能的情况下-量化的化学和物理参数，控制这些不寻常的晚期岩浆/热液矿物组合的发展。

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.