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首页> 外文期刊>Chemical geology >Salinity and density modifications of synthetic H2O and H2O-NaCl fluid inclusions in re-equilibration experiments at constant temperature and confining pressure
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Salinity and density modifications of synthetic H2O and H2O-NaCl fluid inclusions in re-equilibration experiments at constant temperature and confining pressure

机译：恒温恒压下的平衡实验中合成H2O和H2O-NaCl流体包裹体的盐度和密度变化

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Experiments have been performed to elucidate post-entrapment modifications of natural fluid inclusions. Synthetic H2O and H2O-NaCl fluid inclusions in quartz were re-equilibrated at 599.7-600.7 degrees C and 332.6-338.3 MPa in hydrothermal autoclaves, and subjected to H2O fugacity gradients at similar temperature and hydrostatic pressure conditions to those of the original syntheses. Individual inclusions in specific assemblages were analyzed in detail, i.e. size, shape, depth, homogenization and ice-dissolution temperatures, before and after the re-equilibration experiments. Accurate loading and unloading of the samples along isochoric T-p paths require monitoring the temperature at the sample within the autoclaves. Multiple loading and unloading of the samples along these paths do not affect the properties of fluid inclusions. Synthetic H2O fluid inclusions are not modified after re-equilibration in a pure H2O fluid, but reveal significantly higher homogenization temperatures after re-equilibration in 20 mass% NaCl solution. Synthetic NaCl-H2O fluid inclusions with 10, 16.3 and 19.8 mass% NaCl reveal higher salinities after re-equilibration in a pure H2O fluid, and highly variable homogenization temperatures: positive as well as negative modifications. The magnitude of modifications indicates that two processes must have operated simultaneously to obtain the observed homogenization and dissolution temperatures in individual inclusions: (1) preferential H2O loss via diffusion; and (2) total volume loss by diffusion of quartz into the former inclusion volume. These processes are inconsistent with the expected H2O diffusion into inclusions according to the applied fugacity gradients in the experimental setup. These simultaneously operating processes are suggested to be the main modification method of natural fluid inclusions in a variety of experimental settings and in geological environments. (C) 2016 Elsevier B.V. All rights reserved.
机译：已经进行了实验以阐明天然流体包裹体的包埋后修饰。石英中的合成H2O和H2O-NaCl流体包裹体在热液高压釜中在599.7-600.7摄氏度和332.6-338.3 MPa下重新平衡，并在与原始合成相似的温度和静水压条件下经历H2O逸度梯度。在重新平衡实验之前和之后，详细分析了特定组合中的单个夹杂物，即大小，形状，深度，均质化和溶冰温度。沿等速T-p路径准确加载和卸载样品需要监控高压釜内样品的温度。沿着这些路径多次加载和卸载样品不会影响流体包裹体的特性。在纯H2O流体中重新平衡后，合成的H2O流体夹杂物未变质，但在20质量％NaCl溶液中重新平衡后，显示出明显更高的均质温度。含有10％，16.3％和19.8％NaCl的合成NaCl-H2O流体夹杂物在纯H2O流体中重新平衡后显示更高的盐度，并且均质温度变化很大：正向和负向修饰。修饰的幅度表明，必须在两个过程中同时进行操作才能获得单个夹杂物中观察到的均质化和溶解温度：（1）通过扩散优先损失H2O; （2）由于石英扩散到原来的夹杂物体积而造成的总体积损失。这些过程与根据实验设置中应用的逸度梯度所预期的H2O扩散到夹杂物中不一致。这些同时运行的过程被认为是在各种实验环境和地质环境中对天然流体包裹体的主要改性方法。 （C）2016 Elsevier B.V.保留所有权利。

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