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首页> 外文期刊>Contributions to Mineralogy and Petrology >Fluid inclusion modification by H2O and D2O diffusion: the influence of inclusion depth, size, and shape in re-equilibration experiments
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Fluid inclusion modification by H2O and D2O diffusion: the influence of inclusion depth, size, and shape in re-equilibration experiments

机译：H2O和D2O扩散对流体夹杂物的改性：夹杂物深度，大小和形状在重新平衡实验中的影响

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摘要

The mobility of H2O and D2O by diffusion through quartz is illustrated with H2O-rich fluid inclusions synthesized at 600 °C and 337 MPa, within the α-quartz stability field. Inclusions are re-equilibrated at the same experimental conditions within a pure D2O fluid environment. Consequently, a gradient in volatile fugacities is the only driving force for diffusion, in the absence of pressure gradients and deformation processes. Up to 100 individual inclusions are analyzed in each experiment before and after re-equilibration by microscopic investigation, microthermometry, and Raman spectroscopy. Changes in fluid inclusion composition are obtained from the ice-melting temperatures, and density changes are obtained from total homogenization temperatures. After 1-day re-equilibration, inclusions already contain up to 11 mol % D2O. A maximum concentration of 63 mol % D2O is obtained after 40-day re-equilibration. D2O concentration profiles in quartz are determined from the concentration in inclusions as a function of their distance to the quartz surface. These profiles illustrate that deep inclusions contain less D2O than shallow inclusions. At equal depths, a variety of D2O concentration is observed as a function of fluid inclusion size: Small inclusions are stronger effected compared with large inclusions. A series of 19-day re-equilibration experiments are performed at 300, 400, 500, and 600 °C (at 337 MPa), at the same conditions as the original synthesis. The threshold temperature of diffusion is estimated around 450 °C at 337 MPa, because D2O is not detected in inclusions from re-equilibration experiments at 300 and 400 °C, whereas maximally 26 mol % D2O is detected at 500 °C. Our study indicates that the isotopic composition of natural fluid inclusions may be easily modified by re-equilibration processes, according to the experimental conditions at 600 °C and 337 MPa.
机译：通过在600°C和337 MPa的α-石英稳定性场内合成的富含H2O的流体包裹体，说明了H2O和D2O通过在石英中扩散的迁移率。在纯D2O流体环境中，在相同的实验条件下，夹杂物会重新平衡。因此，在没有压力梯度和变形过程的情况下，挥发性逸出物的梯度是扩散的唯一驱动力。在重新平衡之前和之后的每个实验中，通过显微镜研究，显微热分析和拉曼光谱法分析多达100个单个夹杂物。从冰的融化温度获得流体包裹体组成的变化，从总的均质化温度获得密度的变化。经过1天的重新平衡后，夹杂物已包含高达11 mol％的D2O。经过40天的重新平衡后，D2O的最大浓度为63mol％。石英中D2O的浓度曲线由夹杂物中的浓度决定，这些浓度取决于夹杂物与石英表面的距离。这些曲线表明，深层夹杂物比浅层夹杂物含有更少的D2O。在相同深度处，观察到各种D2O浓度随流体包裹体尺寸的变化而变化：与大包裹体相比，小包裹体的影响更大。在与原始合成相同的条件下，分别在300、400、500和600°C（337 MPa）下进行了一系列为期19天的重新平衡实验。在337MPa下，扩散的阈值温度估计为450°C左右，因为在300和400°C的重新平衡实验中未在夹杂物中检测到D2O，而在500°C时最大检测到26 mol％的D2O。我们的研究表明，根据600°C和337 MPa的实验条件，天然流体包裹体的同位素组成很容易通过重新平衡过程进行修饰。

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