The Effect of Crystal Plastic Deformation of Quartz in Removing H2O From Fluid Inclusions Containing CO2+H2O

纯净的二氧化碳流体包裹体通常出现在变质岩中，已知这些变质岩是在富含H20的流体存在下结晶的。密度与峰期变质条件一致，但组成不一致。该项目将研究参与石英晶体塑性流动和动态重结晶的过程可能会导致包裹体中的H2O损失，而二氧化碳仍留在宿主石英中。将利用手标本中显示应变梯度的变质岩样品来确定流体包裹体的成分和密度随应变梯度的变化和变形机制的变化。这些结果有望阐明纯CO2包裹体的成因，并可能为高温变形机制的研究提供新的视角。

Pure CO2 fluid inclusions commonly occur in metamorphic rocks which are known to have crystallized in the presence of an H20-rich fluid. Densities are consistent with peak metamorphic conditions, but their composition is not. This project will investigate the possibility that processes attending crystal plastic flow and dynamic recrystallization of quartz may result in loss of H2O from inclusions, with CO2 remaining in the host quartz. Samples of metamorphic rocks showing strain gradients in hand specimen will be utilized to determine the variations of composition and density of fluid inclusions in relation to gradients in strain and variations of deformation mechanisms. Results are expected to clarify origins of pure CO2 inclusions and may provide a new perspective for studies of high temperature deformation mechanisms.