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首页> 外文期刊>Contributions to Mineralogy and Petrology >Modification of fluid inclusions in quartz by deviatoric stress I: experimentally induced changes in inclusion shapes and microstructures
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Modification of fluid inclusions in quartz by deviatoric stress I: experimentally induced changes in inclusion shapes and microstructures

机译：偏应力对石英中流体包裹体的改性I：实验诱导的包裹体形状和微观结构变化

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摘要

Fluid inclusions in quartz are known to modify their shapes and microstructures (textures) during weak plastic deformation. However, such changes have not been experimentally demonstrated and criteria are not available to relate them to paleostress conditions. To address these issues, quartz crystals containing natural CO2–H2O–NaCl fluid inclusions have been experimentally subjected to compressive deviatoric stresses of 90–250 MPa at 700°C and ~600 MPa confining pressure. Strains of up to 1% cause the inclusions to develop irregular shapes and to generate microcracks in crystallographic planes oriented subperpendicular to the major compression axis, σ 1. The uniform alignment of the microcracks imparts a planar fabric to the samples. The microcracks heal and form swarms of tiny satellite inclusions. These new inclusions lose H2O by diffusion, thereby triggering plastic deformation of the surrounding quartz via H2O-weakening. Consequently, the quartz samples deform plastically only in domains originally rich in inclusions. This study shows that fluid inclusions deformed by deviatoric stresses may indeed record information on paleostress orientations and that they play a key role in facilitating crystal-plastic deformation of quartz.
机译：众所周知，石英中的流体夹杂物在微弱的塑性变形过程中会改变其形状和微结构（纹理）。但是，这种变化还没有得到实验证明，也没有标准将它们与古应力条件联系起来。为了解决这些问题，在700°C时，含有天然CO 2 –H 2 O–NaCl流体包裹体的石英晶体已经经历了90–250 MPa的压变应力。约600 MPa的围压。高达1％的应变会导致夹杂物形成不规则形状，并在垂直于主压缩轴σ 1 的结晶平面中产生微裂纹。微裂纹的均匀排列使样品具有平坦的织物。微裂纹愈合并形成微小的卫星夹杂物群。这些新的夹杂物通过扩散而损失了H 2 O，从而通过H 2 O弱化触发了周围石英的塑性变形。因此，石英样品仅在最初富含夹杂物的区域发生塑性变形。这项研究表明，由于偏应力而变形的流体包裹体确实可以记录有关古应力方向的信息，并且它们在促进石英的晶体塑性变形中起着关键作用。

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