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首页> 外文期刊>Contributions to Mineralogy and Petrology >Synthetic fluid inclusions / XV. TEM investigation of plastic flow associated with reequilibration of fluid inclusions in natural quartz
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Synthetic fluid inclusions / XV. TEM investigation of plastic flow associated with reequilibration of fluid inclusions in natural quartz

机译：合成流体夹杂物/ XV。 TEM与天然石英中流体包裹体重新平衡相关的塑性流动研究

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The nature and abundance of dislocations in quartz surrounding fluid inclusions were studied to obtain better understanding of processes associated with fluid inclusion reequilibration. Synthetic fluid inclusions containing 10 wt percent NaCl aqueous solution were formed in three samples at 700 deg C and 5 kbar. One of the samples was quenched along an isochore to serve as a reference sample. The other two samples were quenched along a P-T path that generated internal pressures in excess of the confining pressure. The two samples were held at the final reequilibration P-T conditions of 625 deg C and 2 kbar for 30 and 180 days, respectively. Following the experiments, microstructures associated with fluid inclusions were examined with the TEM. Quartz in healed fractures in the reference sample that was quenched isochorically shows a moderate dislocation activity. Quartz adjacent to reequilibrated fluid inclusions in the other two samples, however, showed a marked increase in dislocation activity compared to the un-reequilibrated sample. Deformation of the inclusion walls occurred anisotropically by expansion of mobile dislocations in their Slip systems. Dislocation expansion was controlled by glide in the rhombohedral planes {1011} that was restricted to narrow zones (<=3 #mu# m) in the immediate vicinity of the fluid inclusion walls outside of the healed fracture plane. These plastic zones were observed after both short term (30 days) and long term (180 days) experiments and are attributed to hydrolytic weakening of quartz around fluid inclusions owing to diffusion of water into the quartz matrix during the experiment. The close spatial association of submicroscopic water bubbles with dislocations, and the rarity of water bubbles in the reference sample, show clearly that in both the 30 and 180 day experiments reequilibration involves water loss from the fluid inclusions. Our results indicate that synthetic fluid inclusions in this study recover (chemically and volumetrically), even at relatively fast experimental loading rates, such that internal stresses never reach the point of brittle failure. The driving force for fluid inclusion deformation involves two related mechanisms: plastic deformation of hydrolytically weakened wet quartz in the healed fracture, and water leakage associated with preexisting and strain-induced dislocations.
机译：研究了石英周围流体包裹体中位错的性质和丰度，以更好地理解与流体包裹体再平衡有关的过程。在700摄氏度和5 kbar的三个样品中形成了含有10 wt％NaCl水溶液的合成流体包裹体。沿着等时轴淬火样品中的一个作为参考样品。将其他两个样品沿P-T路径淬火，生成的内部压力超过限制压力。将这两个样品分别在625℃和2 kbar的最终再平衡P-T条件下保持30天和180天。实验之后，用TEM检查了与流体包裹体有关的微观结构。等时淬火的参考样品中愈合的骨折中的石英表现出中等的位错活性。然而，与其他未平衡样品相比，在另两个样品中与重新平衡的流体包裹体相邻的石英显示出位错活性显着增加。夹杂物壁的变形通过其滑动系统中的移动位错的扩展而各向异性地发生。位错扩展是由菱形面体{1011}中的滑行控制的，菱形面体{1011}被限制在愈合后的骨折面之外的流体包裹体壁的紧邻附近的狭窄区域（<= 3＃mu＃m）。在短期（30天）和长期（180天）实验后都观察到了这些塑性区，这归因于在实验过程中水扩散到石英基体中，流体包裹体周围的石英水解减弱。亚微观水泡与位错的紧密空间联系以及参比样品中水泡的稀有性清楚地表明，在30天和180天的实验中，重新平衡都涉及到流体包裹体的水分流失。我们的结果表明，即使在相对较快的实验加载速率下，本研究中的合成流体包裹体也可以（化学和体积）恢复，因此内应力永远不会达到脆性破坏的程度。流体包裹体变形的驱动力涉及两个相关的机制：愈合后的裂缝中水解弱化的湿石英的塑性变形，以及与既存的应变引起的位错相关的漏水。

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