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首页> 外文期刊>Contributions to Mineralogy and Petrology >Bubble migration in a compacting crystal-liquid mush
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Bubble migration in a compacting crystal-liquid mush

机译：压实的结晶液糊状物中的气泡迁移

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Recent theoretical models have suggested that bubbles are unlikely to undergo significant migration in a compaction crystal mush by capillary invasion while the system remains partly molten. To test this, experiments of bubble migration during compaction in a crystal-liquid mush were modeled using deformable foam crystals in corn syrup in a volumetric burette, compacted with rods of varying weights. A bubble source was provided by sodium bicarbonate (Alka-Seltzer (R)). Large bubbles (>several crystal sizes) are pinched by the compacting matrix and become overpressured and deformed as the bubbles experience a load change from hydrostatic to lithostatic. Once they begin to move, they move much faster than the compaction-driven liquid. Bubbles that are about the same size as the crystals but larger than the narrower pore throats move by deformation or breaking into smaller bubbles as they are forced through pore restrictions. Bubbles that are less than the typical pore diameter generally move with the liquid: The liquid + bubble mixture behaves as a single phase with a lower density than the bubble-free liquid, and as a consequence it rises faster than bubble-free liquid and allows for faster compaction. The overpressure required to force a bubble through the matrix (max grain size = 5 mm) is modest, about 5 %, and it is estimated that for a grain size of 1 mm, the required overpressure would be about 25 %. Using apatite distribution in a Stillwater olivine gabbro as an analog for bubble nucleation and growth, it is suggested that relatively large bubbles initially nucleate and grow in liquid-rich channels that develop late in the compaction history. Overpressure from compaction allows bubbles to rise higher into hotter parts of the crystal pile, where they redissolve and increase the volatile content of the liquid over what it would have without the bubble migration, leading to progressively earlier vapor saturation during crystallization of the interstitial liquid. Bubbles can also move rapidly by 'surfing' on porosity waves that can develop in a compacting mush.
机译：最近的理论模型表明，当系统保持部分熔融状态时，由于毛细管侵入，气泡不太可能在压实晶体糊状物中经历明显的迁移。为了测试这一点，使用在玉米糖浆中的体积可变滴定管中的可变形泡沫晶体，用不同重量的棒压实，对在晶体-液体糊状物中压实期间的气泡迁移进行了模拟。碳酸氢钠（Alka-Seltzer（R））提供了气泡源。较大的气泡（>多个晶体尺寸）会被压实矩阵挤压，并随着气泡经历从静压到静压的载荷变化而变得过压和变形。一旦开始移动，它们的移动速度就比压实驱动的液体快得多。与晶体大小相同但大于窄孔喉的气泡由于被迫通过孔限制而变形或破裂成较小的气泡。小于典型孔径的气泡通常随液体一起移动：液体+气泡混合物以单相的形式出现，其密度低于无气泡液体，因此其上升速度比无气泡液体快，并且允许用于更快的压实。迫使气泡通过基质（最大晶粒尺寸= 5 mm）所需的过压适中，约为5％，据估计，对于1 mm的晶粒，所需的过压约为25％。使用斯蒂尔沃特橄榄石辉长岩中的磷灰石分布作为气泡成核和生长的类似物，建议相对较大的气泡最初成核并在富含液体的通道中生长，该通道在压实历史的后期发展。压实产生的超压使气泡上升到晶体堆的较热部分，在那里气泡重新溶解并增加了液体的挥发性含量，超过了气泡没有迁移的程度，从而导致间隙液体结晶过程中的蒸汽饱和逐渐提前。气泡还可以通过“冲浪”在压实糊状物中形成的孔隙波快速移动。

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