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首页> 外文期刊>Contributions to Mineralogy and Petrology >Physical behavior of the plume source during intermittent eruptions of Hawaiian basalts
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Physical behavior of the plume source during intermittent eruptions of Hawaiian basalts

机译：夏威夷玄武岩间歇性喷发过程中羽流源的物理行为

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摘要

The plume surrounding a source region for magma may either compact by elastic or viscous deformation when magma leaves the source region. It is shown that the compaction is elastic. The elastic deformation implies that only a small volume fraction of the melt can leave the source region. On the other hand, the isotopic secular disequilibria show that the fraction melt must be much larger. This discrepancy is solved if the source region is veined and consists and intercalated veins and residuum, with the veins forming about 1 percent volume of the source region. The approximate width of the source region is estimated to be 10-20 km and its height is 1-2 km. An eruption starts when a dike is formed above the source region because of overpressure of the melt within the source region. During the repose time, the overpressure of the melt in the source region increases because of the replenishment of melt from the plume situated below.
机译：当岩浆离开源区时，围绕岩浆源区的羽流可能会通过弹性变形或粘性变形而压缩。结果表明，压实是弹性的。弹性变形意味着只有一小部分的熔体可以离开源区域。另一方面，同位素长期不平衡表明级分熔体必须大得多。如果源区域是脉状的并且由插入的静脉和残留物组成，并且这些静脉构成源区域的大约1％的体积，则可以解决此差异。源区域的大约宽度估计为10-20 km，其高度为1-2 km。当由于源极区内的熔体过压而在源极区上方形成堤坝时，喷发开始。在休止期间，由于来自位于下方的羽流的熔体的补充，源区域中熔体的超压增加。

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