Fast melt expulsion from crystal-rich mushes via induced anisotropic permeability
Fast melt expulsion from crystal-rich mushes via induced anisotropic permeability
复制标题
通过诱导各向异性渗透率从富含晶体的糊状物中快速熔体排出
DOI：
10.1016/j.epsl.2021.117113
复制
发表时间：
2021
影响因子：
5.3
通讯作者：
Cin
中科院分区：
文献类型：
--
作者：
Boda Liu;Cin
流纹岩超级火山的灾难性爆发需要大量的岩浆从富含晶体的糊状物中高速提取。然而，快速熔体提取被认为是困难的，因为浆料的低渗透性和高粘度熔体的高粘度。在这里，我们表明，诱导短暂的高渗透性途径的糊状物可能是至关重要的。在单轴压缩的糊状物，从下面的充电岩浆的冲击驱动，糊状物内的熔体可以重新分配到垂直熔体袋优先。熔体的这种重新分布可以使垂直渗透率增加10 - 100倍，这导致熔体的快速排出。随着熔体的排出，渗透率迅速下降。最终的结果是一个快速、短暂的熔体提取脉冲，可以在10 kyr内形成1 km厚的岩浆库。我们的分析表明，深部岩浆侵入地壳中富含晶体的糊状物的底部，可以引发可能导致火山喷发的岩浆熔体的排出。
Catastrophic eruptions of rhyolitic super volcanoes require large volumes of silicic magma to be extracted from a crystal-rich mush at high rates. However, fast melt extraction is thought to be difficult because of the low permeability of mushes and the high viscosities of silicic melts. Here, we show that induced ephemeral high permeability pathways in the mush may be critical. During uniaxial compression of the mush, driven by the impingement of recharging magmas from below, melt within the mush can be redistributed preferentially into vertical melt pockets. This redistribution of melt can increase vertical permeability by a factor of 10-100 times, which leads to rapid expulsion of melt. As melt is expelled, the permeability rapidly declines. The end result is a fast, short-lived pulse of melt extraction that can grow a 1 km thick silicic magma reservoir in 10 kyr. Our analysis shows how the incursion of deep-seated magmas into the base of a crystal-rich mush in the crust can trigger the expulsion of silicic melts that may lead to an eruption.
影响因子：
5.3
作者：
Miller, Kevin J.;Zhu, Wen-lu;Gaetani, Glenn A.
通讯作者：
Gaetani, Glenn A.