Digital Commons @ Michigan Tech Digital Commons @ Michigan Tech Climbing the crustal ladder: Magma storage-depth evolution Climbing the crustal ladder: Magma storage-depth evolution during a volcanic flare-up during a volcanic flare-up
Digital Commons @ Michigan Tech Digital Commons @ Michigan Tech Climbing the crustal ladder: Magma storage-depth evolution Climbing the crustal ladder: Magma storage-depth evolution during a volcanic flare-up during a volcanic flare-up
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数字共享@密歇根理工大学 数字共享@密歇根理工大学 攀登地壳阶梯：岩浆储存深度演化 攀登地壳阶梯：火山爆发期间岩浆储存深度演化
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通讯作者：
M. van Eeten
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作者：
A. Boin;M. van Eeten
非常大的喷发(>；50千米)和超级喷发(>；450千米)揭示了地球在地壳浅层生产和储存大量(>；1000千米)贫晶的可喷发岩浆的能力。我们使用石英-长石-熔体平衡压力和石英结晶时间尺度相结合的方法，探索了陶波火山带(新西兰TVZ)火山爆发期间地壳演化和火山作用之间的相互作用。在爆发过程中，结晶深度逐渐变浅，显示出地壳的逐渐条件化。然而，石英结晶时间总是非常短(<；100年)，这表明非常大的可喷发岩浆储集层是瞬变的地壳特征。我们的结论是，TVZ地壳的动力学性质有利于岩浆喷发而不是储存。断断续续地挖掘可喷发的岩浆很可能阻止了超级喷发。相反，多个非常大的可喷发岩浆聚集在一起，并以十年的时间尺度喷发。
Very large eruptions (>50 km 3 ) and supereruptions (>450 km 3 ) reveal Earth’s capacity to produce and store enor-mous quantities (>1000 km 3 ) of crystal-poor, eruptible magma in the shallow crust. We explore the interplay between crustal evolution and volcanism during a volcanic flare-up in the Taupo Volcanic Zone (TVZ, New Zealand) using a combination of quartz-feldspar-melt equilibration pressures and time scales of quartz crystallization. Over the course of the flare-up, crystallization depths became progressively shallower, showing the gradual conditioning of the crust. Yet, quartz crystallization times were invariably very short (<100 years), demonstrating that very large reservoirs of eruptible magma were transient crustal features. We conclude that the dynamic nature of the TVZ crust favored magma eruption over storage. Episodic tapping of eruptible magmas likely prevented a supereruption. Instead, multiple very large bodies of eruptible magma were assembled and erupted in decadal time scales.