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首页> 外文期刊>Contributions to Mineralogy and Petrology >Old magma and a new, intrusive trigger: using diffusion chronometry to understand the rapid-onset Calbuco eruption, April 2015 (Southern Chile)
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Old magma and a new, intrusive trigger: using diffusion chronometry to understand the rapid-onset Calbuco eruption, April 2015 (Southern Chile)

机译：旧岩浆和一个新的侵入式触发器：使用扩散编音学来了解快速发作的Calbuco Buluption，2015年4月（智利南部）

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摘要

In April 2015, an unpredicted rapid-onset eruption occurred at Calbuco Volcano, Southern Andes of Chile. This event consisted of two, sub-Plinian eruptions separated by a few hours. By analysis of Fe-Ti exchange between ilmenite and titanomagnetite crystals in samples of erupted material, we determine timescales of pre-eruptive heating experienced at the partially solidified chamber base and constrain the magma residence time for the bulk of the carrier magma. Analysis of the Fe-Ti oxide pairs from a sample retrieved from a pyroclastic density current deposit (Cal-160) shows that it was affected by a significant heating event (recording 70-220 degrees C of heating), while other collected samples did not record this late heating. This sample is interpreted to represent a piece of crystal mush located at the bottom of a prolate, ellipsoidal mush reservoir, mobilised <4days before the eruption by a triggering pulse of mafic magma considerably hotter than the typical magmatic temperature of the reservoir. Another two fall deposit samples (lapillus, Cal-149Tb and Cal-155) of the eruption are interpreted to represent resident, eruptible magmas that did not interact with any magma recharge immediately prior to or during the eruption. We infer that these magmas had been at eruption temperature for some years based on their extensively equilibrated Fe-Ti oxides.
机译：2015年4月，智利南安斯南部的Calbuco Volcano发生了一个不足的快速发作爆发。这一事件包括两个，亚普林爆发，分开几个小时。通过分析爆发材料样本中钛铁矿与钛磁石晶体的Fe-Ti交换，确定在部分固化室基底处经历的预喷发加热的时间表，并限制岩浆停留时间为载体岩浆的大部分。从从发热密度电流沉积物（CAL-160）检出的样品中的Fe-Ti氧化物对的分析表明它受到显着加热事件的影响（记录了70-220℃的加热），而其他收集的样品没有记录这一晚期加热。该样品被解释为代表位于包含椭圆形垫储存器的底部的一块水晶糊剂，在喷发之前由MAFIC岩浆的触发脉冲爆发，比储存器的典型岩岩温度更热。爆发的另外两个堕落的样品（Lapillus，Cal-149TB和CAL-155）被解释为代表常驻岩浆岩浆，其不会在爆发之前或期间立即与任何岩浆充电相互作用。我们推断这些岩浆基于其广泛的平衡的Fe-Ti氧化物一年以来一直处于喷发温度。

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