Abstract Anticipating volcanic eruptions at central volcanoes require knowing how magma chambers prepare for new eruptions. Pre-eruptive processes that occur in such magma chambers are recorded in the products of these eruptions, so their characterisation in terms of magma composition and physics offers the clues to understand past eruptions and predict future ones. Here, we study the very well preserved pyroclastic succession of El Palomar Member (712 ± 41 ka), in Las Canadas caldera, Teide, Canary Islands. This deposit resulted from a single explosive eruption of a phonolitic magma that started with a sustained eruption column (sub-plinian or plinian) that formed a massive, 40 m thick non-welded fallout deposit, progressively changing into a lower intensity fire fountain that deposited a 25 m thick fallout succession of non-welded to strongly welded pumices. Stratigraphic and petrological data suggest that this eruption was related to a thermally-compositionally zoned and relatively shallow magma chamber in which the arrival of a hotter and more mafic magma rapidly triggered the eruption. The studied deposit shows how this zoned structure was maintained during the whole process, which allows one to reconstruct what happened during the eruption. Comparison of this eruption with the current situation at Teide volcano alerts on the potential rapid preparation for new eruptions in the case that sufficient phonolitic magma was available in the shallow plumbing system of this active volcano if new inputs of deeper magma take place.

中文翻译：

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岩浆房分带对喷发动力学和沉积地层的控制：以 El Palomar 沉降演替为例（特内里费岛，加那利群岛）

摘要 预测中央火山的火山喷发需要了解岩浆房如何为新的喷发做准备。在这些岩浆房中发生的喷发前过程被记录在这些喷发的产物中，因此它们在岩浆成分和物理学方面的表征为了解过去的喷发和预测未来的喷发提供了线索。在这里，我们研究了加那利群岛泰德 Las Canadas 火山口中保存完好的 El Palomar Member (712 ± 41 ka) 的火山碎屑序列。该矿床是由音质岩浆的单次爆发性喷发造成的，该喷发以持续喷发柱（亚平层或平层）开始，形成了一个巨大的、40 m 厚的非焊接沉降沉积物，逐渐转变为强度较低的火焰喷泉，沉积了 25 m 厚的非焊接至强焊接浮石的沉降序列。地层学和岩石学数据表明，这次喷发与热成分分区和相对较浅的岩浆房有关，其中更热、更基性的岩浆的到来迅速引发了喷发。研究的矿床显示了这种分区结构在整个过程中是如何保持的，这使人们可以重建喷发期间发生的事情。将这次喷发与泰德火山的当前情况进行比较，可以提醒人们，如果发生新的更深岩浆输入，在这座活火山的浅层管道系统中有足够的音质岩浆可用的情况下，可能会迅速为新的喷发做好准备。地层学和岩石学数据表明，这次喷发与热成分分区和相对较浅的岩浆房有关，其中更热、更基性的岩浆的到来迅速引发了喷发。研究的矿床显示了这种分区结构在整个过程中是如何保持的，这使人们可以重建喷发期间发生的事情。将这次喷发与泰德火山的当前情况进行比较，可以提醒人们，如果发生新的更深岩浆输入，在这座活火山的浅层管道系统中有足够的音质岩浆可用的情况下，可能会迅速为新的喷发做好准备。地层学和岩石学数据表明，这次喷发与热成分分区和相对较浅的岩浆房有关，其中更热、更基性的岩浆的到来迅速引发了喷发。研究的矿床显示了这种分区结构在整个过程中是如何保持的，这使人们可以重建喷发期间发生的事情。将这次喷发与泰德火山的当前情况进行比较，可以提醒人们，如果发生新的更深岩浆输入，在这座活火山的浅层管道系统中有足够的音质岩浆可用的情况下，可能会迅速为新的喷发做好准备。