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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Melt inclusion evidence for long term steady-state volcanism at Las Sierras-Masaya volcano, Nicaragua
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Melt inclusion evidence for long term steady-state volcanism at Las Sierras-Masaya volcano, Nicaragua

机译：Las Sierras-Masaya火山，尼加拉瓜长期稳态火山融化的融化证据

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Las Sierras-Masaya volcanic system is a persistently active basaltic caldera complex in Nicaragua. While there has been almost no juvenile material erupted since 1772, Masaya volcano has been persistently degassing for 150 years. An additional unusual behaviour for the Las Sierras-Masaya volcanic complex is its ability to produce large caldera-forming basaltic Plinian eruptions with the most recent occurring about 1800 years ago.Here we present melt inclusion analyses that provide constraints on the magmatic system over time. Melt inclusions hosted in plagioclase and olivine crystals were analyzed for major, trace and volatile elements (S, Cl, F, H2O). The data supports a consistent parental magmatic source with restricted compositional variability explained by simple fractional crystallization of plagioclase, olivine, clinopyroxene and magnetite at a nearly constant temperature. This broadly agrees with previous whole rock geochemical studies showing that the overall chemical signature of volcanic products at Masaya has remained largely unchanged for similar to 60,000 years and that both shallow fractionation and degassing processes dominate the whole evolution of the magmatic series. Based on volatile element in melt inclusions and gas composition and flux measurements, we determine the magmatic flux to be similar to 0.19 km(3) yr(-1) implying that up to 47 km(3) of magma may have degassed since the last effusive eruption. As at other persistently active basaltic volcanoes (e.g., Mt. Etna, Italy; Kilauea, Hawaii, USA), this magmatic flux must involve significant endogenous storage which is likely accommodated by extensional tectonics. However, Masaya volcano differs in its apparent simplicity with respect to its stable chemistry and its fully interconnected magmatic system. (C) 2019 Elsevier B.V. All rights reserved.
机译：Las Sierras-Masaya火山系统是尼加拉瓜的持续活跃的玄武岩卡尔德拉复合体。虽然自1772年以来几乎没有少年材料爆发，但Masaya火山一直在持续脱气> 150年。 Las Sierras-Masaya火山复合物的额外不寻常的行为是其产生大型火山树的玄武岩爆发，最近发生了大约1800年前的最新出现。我们呈现熔体包容性分析，这些分析随着时间的推移在岩浆系统上提供限制。分析在Plagioclase和Olivine晶体中宿主的熔体夹杂物用于主要，痕量和挥发性元素（S，Cl，F，H 2 O）。该数据支持一致的父母岩浆来源，其通过在几乎恒定温度下通过简单的分数结晶而通过简单的分数结晶来解释的具有限制性的组成可变性。这主要同意以前的全岩地球化学研究，表明，Masaya的火山产品的整体化学特征在于，类似于60,000年的浅层分馏和脱气过程占据了岩浆系列的整体演变。基于熔体夹杂物和气体组成和助焊剂测量的基于挥发性元件，我们确定类似于0.19公里（3）YR（-1）的岩浆助焊剂，暗示高达47公里（3）千米（3）千万千米（3）岩Magma可能已经脱气以来散发爆发。与其他持续活跃的玄武岩火山（例如，MT.Etna，Italy; Kilauea，Hawaii，USA），这种岩浆通量必须涉及显着的内源性储存，该储存可能是由延伸构造的。然而，对于其稳定的化学及其完全相互连接的岩浆系统，Masaya火山的显而易见。 （c）2019 Elsevier B.v.保留所有权利。

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