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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Diversity of eruptive styles inferred from the microlites of Mt Pelee andesite (Martinique, Lesser Antilles)
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Diversity of eruptive styles inferred from the microlites of Mt Pelee andesite (Martinique, Lesser Antilles)

机译：从皮利山安山岩的微岩中推断出的喷发样式的多样性（马提尼克岛，安的列斯群岛）

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摘要

We have studied the compositional and textural characteristics of plagioclase microlites from several dome-forming eruptions (dome, block-and-ash flows, and surges) and plinian fallouts of the recent period of activity of Mt. Pelee in order to infer magma ascent dynamics. Dome-forming and plinian samples display a wide range of plagioclase microlite compositions, from An_(35) to An_(90) and An_(55) to An_(90), respectively. Microlites with compositions > An_(50-60) crystallized from a mafic melt that intruded the andesitic reservoir in proportion of ～ 10 vol.%. During magma ascent in the conduit, the fraction, number density, and morphology of the decompression-induced microlites (compositions < An_(50-60) suggest that the plinian magmas experienced a nucleation-dominated crystallization regime with high undercooling. In contrast magmas from domes and block-and-ash flows were dominated by a growth regime with low undercooling, and the surges were influenced by both regimes. According to these crystallization regimes and new experimental data on H_2O content of the matrix glasses, we propose magma relative ascent rates and fragmentation pressures for the different eruptive styles observed at Mt. Pelee that may explain why surges are explosive events and why they may or may not be followed by a plinian event.
机译：我们研究了山顶活动最近几次形成的穹顶喷发（穹顶，块状灰烬流和涌动）和斜纹岩尘的斜长石微晶岩的组成和质地特征。 Pelee为了推断岩浆上升动力。形成圆顶的样品和p质样品显示了一系列斜长石微晶组成，分别从An_（35）到An_（90）和An_（55）到An_（90）。组成> An_（50-60）的微晶石是从镁铁质熔体中结晶出来的，该熔体以〜10 vol。％的比例侵入安山岩储层。在导管中的岩浆上升过程中，减压诱导的微岩的成分，数量密度和形态（组成

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