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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Pyroclast textures of the Ilchulbong 'wet' tuff cone, Jeju Island, South Korea
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Pyroclast textures of the Ilchulbong 'wet' tuff cone, Jeju Island, South Korea

机译：韩国济州岛Ilchulbong湿凝灰岩锥体的Pyroclast纹理

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摘要

Jeju Island is a Quaternary shield volcano situated approximately 95 km south of the Korean Peninsula, comprising Holocene-Late Pleistocene phreatomagmatic deposits and shield-forming basaltic to trachytic lavas that overlie Early-Mid Pleistocene marine sedimentary and hydrovolcanic deposits. Ilchulbong tuff cone is among the youngest hydrovolcanic centres on the island, formed along the shoreline from a Surtseyan-style eruption involving interaction of magma with external water. We have analysed lapilli from selected sites on the volcanic edifice, in terms of vesicle population, texture, shape and size, and quantitatively, with reference to bulk vesicularity, vesicle number density, vesicle dimensions and distributions. The lapilli range in total vesicularity from low (15-35%) to high (50-80%) values, and show a modest range of vesicle number densities (N_v, number of vesicles per unit rock volume) between 2.26×10~3 and 6.97×1O~3 vesicles mm~(-3). Such vesicle number densities are higher than those typical of Strombolian (N_v between 9.3×10~1 and 1.3×1O~3 vesicles mm~(-3), Stromboli 2002, Lautze and Houghton, 2007) and Hawaiian eruptions, and more similar to those of Plinian (Nv between 1.5 and 2.5×1O~3 vesicles mm~(-3), Tarawera, Sable et al., 2009) eruptions. The lapilli studied were not strongly quenched, and we infer that the high vesicle number densities reflect a late-nucleated bubble population related in origin and formed in response to high levels of microlite growth in the Ilchulbong magma prior to final ascent.
机译：济州岛是位于朝鲜半岛以南约95公里处的第四纪盾构火山，包括全新世晚期晚更新世的岩浆沉积物以及覆盖在早中新世海洋沉积和水成火山岩上的玄武岩至曲风熔岩形成的盾构。伊丘邦凝灰岩锥是该岛上最年轻的火山中心之一，沿海岸线形成，是由苏尔塞扬式喷发形成的，涉及岩浆与外部水的相互作用。我们已经根据火山囊的数量，质地，形状和大小以及定量分析了来自火山大厦上选定地点的lapilli，并参考了整体囊泡，囊泡密度，囊泡尺寸和分布。总水泡中的lapilli范围从低（15-35％）到高（50-80％）值，并且在2.26×10〜3之间显示适度的囊泡密度范围（N_v，每单位岩石体积的囊泡数量）和6.97×1O〜3个囊泡mm〜（-3）。这样的囊泡密度高于Strombolian（N_v在9.3×10〜1和1.3×1O〜3囊泡mm〜（-3），Stromboli 2002，Lautze和Houghton，2007）和夏威夷喷发时的密度，并且更高普林期（Nv在1.5至2.5×1O〜3个囊泡mm〜（-3）之间，Tarawera，Sable等，2009）爆发。研究的lapilli并未被强烈淬灭，我们推断高囊泡数密度反映了与成年有关的晚期成核的气泡种群，并且是在最终上升之前对Ilchulbong岩浆中微晶石高水平生长的反应而形成的。

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