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首页> 外文期刊>Economic Geology >Vigorous Exsolution of Volatiles in the Magma Chamber beneath a Hydrothermal System on the Modern Sea Floor of the Eastern Manus Back-Arc Basin, Western Pacific: Evidence from Melt Inclusions
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Vigorous Exsolution of Volatiles in the Magma Chamber beneath a Hydrothermal System on the Modern Sea Floor of the Eastern Manus Back-Arc Basin, Western Pacific: Evidence from Melt Inclusions

机译:西太平洋东马努斯弧形盆地现代海床下热液系统下方岩浆腔中挥发物的剧烈释放:来自熔体包裹体的证据

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摘要

Image analyses and ion probe analyses were carried out on melt inclusions in olivine, pyroxene, and plagioclase phenocrysts of vesicular volcanic rocks that host the actively forming massive sulfides at the PACMANUS hydrothermal field in the eastern Manus back-arc basin, western Pacific. The melt inclusions, ranging in size from 150 µm, contain one or more bubbles. Most of them have bubble/melt inclusion volume ratios (Vb/Vm) of >5.5 vol percent, higher than those for the melt inclusions with their bubbles generated from shrinkage (Vb/Vm, 3.6 vol %) or postentrapment exsolution of volatiles (Vb/Vm, 3.7 vol %). This, together with the presence of vapor bubbles with little melt (Vb/Vm, 80 to >95 vol %) in pyroxene and olivine phenocrysts, suggests that a vapor phase was formed from vigorous exsolution of volatiles or the boiling of a magma in the crystallizing magma chamber. The Vb/Vm ratios show distinct distribution patterns in the phenocryst minerals, indicating that there was more than one vesiculation event in the magma chamber.
机译:图像分析和离子探针分析对囊泡火山岩中橄榄石,辉石和斜长石隐晶质 中的熔融 夹杂物进行了西太平洋东部Manus 弧后盆地PACMANUS热液场中的>硫化物。熔体夹杂物的尺寸为 ,范围为150 µm,其中包含一个或多个 气泡。其中大多数气泡/熔体夹杂物体积比 (V b / V m )大于5.5%(体积),高于熔体 包含物,其气泡是由收缩(V b / V m 3.6 vol%)或捕集后的析出产生的挥发物(V b / V m 3.7体积%)。这与在辉石中的蒸气气泡 的存在以及熔融物中几乎没有熔体(V b / V m ,体积百分比为80至95%)的熔体和 橄榄石隐晶晶表明,在结晶岩浆室内剧烈挥发出挥发物或岩浆 会形成汽相。 V b / V m 比在隐晶矿物中表现出明显的 分布规律,表明 室中发生了一次囊泡化事件。

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  • 来源
    《Economic Geology》 |2005年第6期|00001085-00001096|共12页
  • 作者

    Kaihui Yang; Steven D. Scott;

  • 作者单位

    Scotiabank Marine Geology Research Laboratory, Department of Geology, University of Toronto, 22 Russell St., Toronto, Canada M5S 3B1;

    Scotiabank Marine Geology Research Laboratory, Department of Geology, University of Toronto, 22 Russell St., Toronto, Canada M5S 3B1;

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