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首页> 外文期刊>Contributions to Mineralogy and Petrology >Outcrop-scale silicate liquid immiscibility from an alkali syenite (A-type granitoid)-pyroxenite association near Puttetti, Trivandrum Block, South India
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Outcrop-scale silicate liquid immiscibility from an alkali syenite (A-type granitoid)-pyroxenite association near Puttetti, Trivandrum Block, South India

机译：印度南部特里凡得琅街区普特蒂附近的碱性正长岩（A型花岗岩）-辉绿岩结合体与露头尺度的硅酸盐液体不混溶

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摘要

The Pan-African (572 Ma) Puttetti syenite (A-type granitoid)-pyroxenite association intrudes the high-grade metamorphic terrain of the Trivandrum Block, South India. Field evidence indicates the contemporaneous nature of syenitic and pyroxenitic liquids. The occurrence of a mixed-rock (~70% syenite and 30% pyroxenite) with an emulsion-like texture, and the occurrence of pyroxenite globules in syenite, is interpreted as relics of immiscible magmas. Both syenite and pyroxenite show similar mineral assemblage (with major minerals having overlapping compositions), but the relative proportions differ. Major element and trace element partitioning trends, parallel REE patterns, and similar Sr initial isotope compositions are in accord with behavior either predicted or measured for immiscible melts in experimental and/or natural systems. The more pronounced Eu anomalies and LREE/HREE ratios of syenite and pyroxenite (relative to the mixed-rock) is related to fractionation caused by immiscible separation. The proposed origin of the Puttetti pluton involves the intrusion of a magma whose bulk composition is that of the mixed-rock. This melt behaved immiscibly and split into two fractions, which produced the syenite and pyroxenite magmas.
机译：泛非（572 Ma）的Puttetti绢云母（A型花岗岩）-辉石岩组合侵入了印度南部Trivandrum区块的高级变质带。现场证据表明，同时存在液体和共沸液体。乳状结构的混合岩石（约70％的辉石和30％的辉石）的出现，以及辉石中辉石的小球的出现，被解释为不混溶岩浆的遗迹。堇青石和辉绿岩都显示出相似的矿物组合（主要矿物具有重叠的组成），但相对比例不同。主要元素和痕量元素的分配趋势，平行的REE模式以及相似的Sr初始同位素组成均与针对实验和/或自然系统中不溶混熔体的预测或测量行为相符。较明显的Eu异常和正长岩与辉石的LREE / HREE比（相对于混合岩）与不混溶分离引起的分馏有关。拟议的Puttetti岩体的起源涉及岩浆的侵入，该岩浆的整体成分为混合岩的成分。该熔体的行为不混溶，分成两个部分，产生了正长岩和辉绿岩岩浆。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2003年第5期|612-627|共16页
  • 作者

    H. M. Rajesh;

  • 作者单位

    Gondwana Institute for Geology and EnvironmentDepartment of Geosciences The University of Queensland;

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