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首页> 外文期刊>Geoscience frontiers >Magnetic fabrics in characterization of magma emplacement and tectonic evolution of the Moyar Shear Zone, South India
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Magnetic fabrics in characterization of magma emplacement and tectonic evolution of the Moyar Shear Zone, South India

机译：印度南部莫亚尔剪切带岩浆侵位和构造演化特征的磁性织物

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The Moyar Shear Zone (MSZ) of the South Indian granulite terrain hosts a prominent syenite pluton (～560?Ma) and associated NW-SE to NE-SW trending mafic dyke swarm (～65?Ma and 95?Ma). Preliminary magnetic fabric studies in the mafic dykes, using Anisotropy of Magnetic Susceptibly (AMS) studies at low-field, indicate successive emplacement and variable magma flow direction. Magnetic lineation and foliation in these dykes are identical to the mesoscopic fabrics in MSZ mylonites, indicating shear zone guided emplacement. Spatial distribution of magnetic lineation in the dykes suggests a common conduit from which the source magma has been migrated. The magnetic foliation trajectories have a sigmoidal shape to the north of the pluton and curve into the MSZ suggesting dextral sense of shear. Identical fabric conditions for magnetic fabrics in the syenite pluton and measured field fabrics in mylonite indicate syntectonic emplacement along the Proterozoic crustal scale dextral shear zone with repeated reactivation history. Graphical abstract Display Omitted Highlights ? Variable magma flow direction of the mafic dykes in the Moyar Shear Zone is brought out from the analysis of magnetic fabrics. ? The dyke swarms show shear zone guided emplacement. ? Spatial distribution of magnetic lineation in the dykes suggests a common conduit from which the source magma has been migrated. ? Magnetic foliation trajectories in syenite pluton indicate dextral shear sense. ? Magnetic fabrics are effectively used to establish the temporal relation between magmatism and shearing.
机译：南印度花岗岩地带的Moyar剪切带（MSZ）拥有明显的正长辉岩岩体（〜560？Ma），并伴有NW-SE与NE-SW趋势的镁铁岩脉群（〜65？Ma和95？Ma）。利用低磁场的磁化各向异性（AMS）研究，对铁镁质岩脉进行了初步的磁性构造研究，表明了连续的侵位和可变的岩浆流向。这些堤坝中的磁性线和叶状结构与MSZ镍铁矿中的介观织物相同，表明剪切带导向的位置。堤中磁线的空间分布表明源岩浆已从中迁移出一条公共管道。磁叶轨迹在子体的北部呈S形，并弯曲成MSZ，表明右旋剪切。正长岩体中磁性织物和my石中实测织物的织物条件相同，表明沿元古代地壳尺度右旋剪切带的共面构造，具有重复的活化历史。图形摘要显示省略的突出显示？从磁性织物的分析中得出了莫亚尔剪切带中的铁镁质岩浆的可变岩浆流动方向。 ？堤群显示了剪切带引导的位置。 ？堤中磁线的空间分布表明源岩浆已从中迁移出一条公共管道。 ？正弦岩体中的磁叶轨迹表明右旋剪切感。 ？磁性织物有效地用于建立岩浆作用和剪切之间的时间关系。

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