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首页> 外文期刊>Journal of Asian earth sciences >The mafic-ultramafic complex of Aniyapuram, Cauvery Suture Zone, southern India: Petrological and geochemical constraints for Neoarchean suprasubduction zone tectonics
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The mafic-ultramafic complex of Aniyapuram, Cauvery Suture Zone, southern India: Petrological and geochemical constraints for Neoarchean suprasubduction zone tectonics

机译：印度南部Cauvery缝合带Aniyapuram的镁铁质-超镁铁质复合体：新太古代超俯冲带构造的岩石学和地球化学约束

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摘要

Several Precambrian mafic-ultramafic complexes occur along the Cauvery Suture Zone (CSZ) in Southern Granulite Terrain, India. Their origin, magmatic evolution and relationship with the associated high-grade rocks have not been resolved. The Aniyapuram Mafic-Ultramafic Complex (AMUC), the focus of the present study in southern part of the CSZ, is dominantly composed of peridotites, pyroxenites, gabbros, metagabbros/mafic granulites, hornblendites, amphibolites, plagiogranites, felsic granulites and ferruginous cherts. The rock types in the AMUC are structurally emplaced within hornblende gneiss (TTG) basement rocks and are highly deformed. The geochemical signature of the amphibolites indicates tholeiitic affinity for the protolith with magma generation in island arc-setting. N-MORB normalized pattern of the amphibolites show depletion in HFS-elements (P, Zr, Sm, Ti, and Y) and enrichment of LIL-elements (Rb, Ba, Th, Sr) with negative Nb anomalies suggesting involvement of subduction component in the depleted mantle source and formation in a supra-subduction zone tectonic setting. Our new results when correlated with the available age data suggest that the lithological association of AMUC represent the remnants of the Neoarchean oceanic lithosphere.
机译：印度南部花岗岩地区的洞穴缝合带（CSZ）上分布着几个前寒武纪镁铁质-超镁铁质复合体。它们的起源，岩浆演化以及与相关高品位岩石的关系尚未得到解决。 Aniyapuram黑铁质-超镁铁质复合体（AMUC）是本研究的重点，位于CSZ南部，主要由橄榄岩，辉石岩，辉长岩，变质辉长岩/镁铁质花岗石，角闪石，闪石，斜长岩，斜长花岗岩，长花岗岩和铁质and石组成。 AMUC中的岩石类型在结构上被安置在角闪片麻岩（TTG）基底岩石中，并且高度变形。闪石的地球化学特征表明其对原生质岩的亲和力与岛弧环境中的岩浆产生有关。 N-MORB闪石的归一化模式显示HFS元素（P，Zr，Sm，Ti和Y）耗竭，LIL元素（Rb，Ba，Th，Sr）富集，负Nb异常提示俯冲成分参与俯冲带构造环境中地幔源的贫化和形成。当我们的新结果与可用的年龄数据相关时，表明AMUC的岩性联系代表了新太古代海洋岩石圈的残余物。

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