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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Geochemistry of high-Mg mafic dykes from the Bastar craton: evidence of late Archaean boninite-like rocks in an intracratonic setting
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Geochemistry of high-Mg mafic dykes from the Bastar craton: evidence of late Archaean boninite-like rocks in an intracratonic setting

机译：Bastar克拉通中高镁镁铁质岩脉的地球化学：克拉通内背景下的古代太古宙贝尼石样岩石的证据

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摘要

Mafic rocks of varying petrological and geochemical characteristics are exposed in the Bastar craton in the form of dykes as well as volcanics. Two sets of sub-alkaline mafic dyke swarms are well-recognized. The older set of sub-alkaline mafic dykes is middle Archaean, whereas the younger set is Palaeoproterozoic in age. In the present communication we report another set of mafic dyke swarms, which is also exposed in the southern part of the Bastar craton and has entirely different geochemical characteristics. This set of dyke swarms is intruded into granite gneisses and is late Archaean in age. Geochemically, these dykes contain high silica (>52%) and magnesium (~12%) and low titanium (< 0.5%), classified as boninite. Phanerozoic boninitic rocks occur exclusively in convergent margin settings and are rarely seen in Pre-cambrian terrains. In this respect, occurrence of such rocks in Bastar craton may have important tectonic implications. This communication presents preliminary results on petrological and geochemical characteristics of these high-Mg mafic dykes.
机译：岩石和地球化学特征各异的镁铁质岩石以堤坝和火山的形式暴露在Bastar克拉通中。众所周知，有两套亚碱性铁磁性堤防群。亚碱性镁铁质岩脉中年龄较大的一组是中古生界，而年龄较小的一组是古元古代。在本来文中，我们报告了另一组黑手党堤防群，它们也暴露在Bastar克拉通的南部，具有完全不同的地球化学特征。这组堤防群侵入花岗岩片麻岩中，并且是太古时代晚期。从地球化学角度看，这些堤坝含有高硅土（> 52％）和镁（〜12％）和低钛（<0.5％），被归为次硅酸盐。准生代的贝尼特质岩仅出现在会聚的边缘环境中，在前寒武纪地形中很少见到。在这方面，Bastar克拉通中此类岩石的发生可能具有重要的构造意义。本交流介绍了这些高镁铁镁质岩脉的岩石学和地球化学特征的初步结果。

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