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Geochemistry and the Sm-Nd model age of sedimentary rocks from the lower horizon of the cover in the northeastern part of the West Siberian Platform

机译:西西伯利亚平台东北部盖下部低层沉积岩的地球化学和Sm-Nd模型年龄

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摘要

The pre-Jurassic basement and lower (Jurassic) horizons of the sedimentary cover in Hole Borovaya 6 were studied. Analysis of rare and rare-earth elements shows that Jurassic sedimentary rocks were most likely formed at the expense of erosion and mixing of heterogeneous materials, namely acid sources of the Siberian Platform and Triassic riftogenic basaltoids. The variations of Sm-147/Nd-144 (0.1076-0.1250) and Nd-143/Nd-144 (0.512202-0.512437), as well as the Sm-Nd model ages of Jurassic sediments (1146-1362 Ma), provide certain evidence for participation of the Mesoproterozoic substrate in the formation of the rocks studied. The Sm-Nd model age of pre-Jurassic rocks (1281 Ma) is Mesoproterozoic as well. The Precambrian crystalline basement of the Siberian Platform is a likely source of these sedimentary rocks.
机译:研究了Hole Borovaya 6的侏罗纪前基底和下(侏罗纪)沉积层。对稀土和稀土元素的分析表明,侏罗纪沉积岩最有可能以侵蚀和混合非均质材料(即西伯利亚台地的酸源和三叠纪裂谷玄武岩)为代价而形成。 Sm-147 / Nd-144(0.1076-0.1250)和Nd-143 / Nd-144(0.512202-0.512437)的变化以及侏罗纪沉积物(1146-1362 Ma)的Sm-Nd模型年龄有证据表明中古生代基质参与了岩石的形成。侏罗纪前岩石的Sm-Nd模型年龄(1281 Ma)也是中元古代的。西伯利亚平台的前寒武纪晶体基底可能是这些沉积岩的来源。

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    《Doklady Earth Sciences》 |2017年第1期|788-792|共5页
  • 作者单位

    Russian Acad Sci, Zavaritsky Inst Geol & Geochem, Ural Branch, Ekaterinburg, Russia;

    Russian Acad Sci, Zavaritsky Inst Geol & Geochem, Ural Branch, Ekaterinburg, Russia;

    Russian Acad Sci, Zavaritsky Inst Geol & Geochem, Ural Branch, Ekaterinburg, Russia;

    Russian Acad Sci, Zavaritsky Inst Geol & Geochem, Ural Branch, Ekaterinburg, Russia;

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