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A reconnaissance provenance study of Triassic–Jurassic clastic rocks of the Russian Barents Sea
GFF ( IF 1.2 ) Pub Date : 2019-09-06 , DOI: 10.1080/11035897.2019.1621372
Andrey K. Khudoley 1, 2 , Nikolay N. Sobolev 2 , Eugene O. Petrov 2 , Victoria B. Ershova 1 , Alexander A. Makariev 3 , Elena V. Makarieva 3 , Carmen Gaina 4 , Peter O. Sobolev 2
Affiliation  

ABSTRACT Combined U–Pb detrital zircon dating of 21 samples, along with whole-rock chemical composition and Sm–Nd isotopic studies of 39 samples of Triassic and Jurassic rocks from Franz Josef Land and wells in the southern part of the Russian (eastern) Barents Sea, were analyzed for a reconnaissance provenance study. The similarity of detrital zircon age distributions was statistically assessed using the Kolmogorov–Smirnov (K–S) test and points to a common source area for the clastic material of Triassic to Middle Jurassic age. Uralian-age detrital zircons predominate in all samples, with a comparably smaller portion of Caledonian- and Timanian-age detrital zircons. The number of Palaeoproterozoic and Archean grains is very small and becomes significant only in a few Jurassic samples. εNd(t) values gradually decrease from −1.5 to +2.5 in Lower Triassic rocks, to −2.0 to −8.2 in Jurassic rocks, suggesting an increasing influence of ancient metamorphic basement erosion in the younger Jurassic rocks. High Co/Th ratios, suggesting the erosion of mafic rocks, were mainly recorded in Lower Triassic rocks, whereas increasing Th/Sc ratios, suggesting the erosion of felsic rocks, were recorded only in some uppermost Triassic and Jurassic rocks. We identify the Urals and, in addition during the Triassic, the basement of the West Siberian Basin as the main provenance for the studied clastic rocks. By contrast, only a small volume of fine-grained clastic detritus was derived from basement erosion of the East European Craton, which was characterized by a subdued relief during this time.

中文翻译:

俄罗斯巴伦支海三叠系—侏罗系碎屑岩勘查物源研究

摘要 21 个样品的 U-Pb 碎屑锆石联合测年,以及 39 个三叠纪和侏罗纪岩石样品的全岩化学成分和 Sm-Nd 同位素研究,这些样品来自弗朗兹约瑟夫地和俄罗斯(东部)巴伦支海南部的井海,进行了侦察来源研究分析。碎屑锆石年龄分布的相似性使用 Kolmogorov-Smirnov (K-S) 检验进行统计评估,并指出三叠纪至中侏罗纪碎屑材料的共同源区。乌拉尔时代碎屑锆石在所有样品中占主导地位,喀里多尼亚和提马尼亚时代碎屑锆石的比例相对较小。古元古代和太古代颗粒的数量非常少,仅在少数侏罗纪样本中变得显着。εNd(t) 值从 -1.5 逐渐降低到 +2。在下三叠纪岩石中为 5,在侏罗纪岩石中为 -2.0 至 -8.2,表明古老变质基底侵蚀对年轻侏罗纪岩石的影响越来越大。高 Co/Th 比率表明基性岩石受到侵蚀,主要记录在下三叠纪岩石中,而增加的 Th/Sc 比率表明长英质岩石受到侵蚀,仅记录在一些最上层的三叠纪和侏罗纪岩石中。我们将乌拉尔山脉以及三叠纪期间的西西伯利亚盆地的基底确定为所研究碎屑岩的主要来源。相比之下,东欧克拉通的基底侵蚀仅产生少量细粒碎屑碎屑,其特征是在此期间地势减弱。表明在较年轻的侏罗纪岩石中,古代变质基底侵蚀的影响越来越大。高 Co/Th 比率表明基性岩石受到侵蚀,主要记录在下三叠纪岩石中,而增加的 Th/Sc 比率表明长英质岩石受到侵蚀,仅在一些最上层的三叠纪和侏罗纪岩石中记录。我们将乌拉尔山脉以及三叠纪期间的西西伯利亚盆地的基底确定为所研究碎屑岩的主要来源。相比之下,东欧克拉通的基底侵蚀仅产生少量细粒碎屑碎屑,其特征是在此期间地势减弱。表明在较年轻的侏罗纪岩石中,古代变质基底侵蚀的影响越来越大。高 Co/Th 比率表明基性岩石受到侵蚀,主要记录在下三叠纪岩石中,而增加的 Th/Sc 比率表明长英质岩石受到侵蚀,仅在一些最上层的三叠纪和侏罗纪岩石中记录。我们将乌拉尔山脉以及三叠纪期间的西西伯利亚盆地的基底确定为所研究碎屑岩的主要来源。相比之下,东欧克拉通的基底侵蚀仅产生少量细粒碎屑碎屑,其特征是在此期间地势减弱。而增加的 Th/Sc 比率表明长英质岩石受到侵蚀,仅在一些最上层的三叠纪和侏罗纪岩石中被记录。我们将乌拉尔山脉以及三叠纪期间的西西伯利亚盆地的基底确定为所研究碎屑岩的主要来源。相比之下,只有少量细粒碎屑碎屑来自东欧克拉通的基底侵蚀,其特征是在此期间地势减弱。而增加的 Th/Sc 比率表明长英质岩石受到侵蚀,仅在一些最上层的三叠纪和侏罗纪岩石中被记录。我们将乌拉尔山脉以及三叠纪期间的西西伯利亚盆地的基底确定为所研究碎屑岩的主要来源。相比之下,东欧克拉通的基底侵蚀仅产生少量细粒碎屑碎屑,其特征是在此期间地势减弱。
更新日期:2019-09-06
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