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Geochemical Indicators of “Camouflaged” Pyroclastic Material in the Upper Jurassic–Lower Cretaceous Deposits of the Eastern Russian Platform
Doklady Earth Sciences ( IF 0.9 ) Pub Date : 2020-08-01 , DOI: 10.1134/s1028334x2008022x
S. O. Zorina , K. I. Nikashin , M. Yu. Sokerin

Based on the results of studying the lithological–geochemical features of the Upper Jurassic–Lower Cretaceous mudrocks and black shales in the Eastern Russian Platform, the continuous distribution of pyroclastic material in the whole section is established. Possible sources of acid pyroclastics were active volcanoes of the Transcaucasian ensialic island arc. The explosions of the Sanandaj–Senjan ensimatic island arc (in the Late Jurassic) and the Arctic Large Igneous Province (in the Aptian) could have been the source of basaltic pyroclastics in the black shale horizons. The highest activity of the Transcaucasian and Elburs island arcs in northwest Tethys was apparently recorded during the Albian, which determined the maximum content of felsitic material in the Middle Albian bentonite-like mud rocks.

中文翻译:

俄罗斯东部地台上侏罗统-下白垩统矿床“伪装”火山碎屑物质地球化学指标

根据俄罗斯东部地台上侏罗统—下白垩统泥岩和黑色页岩岩性地球化学特征研究结果,确定了全剖面火山碎屑物质的连续分布。酸性火山碎屑的可能来源是外高加索岛弧的活火山。Sanandaj-Senjan 火山岛弧(侏罗纪晚期)和北极大火成岩省(Aptian)的爆发可能是黑色页岩层中玄武质火山碎屑的来源。特提斯西北部的外高加索岛弧和厄尔伯斯岛弧的最高活动明显记录在阿尔布时期,这决定了中阿尔布时期类膨润土泥岩中长英质物质的最大含量。
更新日期:2020-08-01
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