ABSTRACT Upper Triassic sandstones from Mendeleev Rise were analyzed and compared to turbiditic sandstones of the same age from Wrangel Island and Chukotka, Arctic Sea region. Medium-grained lithic arenites dominate all of these. The quartz content is higher in the sandstones from Mendeleev Rise than in those from Wrangel Island and Chukotka. Abundant quartz grains with microfractures and kaolinized feldspar are characteristic of the samples from Mendeleev Rise, whereas such features are lacking in the other areas. Quartz with microfractures is less abundant in Triassic turbidite sandstones of Chukotka and Wrangel and kaolinized feldspar is not present. Upper Triassic sandstones of Mendeleev Rise are characterized by a high Chemical Index of Alteration indicating intensive weathering in the source province. All sandstones have Th/Sc ratios ≤1. The chemical composition of sandstones suggests a quartzose sedimentary province for sandstones of Mendeleev Rise, an intermediate igneous province for Wrangel Island sandstones, and a mafic igneous provenance for Chukotka sandstones. Detrital zircon populations are similar in all Upper Triassic sandstones samples with a dominance of Paleozoic zircon. Facies studies of Triassic deposits in the Eastern Arctic of Russia indicate that sandstones from Mendeleev Rise were located near a continent and formed in a shallow or coastal-marine setting. Triassic deposits of Wrangel Island and Chukotka were deposited in a deeper marine environment.

中文翻译：

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楚科奇、弗兰格尔岛和北海门捷列夫海隆三叠纪沉积物：沉积学和地球动力学意义

摘要 对门捷列夫海隆上三叠统砂岩进行了分析，并将其与弗兰格尔岛和北冰洋地区楚科奇的同龄浊积砂岩进行了比较。中粒岩屑砂岩在所有这些中占主导地位。门捷列夫隆起砂岩的石英含量高于弗兰格尔岛和楚科奇的砂岩。丰富的微裂缝石英颗粒和高岭土长石是门捷列夫海隆样品的特征，而其他地区缺乏这些特征。具有微裂缝的石英在楚科奇和弗兰格尔的三叠纪浊积砂岩中较少，并且不存在高岭化长石。门捷列夫隆起上三叠统砂岩的特点是化学蚀变指数高，表明源区发生了强烈的风化作用。所有砂岩的 Th/Sc 比均≤1。砂岩的化学成分表明，门捷列夫隆起的砂岩属于石英沉积区，弗兰格尔岛砂岩属于中间火成岩区，楚科奇砂岩属于镁铁质火成岩源。碎屑锆石群在所有上三叠统砂岩样品中相似，古生界锆石占优势。对俄罗斯北极东部三叠纪沉积物的相研究表明，门捷列夫隆起的砂岩位于大陆附近，形成于浅层或沿海海洋环境中。弗兰格尔岛和楚科奇的三叠纪沉积物沉积在更深的海洋环境中。和楚科奇砂岩的镁铁质火成岩出处。碎屑锆石群在所有上三叠统砂岩样品中相似，古生界锆石占优势。对俄罗斯北极东部三叠纪沉积物的相研究表明，门捷列夫隆起的砂岩位于大陆附近，形成于浅层或沿海海洋环境中。弗兰格尔岛和楚科奇的三叠纪沉积物沉积在更深的海洋环境中。和楚科奇砂岩的镁铁质火成岩出处。碎屑锆石群在所有上三叠统砂岩样品中相似，古生界锆石占优势。对俄罗斯北极东部三叠纪沉积物的相研究表明，门捷列夫隆起的砂岩位于大陆附近，形成于浅层或沿海海洋环境中。弗兰格尔岛和楚科奇的三叠纪沉积物沉积在更深的海洋环境中。