Analysis of the Sedimentary and Geochemical Characteristics of Sedimentary Clastic Rock Samples from the Alpha–Mendeleev Rise

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Lithology and Mineral Resources Pub Date : 2024-05-09 DOI:10.1134/S0024490224700500

M. I. Tuchkova, S. G. Skolotnev, S. D. Sokolov, S. A. Sergeev

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Abstract

The paper presents new data on a comparative analysis of sedimentary rocks from the Mendeleev Rise (Shamshura Seamount), presumably, of the Triassic age with the Aptian sandstones obtained by the underwater sampling of the Alpha–Mendeleev Rise during expeditions in 2012, 2014, and 2016. The geochemical characteristics of rocks are very similar, and the data from different-age samples form common fields on various diagrams. Petrographic studies revealed that the sandstones of presumably Late Triassic age, as well as the sandstones of Chukotka and Wrangel Island, are dominated by fragments of shale and felsic effusives. The Aptian samples are dominated by mafic rock fragments. In addition, sharp differences are observed in the age spectra of detrital zircon populations, indicating fundamentally different provenances for the Triassic and Cretaceous sandstones on the Alpha–Mendeleev Rise. Samples from the Shamshura Seamount are characterized by populations similar to those from Triassic rocks of Chukotka and Wrangel Island, suggesting the presence of Triassic rocks in this part of the Mendeleev Rise.

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阿尔法-门捷列夫海隆沉积碎屑岩样本的沉积和地球化学特征分析

摘要本文介绍了对门捷列夫海隆（Shamshura Seamount）沉积岩的对比分析新数据，推测这些沉积岩的时代为三叠纪，而阿尔法-门捷列夫海隆（Alpha-Mendeleev Rise）在 2012 年、2014 年和 2016 年的考察中通过水下取样获得的是万古砂岩。岩石的地球化学特征非常相似，不同年代样本的数据在各种图表上形成了共同的区域。岩石学研究表明，推测为晚三叠世的砂岩以及楚科奇和弗兰格尔岛的砂岩主要由页岩碎片和长英质流出物组成。始新世的样本则以岩浆岩碎片为主。此外，在碎屑锆石群的年龄谱上也发现了明显的差异，这表明阿尔法-门捷列夫海隆上的三叠纪砂岩和白垩纪砂岩的产地根本不同。来自沙姆舒拉海山的样本具有与楚科奇和弗兰格尔岛三叠纪岩石相似的族群特征，表明门捷列夫海隆的这一部分存在三叠纪岩石。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Lithology and Mineral Resources 地学-地球化学与地球物理

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.