Lithogeochemistry of Silty–Pelitic Bottom Sediments in the Southwestern Kara Sea

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Lithology and Mineral Resources Pub Date : 2025-02-17 DOI:10.1134/S0024490224700834

A. V. Maslov, D. P. Starodymova, I. A. Migdisova, N. V. Kozina, E. A. Novichkova, T. N. Alekseeva, V. P. Shevchenko

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Abstract

Lithogeochemical characteristics of the pelitic and silty–pelitic bottom sediment samples, collected during Cruise 89 of the R/V Akademik Mstislav Keldysh (September 2022), from several areas in the southwestern Kara Sea (Baidaratsk Bay, Pukhuchansk Depression, West Kara Step, and Novaya Zemlya Depression) are discussied. It has been established that the muds contain a significant proportion of the lithogenic component. This conclusion agrees well with the localization of sediment data points on various discriminant diagrams near the reference points of average Paleozoic graywackes and PAAS. Such component could be sourced either from the fine-grained suspended particulates of the Ob River or from the sedimentary rocks and friable sediments of the Yamal and Yugra Peninsulas, Vaigach, and Novaya Zemlya. Although the upper layer of bottom sediments in the southwestern Kara Sea contains a noticeable amount of the mafic igneous rock fragments from Novaya Zemlya, which should make a significant contribution to their erosion products in the mud composition, parameters of the chondrite-normalized REE distribution in the sediments are inconsistent with such assumption.

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西南喀拉海粉砂质-泥质底沉积物的岩石地球化学

讨论了R/V Akademik Mstislav Keldysh号（2022年9月）在喀拉海西南部几个地区（拜达拉茨克湾、普库尚斯克坳陷、西喀拉阶和新地岛坳陷）采集的泥质和粉质泥质底部沉积物样品的岩石地球化学特征。已经确定，泥浆中含有相当比例的成岩成分。这一结论与在古生代平均灰纹和PAAS参考点附近的各种判别图上沉积数据点的定位是一致的。这种成分既可以来自鄂毕河的细粒悬浮颗粒，也可以来自亚马尔半岛和尤格拉半岛、Vaigach和新地岛的沉积岩和易碎沉积物。尽管西南喀拉海底部沉积物上层含有大量的新地岛基性火成岩碎屑，这些碎屑在泥的组成中应该对它们的侵蚀产物有重要贡献，但沉积物中球粒陨石归一化稀土分布参数与这一假设不一致。

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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.