Lithological and Mineralogical Characteristics of Bottom Sediments in Ice-Scoured Areas in the Southwestern Kara Sea

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2024-04-02 DOI:10.1134/S0024490223700487

E. A. Sukhikh, O. V. Kokin, A. G. Roslyakov, R. A. Ananiev, V. V. Arkhipov

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Abstract

Sedimentary material sampled in the southwestern Kara Sea both directly in ice scours and on background surfaces undisturbed by ice scouring has been studied. Based on studies of the physical properties and lithomineralogical features of bottom sediments in the ice scours, the boundary of ice scouring impact (exaration contact) was identified. Based on the X-ray diffraction analysis of <0.001-mm fraction, the chlorite structure is sensitive to temperature in samples taken below this contact, in contrast to the overlying samples. Together with the results of microscopic studies of thin sections, this fact indicates the neoformation of chlorite. The presence of secondary chlorite in near-surface conditions can suggest the glaciodynamic impact (pressure) of iceberg keels on bottom sediments. Microstructures of the ice scour sediments differ both in different test sites of the study area and within the same scour, depending on the location of sampling point on the transverse profile of morphosculpture.

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喀拉海西南部冰蚀地区海底沉积物的岩石学和矿物学特征

摘要对喀拉海西南部冰冲刷区和未受冰冲刷扰动的背景表面的沉积物取样进行了研究。根据对冰冲刷区底部沉积物的物理性质和岩石矿物学特征的研究，确定了冰冲刷影响（剥离接触）的边界。根据对 0.001 毫米馏分的 X 射线衍射分析，与上覆样本相比，在该接触面以下采集的样本中，绿泥石结构对温度非常敏感。结合薄片的显微研究结果，这一事实表明了绿泥石的新形成。在近地表条件下出现的次生绿泥石表明冰山龙骨对海底沉积物产生了冰川动力影响（压力）。冰冲刷沉积物的微观结构在研究区的不同试验点和同一冲刷区内都有所不同，这取决于取样点在形态构造横剖面上的位置。

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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.