Литогеохимические и палинологические показатели палеоклимата раннего плиоцена в озерных отложениях из разреза манзурского аллювия (Предбайкалье)

IF 0.8 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Italian Journal of Engineering Geology and Environment Pub Date : 2022-01-01 DOI:10.26516/2541-9641.2022.1.45

S. Rasskazov, A. A. Hamud, A. Hassan, N.V. Kulagina, I.S. Chuvashova, T. Yasnygina, R.C. Budaev

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Abstract

The Manzurka alluvium is a polychronous complex of accumulations of sand and pebbles in the Pliocene-Early Pleistocene Proto-Manzurka paleovalley. Layers of fine-grained (aleurite and clay) material are rare in the alluvium. In the earliest (Buguldeika) alluvial horizon of the paleovalley, a 3-meter lacustrine lens of horizontally layered fine-fragmented sediments was found, in which a fairly uniform composition of spore-pollen spectra was determined and a distinct change in lithogeochemical indicators from weak weathering of material in the foot to strong – in the roof of the lens was revealed. From change in the lithogeochemical characteristics of the lacustrine sediments, an episode of early Pliocene paleoclimatic variations of cold and heat was established. It occurred on background of the conservative existence of forest vegetation of warm and humid climate.

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在曼祖尔冲刺(前比加尔湖)的湖泊沉积中，石化地质和古新世早期气候特征

曼祖尔卡冲积层是上新世-早更新世原曼祖尔卡古山谷的多时相砂砾石堆积复合体。在冲积层中，细密的层状(无灰长晶石和粘土)材料很少见。在古河谷最早的(Buguldeika)冲积层位，发现了一个3米的水平层状细粒状沉积物湖相透镜体，确定了孢子-花粉谱组成相当均匀，岩石地球化学指标呈现出明显的变化，从底部的物质风化弱到透镜体顶部的物质风化强。根据湖相沉积物岩石地球化学特征的变化，建立了早上新世的冷热古气候变化集。它发生在温暖湿润气候下森林植被保守存在的背景下。

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来源期刊

Italian Journal of Engineering Geology and Environment GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

1.30

自引率

8.30%

发文量

期刊介绍： Italian Journal of Engineering Geology and Environment (IJEGE), published by Sapienza Università Editrice university press, is the open access Journal of the Research Center CERI on "Prediction, Prevention ad Control of Geological Risks" of Sapienza University of Rome. The Journal publishes original papers concerning the numerous topics of environmental risks such as seismic risk, landslide risk, hydraulic and flood risk, groundwater resource management, soil and groundwater contamination, reclamation of contaminated land, applied geophysics, economic geology, land use, soil and rock characterization. IJEGE is the Journal of the Italian Association of Engineering Geology and Environment (AIGA). The Journal is published under the auspices of the International Association for Engineering Geology and the Environment (IAEG) - Italian Group.