Periodization of Holocene Climatic Cycles Based on Synchronous Variations in the Magnetic and Geochemical Parameters of the Sediments of Lake Bolshoe Yarovoe (Southwestern Siberia)

被引：1

作者：

Kosareva, L. R. ^{[1
]}

Shcherbakov, V. P. ^{[1
,2
]}

Nurgaliev, D. K. ^{[1
]}

Nurgalieva, N. G. ^{[1
]}

Sycheva, N. K. ^{[2
]}

Antonenko, V. V. ^{[1
]}

Kuzina, D. M. ^{[1
]}

Evtyugin, V. G. ^{[3
]}

机构：

[1] Kazan Volga Reg Fed Univ, Inst Geol & Petr Technol, Ul Kremlevskaya 4-5, Kazan 420111, Russia

[2] Russian Acad Sci, Schmidt Inst Phys Earth, Borok Geophys Observ, Borok 142, Yaroslavl Region 152742, Russia

[3] Kazan Volga Reg Fed Univ, Interdisciplinary Ctr Analyt Microscopy, Ul Parizhskoi Kommuny 9, Kazan 420111, Russia

来源：

RUSSIAN GEOLOGY AND GEOPHYSICS | 2020年 / 61卷 / 07期

基金：

俄罗斯科学基金会;

关键词：

lacustrine sediments; Holocene climate; magnetic properties; ferrimagnetic components; magnetotactic bacteria; coercive spectra; REMANENCE CURVES; ENVIRONMENTAL HISTORY; COMPONENTS; POLLEN; VEGETATION; XINJIANG; BIOMES;

D O I：

10.15372/RGG2019148

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Variations in the magnetic and geochemical properties of the sediments of Lake Bolshoe Yarovoe (Altai Territory) were studied. The data were derived from five core columns (up to 4.5 m long) covering a time interval of more than 8000 years. In addition, coercive spectra were obtained for 792 samples taken every 2 cm. Coercive spectra were then used to identify soft magnetic (10-15 mT) and hard magnetic (35-50 mT) components. The soft magnetic component is detrital, and the hard magnetic component is biogenic, which is confirmed by microscopic studies. Moreover, the samples contain micrometeorite particles. Variations in geochemical properties allow reconstruction of the environmental history of the lake. Sediments in the lower part of the section vary both in the content of ferrimagnetic components and in geochemical properties, which indicates a sharp environmental change between similar to 6100 and similar to 7600 years ago. Quasiperiodic alternation of warn (dry) and cool (humid) periods is observed higher in the section, between similar to 4100 and similar to 6100 years ago. The variations in the magnetic components are consistent with the environmental changes and can be used for the historical reconstruction.

引用

页码：723 / 737

页数：15

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