Reconstructions of Paleowind Directions in the Pleistocene: Evidence from the Anisotropy of Magnetic Susceptibility of the Loess–Paleosol Series of Tajikistan and the Azov Region

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Izvestiya, Physics of the Solid Earth Pub Date : 2023-09-26 DOI:10.1134/S1069351323050063

O. A. Meshcheryakova, R. N. Kurbanov, V. E. Pavlov

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Abstract—The magnetic fabric of the reference Khonako-II (south Tajikistan), Beglitsa, and Chumbur-Kosa (Azov region) loess-paleosol sections was studied to reconstruct the paleowind directions during the Middle and Upper Pleistocene. The paleosols and loesses of the Khonako-II section represent a promising object for study of paleowinds. Our data indicate a prevailing ~ northwestward or ~northeastward wind directions during accumulation of the upper 40.8 m of the section. Thereby, a change from warm (pedocomplex 2) to cold (loess 2) epochs during the accumulation of the lower half of the studied sequence (end of the Middle Pleistocene) was accompanied by “switching” the predominant winds (from northwestern to northeastern ones), whereas accumulation of the upper part of the sequence was mainly controlled by winds of intermediate directions. The latter can be considered as evidence for the lesser contrast of wind rose during later epochs that were responsible for the formation of the upper part of the sequence. The study revealed that the magnetic fabric of loess and paleosol horizons of the Azov region sequences was deformed and cannot be used for paleowind reconstruction. It was demonstrated that sampling using plastic container technique widely applied in studying loess–paleosol deposits could led to the significant deformation of primary magnetic fabric.

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更新世古风向的重建——来自塔吉克斯坦和亚速尔地区黄土-古土壤系列磁化率各向异性的证据

摘要——研究了参考Khonako II（塔吉克斯坦南部）、Beglitsa和Chumbur Kosa（亚速尔地区）黄土古土壤剖面的磁性组构，以重建中更新世和上更新世的古风向。Khonako II剖面的古土壤和黄土是研究古风的一个很有前途的对象。我们的数据表明，在该路段上部40.8m的堆积过程中，盛行的风向为西北风或东北风。因此，在所研究序列的下半部分（中更新世末）的堆积过程中，从暖（土壤复合体2）到冷（黄土2）时期的变化伴随着主导风（从西北风到东北风）的“切换”，而序列上部的堆积主要受中向风的控制。后者可以被认为是后期风上升对比度较小的证据，这些对比度是形成层序上部的原因。研究表明，亚速海地区序列黄土和古土壤层的磁性组构发生了变形，不能用于古风的重建。研究表明，在黄土-古土壤沉积研究中广泛应用的塑性容器取样技术可以导致原生磁组构的显著变形。

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来源期刊

Izvestiya, Physics of the Solid Earth 地学-地球化学与地球物理

CiteScore

1.60

自引率

30.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.