罗布泊盐湖沉积物磁性特征及其环境意义

doi:10.13866/j.azr.2021.01.27

Abstract

Abstract:

This article presents the particle size, total organic matter, rock magnetic, and x-ray diffraction analyses of saline lake sediments, aeolian sands, Tramarix cone, and yardangs sediments distributed along the west bank of Lop Nur. The aim was to investigate the vertical variations and influencing factors of magnetic characteristics, as well as the paleoenvironmental implications. Based on the magnetic properties, Lop Nur sediments can be divided into two types. In oxidizing environments, sediment magnetic properties are dominated by magnetite, which is consistent with the source materials (Tarim Basin) and are unaffected by early diagenesis. In reducing environments, sediment magnetic properties are dominated by authigenic iron sulfide (greigite and pyrite), which formed in the early diagenesis process. Layers that are dominated by greigite or pyrite have markedly higher or lower χ, SIRM, χ_ARM, and χ_ARM/χ and S_{-300 mT}, respectively, reflect the significant impact of early diagenesis on magnetic properties in the Lop Nur. Combined with the results of chronology from a previous study, we determined that the iron sulfide-bearing sediments were deposited during cold and wet periods, which were probably caused by the North Atlantic cold events that occurred throughout the past 3400 yr. During these periods, iron sulfide formation was likely driven by an enhanced organic matter supply. The magnetic parameters of Lop Nur sediments can be regarded as an indicator of the hydrological and climatic evolution of the Tarim Basin.

Key words: magnetic properties, early diagenesis, saline lake, climate change, Lop Nur

LI Wen,MU Guijin,LIN Yongchong,ZHANG Huijuan,WU Wangyang. Magnetic properties of Lop Nur saline sediments and the environmental implications[J].Arid Zone Research, 2021, 38(1): 257-266.

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Magnetic properties of Lop Nur saline sediments and the environmental implications

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