Analysis on the Magnetic Susceptibility and Its Influence Factors of theLake Sediments in the CH0310 Core of Qarhan Paleolake, Qaidam Basin

Key words: 
• magnetic susceptibility

Abstract: By analyzing lithology, magnetic features, the highfrequency and the lowfrequency quality magnetic susceptibility, frequency magnetic susceptibility and total organic matter (TOC) of the sediments of the 523m CH0310 core in Qarhan paleolake, Qaidam Basin, the conclusion shows that magnetite is the main contributor to the magnetic susceptibility in the CH0310 core. Due to the impact and control of the climate and environment, magnetic susceptibility is positively correlated with coarse sand content and negatively correlated with the clay content in sediments from the weak oxidation environmentdominated CH0310 core. Based on the further analysis on the relevance of magnetic susceptibility and TOC, the results present that the relevance of magnetic susceptibility and TOC in the different sediment layers show the positive and negative differences, reflecting the different corresponding model of magnetic susceptibility to climate and environment in CH0310 different layers, revealing the complexity of the factors as well as the uncertainty of the lake magnetic susceptibility as a proxy indicator of climate. Therefore, for the lake which is located in the plateau and arid area and has the rapid sedimentation rate and thicker sediment layers, special care should be taken if using magnetic susceptibility as a single indicator to reflect and reconstruct the paleoclimatic and paleoenvironmental changes.