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柴达木盆地察尔汗盐湖CH0310钻孔沉积物磁化率及其影响因素分析

期刊名称：沉积学报
时间：0
页码：790-797
语言：中文
分类：P534.63[天文地球—第四纪地质学;天文地球—古生物学与地层学;天文地球—地质学]
作者机构：[1]兰州大学资源与环境学院西部环境教育部重点实验室,兰州730000, [2]宝鸡文理学院,陕西宝鸡721007, [3]青海省地质调查院,西宁810012
相关基金：国家自然科学基金项目（批准号：40871057）; 创新群体项目（40721061）联合资助致谢于永涛、范喆、宿星、鲁振宇参与了野外打钻采样工作,田庆春、石培宏、祝和勇、闫晶参与了实验工作,在此一并致谢!
相关项目：西伯利亚南部黄土古土壤记录的第四纪气候变化研究

关键词：磁化率, TOC, 岩性, 沉积环境, 察尔汗盐湖, magnetic susceptibility, TOC, lithology, depositional environment, Qarhan paleolake

中文摘要：

通过对长为523 m的柴达木盆地察尔汗盐湖CH0310钻孔沉积物岩性、磁性特征、高频质量磁化率、低频质量磁化率、频率磁化率和总有机碳（TOC）的实验分析,结果表明：CH0310钻孔中磁铁矿是沉积物磁化率的主要贡献者;由于受气候和环境的影响与控制,以弱氧化环境为主CH0310钻孔中沉积物的磁化率与粗砂粒级含量成正相关与粘土级含量反相关关系;进一步对磁化率和TOC的相关性分析发现,在不同的沉积层磁化率和TOC的相关性表现出正负差异,这反映了磁化率对气候与环境的响应模式在CH0310钻孔不同层位并不完全相同,揭示出湖泊磁化率影响因素的复杂性和它作为气候代用指标的不确定性,因此认为对于地处高原干旱区沉积速率快、沉积层特别厚的湖泊来说,如果用单一的磁化率指标来反映或恢复古气候和古环境的变化需要特别慎重。

英文摘要：

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.