北京密云湖表层沉积物中磁性矿物的鉴定

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS 地球物理学报 Pub Date : 2016-08-01 DOI:10.6038/cjg20160818
Han Fei, Wang Fuxian, Liao Jinhua, Qin Huafeng, Deng Chenglong, Pan Yongxin
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引用次数: 1

摘要

了解天然沉积物的磁性,包括磁性浓度、组成和粒度,是古地磁和古环境研究的基础。系统的磁性测量和非磁性方法(例如,透射电子显微镜,TEM)提供了磁性矿物的详细信息。本文建立了一种从密云湖表层沉积物中分离磁性矿物的高效磁选方法。我们分析了散装样品、磁性萃取物和残留物。磁性萃取物的饱和磁化强度(M-s)、体积磁化率(kappa)和饱和等温剩余磁化强度(SIRM)分别约为体样品的85%、75%和70%。多参数岩石磁性测量表明,沉积物中的磁性矿物主要为多域(MD)和单域(SD)磁铁矿。TEM分析显示碎屑为MD钛磁铁矿、生物SD磁铁矿(磁化石)和自生超顺磁磁铁矿。我们认为岩石磁学与透射电镜观测相结合有助于准确识别沉积物中的磁性矿物。
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Identification of magnetic minerals in surface sediments of Miyun Lake, Beijing
Understanding the magnetic properties of natural sediments, which include magnetic concentration, composition and grain size, is fundamental in paleomagnetic and paleoenvironmental studies. Systematic magnetic measurements and non-magnetic methods (e.g., transmission electron microscopy, TEM) provide detailed information of magnetic minerals. In this paper, we established a high efficient magnetic extraction method to separate magnetic minerals from surface sediments of Miyun lake in Beijing. We analyzed the bulk samples, magnetic extracts and residues. Saturation magnetization (M-s), volume magnetic susceptibility (kappa) and saturation isothermal remanent magnetization (SIRM) of the magnetic extracts is about 85%, 75% and 70% of the bulk samples, respectively. Multiple-parameter rock magnetic measurements indicated that the major magnetic minerals in sediments are multi-domain (MD) and single domain (SD) magnetite. TEM analyses revealed detrital MD titano-magnetite, biogenic SD magnetite (magnetofossils) and authigenic superparamagnetic (SP) magnetite. We propose that the combination of rock magnetism and TEM observations is useful to accurately identify the magnetic minerals in sediments.
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
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