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引用本文:胡守云,吉磊,王苏民,朱育新.呼伦湖地区扎赉诺尔晚第四纪湖泊沉积物的磁化率变化及其影响因素.湖泊科学,1995,7(1):33-40. DOI:10.18307/1995.0105
Hu Shouyun,Ji Lei,Wang Sumin,Zhu Yuxin.Magnetic susceptibility of the late quaternary lacustrine sediments and its influence factors in Jula Nur, Hulun Lake area. J. Lake Sci.1995,7(1):33-40. DOI:10.18307/1995.0105
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呼伦湖地区扎赉诺尔晚第四纪湖泊沉积物的磁化率变化及其影响因素
胡守云, 吉磊, 王苏民, 朱育新
中国科学院南京地理与湖泊研究所湖泊沉积与环境开放研究实验室, 南京 210008
摘要:
呼伦湖盆地扎赉诺尔晚第四纪湖泊沉积物为砂、泥质碎屑沉积。对东露天矿剖面沉积物样品进行了低、高频磁化率测量、粒度分析、磁性矿物成分鉴定和Al2O3、Fe2O3含量分析。分析表明:磁铁矿是沉积物磁化率的主要贡献者,全铁含量控制了磁化率值的变化;磁化率与沉积物粒度呈负相关。进一步讨论认为,磁性矿物主要为粉砂-粘土级碎屑,集中分布在细粒沉积物中,因此造成其磁化率较高。砂质沉积物中频率磁化率较高,其原因可能是其中的磁性颗粒比粉砂-粘土级沉积物中的磁性颗粒更细一些。
关键词:  呼伦湖  湖泊沉积物  磁化率  磁性矿物
DOI:10.18307/1995.0105
分类号:
基金项目:国家自然科学基金项目(49172119);中国科学院南京地理与湖泊研究所所长择优支持基金课题(920219)
Magnetic susceptibility of the late quaternary lacustrine sediments and its influence factors in Jula Nur, Hulun Lake area
Hu Shouyun, Ji Lei, Wang Sumin, Zhu Yuxin
Lake Sediment and Environment Laboratory, Nanjing Institute of Geography and Limnology, Chinecse Academy of Sciences, Nanjing 210008
Abstract:
The late Quaternary lacustrine sediments in Jula Nur of Hulun Lake basin consist of sandy and muddy clastic deposits. The low and high frequence magnetic susceptibility of the samples from of East Open Cut Mine section has been measured. Also, grainsize, magnetic minerals and contents of Fe2O3, Al2O3 of the samples have been analysed. The results indicate that magntite is the main contributor of magnetic susceptibility of sediments, and the total Fe content controls the changes of the magnetic susceptibility which correlates negatively with the grainsize of the sediments. Further study shows that the magnetic minerals are mainly silt-clay clastic deposits, resulting in higher magnetic susceptibility. The frequence-dependent susceptibility of sandy deposits is very high, due to finer magnetic grain than those in silt-clay clastic deposits.
Key words:  Magnetic susceptibility  magnetic mineral  lacustrine sediment  Huiun Lake
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