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德国Chiemsee湖磁性细菌干湖泥的磁学性质
  • ISSN号:1001-7410
  • 期刊名称:第四纪研究
  • 时间:2012
  • 页码:820-824
  • 分类:P318.41[天文地球—固体地球物理学;天文地球—地球物理学] P941.78[天文地球—自然地理学]
  • 作者机构:[1]兰州大学西部环境与气候变化研究院,西部环境教育部重点实验室,兰州730000, [2]福建师范大学全球变化研究中心,地理科学学院,福州350007, [3]DepartmentofEnvironmentandGeography,MaequarieUniversity,SydneyNSW2109,Australia;, [4]DepartmentofEarthandEnvironmentalSciences,Ludwig-Maximilians-University,Theresienstrasse41,D-80333,Munich,Germany
  • 相关基金:国家自然科学基金项目(批准号40830105,41072124和41021091)资助
  • 相关项目:甘肃新生代风积与湖积过渡地带地层特征及其变化研究
中文摘要:

对经历过实验室磁性细菌培养的Chiemsee湖的4块干湖泥样品进行了磁学参数、粒度和XRD测量,结果表明样品中的主要磁性矿物以磁铁矿为主,并含有少量的硫铁矿。培养深度1-2cm处的样品在磁化率、百分比频率磁化率、无磁滞剩磁、饱和磁化强度和矫顽力等磁学特征上表现出和其余样品差别较大,分析认为这种差异可能是由于该层位的样品受到较多的磁性细菌产生的磁小体影响所致。样品的低温饱和剩磁测量表明样品中除了单畴(SD)磁铁矿之外,还存在多畴(MD)磁铁矿颗粒,利用粒度频率分布曲线对沉积物的来源进行了分析,表明Chiemsee湖的沉积物可能主要是沉积在湖泊周围的一些风积物在地表水流作用下,与一些粗粒级沙粒一并进入湖泊所形成,样品中的粗粒多畴磁铁矿可能是这些沉积物所携带的,与后期的磁性细菌关系不大。因此,沉积物中的磁学信号除了磁性细菌产生的磁小体的贡献以外,其他物源沉积物的贡献显然也是不可忽略的重要因素。

英文摘要:

In this paper,we measured the magnetic parameters,grain size and XRD for four dry mud samples,which were taken from Lake Chiemsee, Bavaria of Germany. The Lake Chiemsee (47°54'N, 12°30'E ; 520m above sea level) located in the piedmont of Alps,covers about 80kin2. After collected by piston cores, the samples had experienced the magnetotactic bacteria culture in laboratory, then were air-dried and divided into four parts (various depths) which were named Bio-tesl, Bio-lcs2, Bio-lcs3, Bio-lcs4. The results of the experiments show that the main magnetic minerals in the samples are magnetite, and a few pyrite simultaneously exist. Compared with other samples, the sample cultured at 1 - 2cm depth displays some different properties in magnetic susceptibility (Z) , percentage frequency magnetic susceptibility ( Zfd% , anhysteretic remanent magnetization ( ARM ) , saturation magnetization (M) and eoercivity( H o) , likely indicating higher concentration of magnetosomes produced by more magnetotactie bacteria in such certain depth. The results of low-temperature saturation remanence show clear Verwey transition, suggesting presence of multi-domain (MD) magnetite in the samples. That coarse size is out range of reported magnetosomes. That was also detected by particle size measurements showing a few peaks for the distribution curves. Of which,two main peaks are all larger than that of single domain SD/MD boundary. That likely indicates that lake Chiemsee sediments may be a mixture sources, together with aeolian deposit down to the lake. Some coarser sands and aeolian deposit around the lake would be possibly washed down to the lake by surface water flow. The multi-domain magnetite measured in the samples could be within these coarser sediments.

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期刊信息
  • 《第四纪研究》
  • 中国科技核心期刊
  • 主管单位:中国科学院
  • 主办单位:中国科学院地质与地球物理研究所 中国第四纪研究委员会
  • 主编:郭正堂
  • 地址:北京9825信箱
  • 邮编:100029
  • 邮箱:dsj@mail.igcas.ac.cn dsjs@mail.igcas.ac.cn
  • 电话:010-82998119
  • 国际标准刊号:ISSN:1001-7410
  • 国内统一刊号:ISSN:11-2708/P
  • 邮发代号:82-428
  • 获奖情况:
  • 1996年被国务院学位委员会地球物理及地质学科评议...,2001年入中国期刊方阵,2007年获中国科学院出版基金科技期刊排行榜三等奖
  • 国内外数据库收录:
  • 美国化学文摘(网络版),英国动物学记录,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:17826