| 宁武天池干海湖泊沉积物的部分非磁滞剩磁研究 |
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| 引用本文： | 张淑伟,刘青松,王喜生,CioppaMari,霍俊杰,吕义清,乔彦松,赵越. 宁武天池干海湖泊沉积物的部分非磁滞剩磁研究[J]. 地质力学学报, 2017, 23(4): 612-616 |
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| 作者姓名： | 张淑伟 刘青松 王喜生 CioppaMari 霍俊杰 吕义清 乔彦松 赵越 |
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| 作者单位： | 中国地质科学院地质力学研究所, 北京 100081;太原理工大学矿业工程学院, 山西 太原 030024,深圳南方科技大学海洋科学和工程学院, 广东 深圳 518055,中国地质科学院地质力学研究所, 北京 100081,Department of Earth and Environmental Sciences, University of Windsor, Windsor, ON N9B 3P4, Canada,太原理工大学矿业工程学院, 山西 太原 030024,太原理工大学矿业工程学院, 山西 太原 030024,中国地质科学院地质力学研究所, 北京 100081,中国地质科学院地质力学研究所, 北京 100081 |
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| 基金项目： | 国家自然科学基金青年基金项目（41204052）；国家博士后基金（2014M550780）；山西省自然基金（2014011032-2）；山西省回国留学人员基金（2014-021）。 |
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| 摘 要： | 应用部分非磁滞剩磁(pARM)谱,对山西宁武天池干海湖泊沉积物携带的磁信息研究表明,粗磁铁矿颗粒(MD)是主要载磁矿物颗粒,其pARM谱在低矫顽力区间(AF20 mT)达到最高值;而细磁铁矿颗粒(PSD-SD)为次要载磁颗粒,其pARM谱在高矫顽力区间(AF20 mT)稍有突起。但是,剖面三个层位具有不同特征,上层(大约7.3~4.0 ka)的粗磁性矿物颗粒含量最高,下层(大约12.0~13.0 ka)次之,而中层(大约12.0~7.3 ka)相对最低;中层的细磁性颗粒含量最高,下层和上层的细磁性颗粒含量次之。pARM谱分析结果与磁滞曲线测量获得的磁畴结果一致。在较高的交变磁场区间获得的pARM可以有效地压抑粗磁颗粒的信息,进而使细磁颗粒的信号增强。应用pARM谱分析,能有效判别样品中磁性矿物的磁畴状态,有助于沉积物的古气候、岩石磁学和古地磁学研究。
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| 关 键 词： | 部分非磁滞剩磁 磁颗粒 湖泊沉积物 宁武 岩石磁学 |
| 收稿时间： | 2017-02-06 |
A STUDY ON PARTIAL ANHYSTERETIC REMANENCE IN SEDIMENTS FROM GANHAI LAKE, NINGWU TIANCHI |
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| ZHANG Shuwei,LIU Qingsong,WANG Xisheng,Cioppa Mari,HUO Junjie,LV Yiqing,QIAO Yansong and ZHAO Yue. A STUDY ON PARTIAL ANHYSTERETIC REMANENCE IN SEDIMENTS FROM GANHAI LAKE, NINGWU TIANCHI[J]. Journal of Geomechanics, 2017, 23(4): 612-616 |
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| Authors: | ZHANG Shuwei LIU Qingsong WANG Xisheng Cioppa Mari HUO Junjie LV Yiqing QIAO Yansong ZHAO Yue |
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| Affiliation: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China,Department of Ocean Science and Engineering, South University of Science and Technology, Shenzhen 518055, Guangdong, China,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China,Department of Earth and Environmental Sciences, University of Windsor, Windsor, ON N9B 3P4, Canada,College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China,College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China,Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China and Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | A study of partial anhysteretic remanent magnetization (pARM) spectra in samples from a sediment profile of Ganhai Lake (38°53''N, 112°11''E) shows variations in effective magnetic grain sizes of the lake sediment magnetite particles, consistent with the hysteresis results. Within the full profile, most magnetite particles are of coarse, multi-domain (MD) size, as shown by the dominant low coercivity (AF<20 mT) spectra, with a few samples showing finer single domain (SD)-pseudo-single domain (PSD) particles with higher coercivity (AF>20 mT). The uppermost level (~7.3~4.0 ka) contains more coarse MD magnetite grains due to higher pARM peaks than the middle (~12.0~7.3 ka) and the lowermost level (~13.0~12.0 ka) that shows lower peaks. The middle level shows slight more fine SD-PSD magnetite grains than both the uppermost and lowermost level. High-field pARM spectrum can effectively identify fine PSD-SD magnetite grains and reduce effects of MD grains. Therefore, pARM spectrum analysis can be utilized to quickly and effectively determine the relative amount of fine magnetic grains in the samples, which is helpful to the study of the paleo-climate, rock magnetism and paleomagnetism of the lake sediments. |
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| Keywords: | pARM magnetic grains lake sediments Ningwu rock magnetism |
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