| 东菲律宾海柱样沉积物的磁性特征 |
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| 引用本文： | 孟庆勇,李安春,靳宁,徐兆凯,刘建国.东菲律宾海柱样沉积物的磁性特征[J].海洋地质与第四纪地质,2006,26(3):57-63. |
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| 作者姓名： | 孟庆勇 李安春 靳宁 徐兆凯 刘建国 |
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| 作者单位： | 1. 中国科学院,海洋研究所,青岛,266071;中国科学院,研究生院,北京,100039
2. 中国科学院,海洋研究所,青岛,266071 |
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| 基金项目： | 国家自然科学基金项目(40576032) |
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| 摘 要： | 对东菲律宾海帕里西维拉海盆西侧F090102柱样进行了系统的古地磁和岩石磁学研究,测量了天然剩磁倾角、磁化率、饱和等温剩磁、非磁滞剩磁、-T曲线等磁学参数,进行了磁性地层的划分对比,识别出松山反极性时内的贾拉米洛和奥都维正极性亚时。对磁学参数及其有关比值的研究发现,岩心磁性矿物以低矫顽力磁铁矿为主,可能含有一定的钛磁铁矿。磁性矿物主要是陆源碎屑成因,岩心底段受到海底火山作用的影响。根据磁学参数随深度的变化将岩心分为3段,各段反映了沉积环境和古气候的变化。
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| 关 键 词： | 柱样沉积物 磁性特征 东菲律宾海 |
| 文章编号： | 0256-1492(2006)03-0057-07 |
| 修稿时间： | 2005年12月23 |
MAGNETOSTRATIGRAPHIC AND MAGNETIC PROPERTIES OF MARINE SEDIMENTS FROM THE EAST PHILIPPINE SEA |
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| MENG Qing-yong,LI An-chun,JIN Ning,XU Zhao-kai,LIU Jian-guo.MAGNETOSTRATIGRAPHIC AND MAGNETIC PROPERTIES OF MARINE SEDIMENTS FROM THE EAST PHILIPPINE SEA[J].Marine Geology & Quaternary Geology,2006,26(3):57-63. |
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| Authors: | MENG Qing-yong LI An-chun JIN Ning XU Zhao-kai LIU Jian-guo |
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| Abstract: | A detailed magnetic analysis has been done on core F090102 from the East Philippine Sea,and the following magnetic parameters were measured: susceptibility(X_1),anhysteretic remnant magnetization(ARM),saturation isothermal remnant magnetization(SIRM),IRM_-300 mT(induced in a field of-300mT)and typical temperature dependence of magnetic susceptibility curves(X_1-T).Analyses of magnetic parameters demonstrated that magnetic minerals in the sequence are dominated by low-coercivity ferromagnetic minerals with subordinate high-coercivity antiferromagnetic minerals and are characterized by magnetite(probably including some titanomagnetites).The results show that the rock-magnetic parameters well correspond to the paleoclimatic variations and sedimentary environmental changes.And a magnetostratigraphic record was obtained.The Bruhnes-Matuyama reversal,the Jaramillo event as well as the Olduvai event during the Matuyama period were identified. |
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| Keywords: | core sediments magnetic properties East Philippine Sea |
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