| 庐山JL剖面红土磁化率特征及古环境记录 |
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| 引用本文： | 朱丽东,姜永见,张明强,叶玮,李凤全,冯义雄.庐山JL剖面红土磁化率特征及古环境记录[J].山地学报,2011,29(4). |
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| 作者姓名： | 朱丽东 姜永见 张明强 叶玮 李凤全 冯义雄 |
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| 作者单位： | 1. 浙江师范大学地理过程实验室,浙江金华,321004
2. 中国科学院南京地理与湖泊研究所,江苏南京,210008 |
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| 基金项目： | 国家自然科学基金项目(41071002); 浙江省自然科学基金项目(Y5080307)共同资助~~ |
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| 摘 要： | 江西九江庐山地区JL剖面红土磁化率测试结果表明:1.典型网纹红土的磁化率远小于弱网纹红土和棕黄色黄土-古土壤,数值上,棕黄色黄土-古土壤是网纹红土的2.33倍.剖面各层段频率磁化率均值变化于10.09％～ 13.71％,且与磁化率显著正相关,表明风化成土作用中形成的超顺磁性颗粒对红土磁性增强具有重要贡献.2.湿润气候和土壤渍水的假潜育环境下铁磁性矿物易于分解、转化、淋失,这可能是导致网纹红土磁化率异常偏小的主因.从而在剖面上磁化率与CIA变化趋势相反,两者峰谷波动又基本一致.3.结合ESR年代,JL红土磁化率沿剖面自下而上分为4个波动式增大的阶段,可与早更新世以来季风环流演变过程中的几个重要转折期对应,记录了大尺度内的古环境变化信息.早更新世以来该区环境湿润程度波动式减弱,气候自中更新世以来由湿热向干冷转变.
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| 关 键 词： | 第四纪 加积型红土 磁化率 古环境记录 |
Characteristics of Magnetic Susceptibility and Its Paleoenvironmental Records from JL Red Earth Section,Lushan Area |
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| ZHU Lidong
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JIANG Yongjian
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ZHANG Mingqiang
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YE Wei
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LI Fengquan
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FENG Yixiong.Characteristics of Magnetic Susceptibility and Its Paleoenvironmental Records from JL Red Earth Section,Lushan Area[J].Journal of Mountain Research,2011,29(4). |
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| Authors: | ZHU Lidong JIANG Yongjian ZHANG Mingqiang YE Wei LI Fengquan FENG Yixiong |
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| Institution: | ZHU Lidong1,JIANG Yongjian2,ZHANG Mingqiang1,YE Wei1,LI Fengquan1,FENG Yixiong1(1.Geography Process Lab,Zhejiang Normal University,Jinhua 321004,Zhejiang,China,2.Nanjing Institute of Geography & Limnology,Chinese Academy of Sciences,Nanjing 210008,Jiangsu,China) |
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| Abstract: | Magnetic susceptibility is one of the most remarkable indices in researches on Quaternary environment.920 samples were collected from JL red earth section,Lushan area,Jiangxi province,and susceptibility was measured on all these samples.The results indicate that:(1) The magnetic susceptibility of weak plinthitic red earth and loess-paleosol is rather higher than typical plinthitic red earth,loess-paleosol is 2.88 times the value of plinthitic red earth.The average values of frequency-dependent magnetic susc... |
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| Keywords: | Quaternary aggradation red earth magnetic susceptibility paleoenvironmental records |
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