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长江口外CX21柱样的磁性特征及其影响因素

马鸿磊 张卫国 胡忠行 贾铁飞 董辰寅 刘莹

马鸿磊, 张卫国, 胡忠行, 贾铁飞, 董辰寅, 刘莹, . 长江口外CX21柱样的磁性特征及其影响因素[J]. 华东师范大学学报(自然科学版), 2012, (3): 120-129,153.
引用本文: 马鸿磊, 张卫国, 胡忠行, 贾铁飞, 董辰寅, 刘莹, . 长江口外CX21柱样的磁性特征及其影响因素[J]. 华东师范大学学报(自然科学版), 2012, (3): 120-129,153.
MA Hong-lei, ZHANG Wei-guo, HU Zhong-xing, JIA Tie-fei, DONG Chen-yin, LIU Ying, . Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors[J]. Journal of East China Normal University (Natural Sciences), 2012, (3): 120-129,153.
Citation: MA Hong-lei, ZHANG Wei-guo, HU Zhong-xing, JIA Tie-fei, DONG Chen-yin, LIU Ying, . Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors[J]. Journal of East China Normal University (Natural Sciences), 2012, (3): 120-129,153.

长江口外CX21柱样的磁性特征及其影响因素

详细信息
  • 中图分类号: P9

Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors

  • 摘要: 以长江口外、长340 cm的CX21柱样为对象,在磁性特征、地球化学和粒度分析的基础上,结合前期对Y7柱样的研究,探讨粒度、早期成岩作用和物源变化对沉积物磁性特征的影响.研究结果表明,该柱样磁性特征和粒度垂向变化显著.磁性参数、SIRM、fd和fd%与 2~4 m、4~8 m粒级含量呈相对较弱的正相关, 而ARM、ARM/SIRM和ARM/与16 m以下的各细颗粒组分有较强的正相关,表明CX21柱样沉积物磁性特征受到粒度变化的影响.利用BCR方法进行的铁的形态分析结果表明,CX21柱样170 cm深度以下具有较强的还原环境,磁性矿物受到较强的早期成岩作用影响.氧化还原不敏感元素Ti的垂向变化指示了物源变化,Ti向表层的增加与和SIRM向表层的增强具有同步性,说明物源变化也是CX21沉积物磁性特征影响的重要因素.尽管粒度组成和沉积速率不同,CX21与Y7柱样的磁性特征在垂向上具有相似性,表明磁性特征可作为长江口外沉积物地层对比的工具之一.
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出版历程
  • 收稿日期:  2011-02-01
  • 修回日期:  2011-05-01
  • 刊出日期:  2012-05-25

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