古地理学报 ›› 2015, Vol. 17 ›› Issue (5): 699-708. doi: 10.7605/gdlxb.2015.05.058

• 地球化学、沉积环境及古气候 • 上一篇    下一篇

赣北鄱阳湖地区土塘剖面第四纪红土地球化学特征及古气候意义

凌超豪1,2,龙进1,2,贾玉连1,2,洪祎君1,2,徐传奇1,2,王鹏岭3   

  1. 1 江西师范大学地理与环境学院,江西南昌 330022;
    2 鄱阳湖湿地与流域研究教育部重点实验室,江西南昌 330022;
    3 中国气象局气候研究开放实验室,国家气候中心,北京 100081
  • 收稿日期:2014-10-13 修回日期:2015-04-16 出版日期:2015-10-01 发布日期:2015-10-01
  • 作者简介:凌超豪,男,1989年7月生,湖南娄底人,江西师范大学地理与环境学院自然地理学硕士研究生,主要从事自然地理学和第四纪环境研究。E-mail: 304702807@qq.com。
  • 基金资助:
    国家自然科学基金项目(编号:41262007),江西省研究生创新基金项目(编号:YC2014-S155),江西省重大生态安全问题监控协同创新中心项目(编号:JXS-EW-00)和鄱阳湖湿地与流域研究教育部重点实验室主任开放基金项目(编号:ZK2013003)共同资助

Geochemical characteristics and palaeoclimate significanceof the Quaternary laterite of Tutan section in Poyang Lake region,northern Jiangxi Province

Ling Chaohao1,2, Long Jin1,2, Jia Yulian1,2, Hong Yijun1,2, Xu Chuanqi1,2, Wang Pengling3   

  1. 1 School of Geography and Environment,Jiangxi Normal University,Nanchang 330022,Jiangxi;
    2 Key Laboratory of Poyang Lake Wetland and Watershed Research,Ministry of Education,Nanchang 330022,Jiangxi;
    3 Laboratory for Climate Studies,China Meteorological Administration,Beijing 100081
  • Received:2014-10-13 Revised:2015-04-16 Online:2015-10-01 Published:2015-10-01
  • About author:Ling Chaohao,born in 1989,is a master candidate in the School of Geography and Environment of Jiangxi Normal University. He is mainly engaged in physical geography and Quaternary science. E-mail: 304702807@qq.com.

摘要: 赣北鄱阳湖地区土塘剖面发育第四纪红土,自下而上可分为强网纹红土层、弱网纹红土层、微网纹红土层、均质红土层和下蜀黄土层。基于常量元素、粒度分析数据以及前人年代框架,初探土塘剖面化学风化特征及其古气候意义。(1)土塘剖面粒度组分均一,常量元素含量相近,风化淋溶强烈。(2)土塘剖面各地层间化学风化强度存在差异:下蜀黄土层为初期的去Na、Ca阶段;均质红土层为中期的去K阶段;微网纹红土层由去K阶段向去Si阶段过渡;网纹红土层已完全进入晚期去Si阶段。剖面常量元素的相对迁移能力为:Na2O>MnO2>CaO>P2O5>MgO>K2O>SiO2>Al2O3>TiO2>Fe2O3。(3)中更新世以来赣北鄱阳湖地区气候总体上由暖湿趋于干冷,期间伴随多个明显的干湿旋回佐证强烈的淋溶与干湿交替作用是网纹红土发育的重要驱动因子。

关键词: 赣北, 鄱阳湖地区, 第四纪, 常量元素, 古气候演变

Abstract: The Quaternary laterite was developed in the Tutang section in Poyang Lake region,northern Jiangxi Province,and it was divided into four layers from bottom to top, including the highly developed vermicular laterite layer, the weakly developed vermicular laterite layer, the very weakly developed vermicular laterite layer, the homogenous laterite layer and the Xiashu loess layer. The geochemical characteristics and palaeoclimate of Tutang section was analyzed based on the major element,grain size and chronological data from former researchers,and the conclusions were drawn as follows: (1)All layers of Tutang section are quite coincident in particle size and geochemical characteristics, and they all experienced an intense chemical weathering process. (2)As for the degree of weathering,the Xiashu loess is in the primary stage by leaching Ca and Na;the homogenous laterite almost reaches the secondary stage by leaching K; the very weakly developed vermicular laterite almost finishes the secondary stage by leaching K,and begins to leach Si; the vermicular laterite has been in the late stage by leaching Si. In terms of migration ability,the major elements are ranked as follows: Na2O>MnO2>CaO>P2O5>MgO>K2O>SiO2>Al2O3>TiO2>Fe2O3. (3)The climate of the Poyang Lake region in northern Jiangxi Province since the Middle Pleistocene changed from warm-wet to cool-dry generally,and the alternate dry and wet fluctuations were oprious, which suggested that the strong eluviation and alternate dry and wet fluctuations are the important driving factors to form the vermicular laterite.

Key words: northern Jiangxi Province, Poyang Lake region, Quaternary, major element, palaeoclimatic evolution

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