古地理学报Issue(5)：699-708,10.DOI:10.7605/gdlxb.2015.05.058
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
Geochemical characteristics and palaeoclimate significance of the Quaternary laterite of Tutan section in Poyang Lake region, northern Jiangxi Province
摘要
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 de_veloped vermicular laterite layer,the weakly developed vermicular laterite layer,the very weakly devel_oped 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 lay_ers of Tutang section are quite coincident in particle size and geochemical characteristics,and they all ex_perienced 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 leac_hing 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:Na2 O>MnO2 >CaO>P 2 O5 >MgO>K2 O>SiO2>Al2 O3 >TiO2 >Fe 2 O3 .(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 fluctua_tions were oprious,which suggested that the strong eluviation and alternate dry and wet fluctuations are the important driving factors to form the vermicular laterite.关键词
赣北/鄱阳湖地区/第四纪/常量元素/古气候演变Key words
northern Jiangxi Province/Poyang Lake region/Quaternary/major element/palaeo_climatic evolution分类
天文与地球科学引用本文复制引用
凌超豪,龙进,贾玉连,洪君,徐传奇,王鹏岭..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[J].古地理学报,2015,(5):699-708,10.基金项目
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 （）
