赣北鄱阳湖地区黄土元素地球化学特征研究

• 作 者: 张智 贾玉连 彭学敏 凌光久 王鹏岭
• 机 构: 江西师范大学地理与环境学院,鄱阳湖湿地与流域研究教育部重点实验室,中国气象局气候研究开放实验室国家气候中心,
• 出 处: 长江流域资源与环境
• 发表日期: 2014年08期
• 关键词: 黄土 鄱阳湖地区 赣北 风成堆积 元素分析 化学风化特征 风化强度 赣北鄱阳湖地区 定山 风成沉积

对长江中下游彭泽定山—太平地区黄土进行元素分析,并将结果与黄土高原黄土、长江下游等地典型风成堆积进行对比。结果表明:(1)赣北鄱阳湖地区黄土元素P、Na、Ca亏损明显,Ti、Fe等为残留富集;断面上黄土脱Ca、Na过程明显,正朝着脱K去Si富Al趋势发展;元素变化率特征,赣北鄱阳湖地区黄土主要元素的迁移顺序如下:Ca>P>Na>Mg>Mn>K>Si>Al>Fe3+>Ti。(2)赣北鄱阳湖地区黄土风化强度属于中等风化强度,与其他地区风成沉积在风化强度由弱到强上构成如下序列:洛川黄土<镇江黄土<赣北鄱阳湖地区黄土<宣城风成红土。研究区黄土风化强度略强于镇江黄土,主要是由二者地形条件决定的排水条件造成。(3)研究区稳定元素组成明显区别于其他地区风成沉积,指示定山—太平地区沙山砂、黄土可能来自统一的物源区即其上风向的长江河漫滩平原。 The elemental analysis of the Loess Plateau in the area of ​​Pengzeding Mountain and Taiping in the middle and lower reaches of the Yangtze River is carried out. The results are compared with those of the typical loess deposits in the Loess Plateau and the lower reaches of the Yangtze River. The results show that: (1) P, Na and Ca in the Poyang Lake area of ​​North Jiangxi Province are obviously depleted and Ti, Fe and other elements are abundantly accumulated; In the Poyang Lake area of ​​Jiangxi, the migration order of major elements of loess is as follows: Ca> P> Na> Mg> Mn> K> Si> Al> Fe3 +> Ti. (2) The weathered intensity of loess in the Poyang Lake area of ​​northern Jiangxi is moderately weathered, and the aeolian deposits in the Poyang Lake area in the northern part of China constitute the following sequences from weaker to stronger: Luochuan loess