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物探与化探  2019, Vol. 43 Issue (4): 912-918    DOI: 10.11720/wtyht.2019.1454
     生态环境调查 本期目录 | 过刊浏览 | 高级检索 |
湘赣丘陵区红土剖面磁化率分布特征及其环境记录
熊平生1,2, 刘书荣1(), 郭杨洋2
1. 衡阳师范学院 南岳学院,湖南 衡阳 421008
2. 衡阳师范学院 城市与旅游学院,湖南 衡阳 421002
Magnetic susceptibility distribution characteristics and environmental records along red clay section in Hunan-Jiangxi hilly area
Ping-Sheng XIONG1,2, Shu-Rong LIU1(), Yang-Yang GUO2
1. Nanyue College of Hengyang Normal University, Hunan 421008,China
2. College of City and Tourism of Hengyang Normal University,Hengyang 421002,China
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摘要 

南方红土是记录古环境信息的良好载体。为了揭示南方红土剖面磁化率的古环境意义及其与化学蚀变指数之间的关系,采集了湘赣地区黄金(HJ)、沙河(SH)、田村(TC)、高兴(GX)和松木(SM)5个红土剖面共计263个样品,同时进行低频磁化率和化学元素测量和分析。研究结果显示:① 赣南地区均质红土层、红壤层低频磁化率均值小于网纹红土层,红土剖面的低频磁化率均值分布范围介于(12.1~463.91)×10 -8 m 3/kg之间。② 衡阳地区红土低频磁化率与对应化学蚀变指数(CIA)值相关性较好,即为磁化率高值区指示暖湿沉积环境,磁化率低值区指示暖干沉积环境。③ 低频磁化率曲线波动频度和幅度存在区域性差异,但从剖面底部往上一致呈现为递减的变化趋势,揭示了湘赣地区红土沉积环境整体上由暖湿向温干方向演变。

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熊平生
刘书荣
郭杨洋
关键词 湘赣地区红土剖面低频磁化率化学蚀变指数    
Abstract

The red earth in southern China has been generally considered potential paleoenvironmental record. In order to reveal the paleoenvironmental implications of the red clay profile in southern China and its relationship with chemical index of alteration (CIA), the authors measured magnetic susceptibility and chemical elements of two hundred and sixty-three samples collected from Huangjin (HJ) ,Shahe (SH), Tiancun (TC), Gaoxing (GX), Songmu (SM) in Xianggan area. Some conclusions have been reached: (1) The average magnetic susceptibility of the vermiculated red clay layer is higher than that of homogeneous red clay layer and red soil layer in Gannan region. The low frequency magnetic rate of granite clay in Gannan region is higher than that of granite clay in Hengyang region. The distribution ranges of the low frequency magnetic susceptibility of red clay sections vary from 12.1×10 -8 m 3/kg to 463.91×10 -8 m 3/kg;(2)There is still preferable relationship between the low frequency magnetic susceptibility and chemical index of alteration (CIA) in Hengyang region. The high magnetic susceptibility values correspond to the high CIA values, indicating a warm and humid envirenment; the low magnetic susceptibility values correspond to the low CIA values, indicating a cold and dry envirenment.(3)The low-frequency magnetic susceptibility curves are regionally different in frequency and amplitude, the low frequency magnetic susceptibility of the red clay section shows a consistent downward trend, which reveals the change trend of palaeoclimate from warm-wet to warm-dry during the red clay deposition period.

Key wordsXianggan area    red earth section    low frequency magnetic susceptibility    chemical index of alteration(CIA)
收稿日期: 2018-12-18      出版日期: 2019-08-15
:  P631  
基金资助:衡阳市社会科学基金项目(2018D008);湖南省大学生研究性学习和创新性实验计划项目(NYD201704);国家自然科学基金项目(41471153)
通讯作者: 刘书荣
作者简介: 熊平生(1972-),男,博士,副教授,研究方向为地质学。Email: xps19721010@163.com
引用本文:   
熊平生, 刘书荣, 郭杨洋. 湘赣丘陵区红土剖面磁化率分布特征及其环境记录[J]. 物探与化探, 2019, 43(4): 912-918.
Ping-Sheng XIONG, Shu-Rong LIU, Yang-Yang GUO. Magnetic susceptibility distribution characteristics and environmental records along red clay section in Hunan-Jiangxi hilly area. Geophysical and Geochemical Exploration, 2019, 43(4): 912-918.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.1454      或      https://www.wutanyuhuatan.com/CN/Y2019/V43/I4/912
Fig.1  赣南地区地质概况
Fig.2  衡阳地区地质概况
Fig.3  赣南地区红土剖面磁化率含量垂向变化曲线
a—黄金剖面;b—沙河剖面;c—田村剖面
Fig.4  衡阳地区红土剖面磁化率含量垂向变化曲线
a—高兴剖面;b—松木剖面
Fig.5  衡阳地区红土剖面CIA值和磁化率值的相关性
a—高兴剖面;b—松木剖面
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