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| 华南沿海地表红土地球化学特性变异的自然因素与人类活动干预 | |
| 引用本文： | 朱照宇,谢久兵,王彦华,谢先德,黄宁生.华南沿海地表红土地球化学特性变异的自然因素与人类活动干预[J].第四纪研究,2004,24(4):402-408. |
| 作者姓名： | 朱照宇 谢久兵 王彦华 谢先德 黄宁生 |
| 作者单位： | 中国科学院广州地球化学研究所与南海海洋研究所边缘海地质重点实验室,广州,510640;中国科学院地球环境研究所黄土与,第四纪地质国家重点实验室,西安,710075;中国科学院广州地球化学研究所与南海海洋研究所边缘海地质重点实验室,广州,510640;广东省科学院,广州,510170 |
| 基金项目： | 国家自然科学基金重点项目 (批准号 :40 3 3 10 0 9)，国家重大基础研究前期研究专项项目 (批准号 :2 0 0 3CCA0 0 10 0 )，中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金项目 (批准号 :SKLLQG0 10 8)，广东省科技攻关项目 (批准号 :960 90 0 )资 |
| 摘 要： | 文章对珠江三角洲和粤西地区地表表层红土的地球化学指标和矿物学指标进行了研究。研究结果表明,全岩的化学蚀变指数(CIA)值主要代表自然作用下化学风化的强度;而硅铝率(或Al2O3SiO2比值)和(高岭石+伊利石)石英比值在全岩研究中代表化学风化与侵蚀作用的共同强度;Al2O3SiO2比值与CIA值的相关关系可以作为区分化学风化作用自然因素变化与侵蚀作用加剧的一种新的分析方法:当样品CIA值异常偏离趋势线时,反映出自然化学风化作用的异常变化,而Al2O3SiO2比值的异常偏离则可能反映了表层侵蚀作用的加剧;结合当地自然环境和人类活动的特点,可以推断人为因素对表层红土剖面地球化学特征变异的干预和对侵蚀作用加剧的贡献 |
| 关 键 词： | 红土 地球化学特征变异 自然因素 侵蚀作用 人类干预 华南沿海 |
| 文章编号： | 1001-7410(2004)04-402-07 |
| 收稿时间： | 2004-04-05 |
| 修稿时间： | 2004年4月5日 |
THE NATURAL FACTORS AND ARTIFICIAL DISTURBANCE OF VARIATION IN GEOCHEMISTRY CHARACTERISTICS OF RED SOIL ON LAND SURFACE ALONG THE COAST OF SOUTH CHINA |
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| Institution: | 1. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry and South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510640; 2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi′an 710075; 3. Guangdong Academy of Sciences, Guangzhou 510170 |
| Abstract: | Based on the geochemical and mineral analysis several red soils developed on granite and basalt were investigated. The studied profiles scattered at the coastal region of South China, mainly at the Pearl River Delta and at West Guangdong. The results indicated that the Chemical Index of Alteration (CIA) can be used as an indicator of chemical weathering intensity. The ratios of Al 2O 3/SiO 2 and kaolinite illite vs quartz for whole rock indicated the intensities of both chemical weathering and erosion. The relationship between Al 2O 3/SiO 2 and CIA can be used to differentiate changes caused by natural chemical weathering and by erosion. When the CIA has a big warp it may indicate the abnormity change in weathering factors, when the Al 2O 3/SiO 2 has a remarkable warp it can be considered the increase of erosion intensity that may symbolize the increase of artificial disturbance. The results imply the fact that the natural process plays a major role in variation in geochemical characteristics of red soils, the disturbance of human activity is becoming more and more severe. The human activity, in fact, has affected the ecological environment and natural characteristics of the red soils and changed in some degrees the local climate condition. |
| Keywords: | red soil variation in geochemical characteristics natural process erosion human disturbance coastal region of South China |
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