Weathering mechanisms and indices of the igneous rocks of Hong Kong
文献类型：期刊论文
| 作者 | Ng, CWW; Guan, P; Shang, YJ |
| 刊名 | QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY
 |
| 出版日期 | 2001-05-01 |
| 卷号 | 34页码:133-151 |
| 关键词 | geochemistry geomaterials igneous rock laboratory tests weathering |
| ISSN号 | 0481-2085 |
| 文献子类 | Article |
| 英文摘要 | Weathering mechanisms of volcanic and granitic rocks in Hong Kong have been studied by chemical analysis, optical microscopy on thin sections and magnetic susceptibility measurements. The mobility of elements of calcium, sodium, iron, potassium, magnesium, silicon, aluminium and constitutional water is investigated in detail using the Mobility Index. Chemical weathering processes in Hong Kong are dominated by decomposition of feldspars and biotite, leaching of alkali and alkaline earth metals, and enrichment of ferric oxide under prolonged subtropical climate conditions. Data for some granitic residual soils from five neighbouring regions in Southern China are also gathered and examined. It is found that the residual soils in Hong Kong are abnormal and immature with respect to its latitude. By examining various quantitative chemical indices and comparing them with the current six-grade material classification scheme, WPI, LOI and I-mob are found to be good indicators of the degree of weathering for both volcanic and granitic rocks in Hong Kong. Regarding the optical microscopy, the micropetrographic index (I-p) is only suitable for granitic rock but not for Volcanic rock due to the presence of fine-grained minerals and small voids. For the magnetic susceptibility measurements, consistent results with weathering grades for volcanic rocks are obtained by applying a moving average technique. However, due to the low content of Al2O3 and Fe2O3 in granitic rock, SOC and the magnetic susceptibility index, which are appropriate for quantifying the degree of weathering of volcanic rock, are not quite suitable for the granitic rock. |
| WOS关键词 | GEOCHEMISTRY |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000168500800001 |
| 出版者 | GEOLOGICAL SOC PUBL HOUSE |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77095]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Ng, CWW |
| 作者单位 | 1.Hong Kong Univ Sci & Technol, Dept Civil Engn, Kowloon, Hong Kong, Peoples R China 2.Beijing Univ, Dept Geol, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Inst Geol, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ng, CWW,Guan, P,Shang, YJ. Weathering mechanisms and indices of the igneous rocks of Hong Kong[J]. QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY,2001,34:133-151. |
| APA | Ng, CWW,Guan, P,&Shang, YJ.(2001).Weathering mechanisms and indices of the igneous rocks of Hong Kong.QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY,34,133-151. |
| MLA | Ng, CWW,et al."Weathering mechanisms and indices of the igneous rocks of Hong Kong".QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY 34(2001):133-151. |
入库方式： OAI收割
来源：地质与地球物理研究所
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