| 全风化花岗岩化学及矿物成份在全土和粘粒中的不同表征 |
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| 引用本文： | 尚彦军,岳中琦,王思敬,涂新斌.全风化花岗岩化学及矿物成份在全土和粘粒中的不同表征[J].地质科学,2005,40(1):95-104. |
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| 作者姓名： | 尚彦军 岳中琦 王思敬 涂新斌 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所工程地质力学重点实验室, 北京, 100029;2. 香港大学土木工程系, 香港 |
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| 基金项目： | 香港大学校科研和教改项目 |
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| 摘 要： | 对全风化花岗岩化学和矿物成份的测试常用全土和粘粒部分(粒径<2μm)分别进行。业已发现两者由于物质组成和结构特征的差异,对土工程地质性质所起作用不同。本文给出了6个全风化花岗岩样品的全土和粘粒部分筛分法和移液管法测定粒度成份,用X荧光光谱仪做全量化学分析,及XRD矿物学分析的结果。对比这两部分数据发现,属于含砾土的这些样品化学成份的变化同矿物一致,尤其是同粘土矿物成份含量变化很一致。同全岩相比,粘粒化学成份中的SiO2减少了近50%,K2O含量也降低,而Al2O3、Fe2O3和H2O+都明显升高。粘粒中氧化物相对含量升高者居多;全岩矿物成份以石英、粘土矿物和长石为主,粘粒中埃洛石和高岭石占大多数,其次为伊利石;粒度成份、化学成份和矿物含量相关性比较明显的是:石英和角砾正相关,和砂粒负相关,长石和砂粒正相关,粘土矿物含量和Al2O3、烧失量(LOI)和埃洛石含量正相关。
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| 关 键 词： | 全风化花岗岩 全土 粘粒 化学成份 粘土矿物 |
| 文章编号： | 0563-5020(2005)01-0095-10 |
| 收稿时间： | 2003-07-29 |
| 修稿时间： | 2003-07-29; |
DISTINCTIVE FEATURES OF CHEMICAL COMPONENTS AND MINERALS IN MASS AND CLAY PORTIONS OF COMPLETELY DECOMPOSED GRANITE |
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| Shang Yanjun,Yue Zhongqi,Wang Sijing,Tu Xinbin.DISTINCTIVE FEATURES OF CHEMICAL COMPONENTS AND MINERALS IN MASS AND CLAY PORTIONS OF COMPLETELY DECOMPOSED GRANITE[J].Chinese Journal of Geology,2005,40(1):95-104. |
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| Authors: | Shang Yanjun Yue Zhongqi Wang Sijing Tu Xinbin |
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| Institution: | 1. Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;2. Department of Civil Engineering, The University of Hong Kong, Hong Kong |
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| Abstract: | In chemical and mineral tests on the completely decomposed granite, the mass specimen and the clay portion(particle diameter<2 μm)were to be undertaken. It was well known that the two parts played different roles in soil engineering geological behaviors because of their distinctive material constituents and microstructures. The correlation of the two parts was seldom clarified in previous studies. With the purpose of identification of weathering grades in detail, comparison of mineral components, chemical constituents in the two parts and analysis of their relationships, tests on the mass and the clay portions of the 6 completely decomposed granites were carried out, which included sieve analysis and sampling pipette on the particle size distribution, X-ray fluorescence spectrum of sequence-type on chemical components, and X-ray diffraction on mineral constituents. By comparison, it was found that for these gravel-bearing soils, the content variation of chemical components was closely concordant with that of mineral proportions, especially those of clay minerals. When compared with those in the mass, it was disclosed that the content of SiO2 in clays decreased nearly 50%,K2O was also lessened,while the contents of Al2O3, Fe2O3 and H2O+ had an obvious increasing. For these chemical components, most of them increased. In mineral components, the quartz, clay minerals and feldspar account for the majority in the mass, and the halloysite and kaolinite were dominant in clays, the next being illite. Among the correlations of particle size, chemical contents and mineral proportions, the significant relations existed between quartz and gravel with positive relation, quartz and sands with negative relation, feldspar and sands with positive relation, clay minerals and Al2O3, loss of ignition(LOI)with positive relations, respectively. The halloysite in clays and clay minerals in the mass were positively related with each other. |
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| Keywords: | Completely decomposed granite The mass Clay portions Chemical components Clay minerals |
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