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硅酸盐岩的风化产物通常可以有效地用于研究陆地表面发生的化学风化作用及其控制因素.选择位于东南亚热带地区的马来半岛和婆罗洲北部,通过分析其主要流域表层沉积物的黏土矿物和主要元素地球化学组成,开展热带地区化学风化及其控制因素的现代过程研究.结果显示,马来半岛的黏土矿物组合以高岭石(平均80%)为主,其次为伊利石(17%),基本不含绿泥石和蒙脱石;而婆罗洲北部则是以伊利石和绿泥石为主,两者之和在西北和东北婆罗洲平均分别为84%和87%,其次为高岭石(14%),不含蒙脱石.通过全岩和黏土粒级颗粒主要元素地球化学分析发现,这两个地区的化学风化作用都呈现强烈状态.相对而言,从东北婆罗洲、西北婆罗洲到马来半岛,化学风化强度依次持续加强,马来半岛已达到非常强烈的化学风化状态.研究认为,以马来半岛和婆罗洲为代表的东南亚热带地区,热带温暖如一的气温和东亚季风降雨等气候条件是控制化学风化作用的一级因素,形成遍布热带地区的强烈化学风化作用;构造活动和母岩性质是影响化学风化作用的次级因素,但仍然对风化产物的产生重要影响,形成马来半岛和婆罗洲完全不同的黏土矿物组合.
The weathering products of silicate rocks can usually be used effectively to study the chemical weathering and its controlling factors on the surface of the land.Selecting the clay in the sediments of the main river basins in the Malay Peninsula and northern Borneo in the tropical Southeast Asia, Mineralogy and major element geochemistry, the study on the modern process of chemical weathering and its controlling factors in the tropical region shows that the clay mineral assemblage in the Malay Peninsula is dominated by kaolinite (average 80%), followed by illite %), Basically free of chlorite and montmorillonite; while northern Borneo is based on illite and chlorite, the sum of the two in Northwest and Northeast Borneo average of 84% and 87%, followed by high The geochemical analysis of the major elements of the whole-grained and clay-type grain shows that the chemical weathering of these two areas is in a strong state.From the northeast Borneo, In the northwestern Borneo and the Malay Peninsula, the intensity of chemical weathering continued to increase in turn, and the Malay Peninsula has reached a very strong chemical weathering state. The study shows that the tropical Southeast Asia, represented by the Malay Peninsula and Borneo, Climatic conditions, such as warm temperate zone and East Asian monsoon rainfall, are the first-order factors controlling chemical weathering and form intense chemical weathering in tropical regions. The tectonic activities and parent rock properties are secondary factors affecting chemical weathering. However, It has a major impact on weathering products and forms a completely different clay mineral assemblage in the Malay Peninsula and Borneo.