Are South China granites special in forming ion-adsorption REE deposits?
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From the view of energy state of material, this paper introduces a concept of weathering potential in carrying out quantitative calculation of the relevant products at different stages of rock-weathering and primary soil-forming processes, elaborates respectively on weathering degree in the bio-weathering layer of rocks and during the formation of soil material and clay, and evaluats the further tendency of weathering in the above-mentioned stages. The authors have discovered that the scales of weathering potential of the materials increase successively in the three stages, which indicates that the products in the above-mentioned three stages must have undergone stronger and stronger weathering in the primitive forming process of soil in Fildes Peninsula, Antarctic. But, because of relatively weak chemical weathering, it is reasonable that there are much more skeleton grains and little clay in primary soils in this region. Meanwhile, the authors have also verified that the weathering potential of crude rock determines to some extent decrease in the products' weathering potential in the different stages in primary soil-forming, thereby plays an important role in the genesis and development of the primary soil in the studied area.
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Many researchers have studied rates of weathering layer development. Weathering layers broadly include weathering rinds, hydration layers, rock varnish, and weathering crusts, each of which has been discussed within individual research fields. To understand the development of these weathering layers, previous research on the growth rates of weathering layer thickness and formation processes is reviewed. Then, terminology relating to weathering layers is elucidated. Weathering rind development is affected by the porosity and mobility of many elements. Conversely, the obsidian hydration layer is mainly controlled by moisture content and rock varnish is influenced by microbial activities. Environmental differences in the thickness of these thin weathered or alteration layers with weathering time are also examined. Although data are limited, the growth of weathering rind thickness varies by rock types and environmental conditions. The next stage of weathering rind studies will be supported by the progress of analytical methods including isotopic elements, interpretation of rock properties, biomineralization, and introduction of environmental parameters.
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From the view of energy state of material,this paper introduces a concept a concept of weathering potential in carrying out quantitative calculation of the relevant products at different stages of rock-weathering and primary soil-forming processes,elaborates respectively on weathering degree in the bio-weathering layer of rocks and during the formation of soil material and clay,and evaluats the further tendency of weathering in the above-mentioned stages.The authors have discovered that the scales of weathering potential of the materials increase successively in the three stages,which indicates that the products in the above-mentioned three stages must have undergone stronger and stronger weathering in the primitive forming process of soil in Fildes Peninsula,Antarctic.But,Because of relatively weak chemical weathering,it is reasonable that there are much more skeleton grains and little clay in priamry soils in this region.Meanwhile the authors have also verified that the weathering potential of crde rock determines to some extent decrease in the products' weathering potential in the different stages in primary soil-forming,thereby plays an important role in the genesis and development of the primary soil in the studied area.
Soil production function
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Kola peninsula
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