Pedosphere 2(2): 135--145, 1992
ISSN 1002-0160/CN 32-1315/P
©1992 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Mineral Composition and Weathering of Soils Derived from Xiashu Loess |
| DENG YOU-JUN, MA YI-JIE, YANG DE-YONG |
| Institute of Soil Science, Academia Sinica, P. O. Box 821. Nanjing 210008 |
| ABSTRACT |
| Mineralogical, physical and chemical analyses of the soils derived from Xiashu loess were carried out. The primary minerals of these soils were found to be mainly composed of light minerals, such as quartz, feldspar and mica, with traces of heavy minerals. Clay minerals, more complicate in composition, were dominated by hydromica, accompanied by smectite, vermiculite, chlorite, kaolinite, 2:1/1:1 randomly interstratified minerals and small amounts of quartz, goethite, lepidocrocite and hematite, Clay minerals were characterized by low crystallinity and fine particle size. In light of the quartz/feldspars ratio of the 0.01-0.05mm silt fraction, and the clay mineral composition, the freeness of iron oxide, and the silica/sesquioxide and silica/alumina ratios in < 0.002mm clay fraction, it is concluded that the weathering intensity of these soils was lower than those of red soil and yellow earth, but higher than that of brown earth, and that the soil allitization, depotassication and hydroxylation of cl |
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| Citation: Deng, Y. J., Ma, Y. J. and Yang, D. Y. 1992. Mineral Composition and Weathering of Soils Derived from Xiashu Loess. Pedosphere. 2(2): 135-145. |
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