Pedosphere 3(3): 247--252, 1993
ISSN 1002-0160/CN 32-1315/P
©1993 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Mineralogical Characteristics of Yellow- Red Soils Derived from Granite |
| LUO JIA-XIAN, YANG DE-YONG, JIANG MEI-YIN, BAO MEI-FEN, CHEN JIE |
| Institute of Soil Science, Academia Sinica, P. O, Box 821, Nanjing 210008 |
| ABSTRACT |
| Mineral constituents and their weathering in yellow-red soils derived from granite in middle and lower reaches of the Yangtze R iver were studied. Light minerals in fractions greater than silt contained over 80% quartz and feldspar, and heavy ones contained more than 60% various iron minerals and about 30% mica and hornblende. Kaolinite was the main clay mineral, the content of which was about 300 -400 g/kg. Quartz was weathered very weakly, Ca-feldspar was weathered over 65%, and about 25% of Na-feldspar was weathered. The vermiculitisation of mica was relativly obvious, > 50% of mica being weathered to vermiculite. Weatherable minerals were also obviously weathered, the weathering being about 60%. Soil vermiculite was evolved through the process of mica→hydromica→vermiculite-chlorite→vermiculite, which was closely related to leaching situation and oxidic condition. |
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| Citation: Luo, J. X., Yang, D. Y., Jiang, M. Y., Bao, M. F. and Chen, J. 1993. Mineralogical Characteristics of Yellow- Red Soils Derived from Granite. Pedosphere. 3(3): 247-252. |
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