| Autor: |
MILNES, A. R., FARMER, V. C. |
| Zdroj: |
Journal of Soil Science; 1987, Vol. 38 Issue 4, p593-605, 13p |
| Abstrakt: |
SUMMARY Detailed micromorphological observations and associated electron probe microanalyses are used to examine the proposition that kaolinite and gibbsite in the B horizon of a humus iron podzol could arise by transformation of allophanic deposits. The B horizon of this podzol is highly complex. In the upper B horizon, this complexity is due to alternating episodes of the influx of organic matter and the deposition of allophanic material; evidence for the separate deposition of allophane and organic matter is presented. Material within the B horizon that has gibbsiporphyric fabric appears to have arisen by crystallization of gibbsite from aluminium-rich gels deposited before the main influx of allophanic material; there is no convincing evidence that allophanic material has transformed to kaolinite or gibbsite. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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