Hostname: page-component-7479d7b7d-c9gpj Total loading time: 0 Render date: 2024-07-11T10:29:03.739Z Has data issue: false hasContentIssue false
  • English
  • Français

Quartz Presence in Relationship to Gibbsite Stability in Some Highly Weathered Soils of Brazil

Published online by Cambridge University Press:  01 July 2024

R. M. Weaver
R. M. Weaver*
Affiliation:
Department of Agronomy, Cornell University, Ithaca, NY 14853, U.S.A.
Get access Rights & Permissions [Opens in a new window]

Abstract

Determination of the mineralogical composition of six highly weathered soils of the Central Plateau of Brazil showed that the sand content (predominantly quartz) was not related to the relative amounts of gibbsite and kaolinite in the clay (< µm) fractions. The latter is in agreement with kinetic considerations of the involved mineral species, but in disagreement with thermodynamic considerations. However, that dissolution of quartz has been operative in these soils is indicated by an excellent relationship (r2 = 0·96) between the amount of sand-size quartz and the reactive SiO2 content of the clay fractions.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 6 , December 1975 , pp. 431 - 436
Copyright
Copyright © 1975, The Clay Minerals Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

Agronomy Paper No. 1130. Contribution from the Department of Agronomy, New York State College of Agriculture and Life Sciences, Cornell University

References

Anderson, J. U., (1963) An improved pretreatment for mineralogical analysis of samples containing organic matter Clays and Clay Minerals 10 380–388.Google Scholar
Hingston, F. J. and Raupach, M., (1967) The reaction between monosilicic acid and aluminum hydroxide—I: Kinetics of adsorption of monosilicic acid by aluminum hydroxide Austr. J. Soil Res. 5 295–309.CrossRefGoogle Scholar
Jackson, M. L., (1969) Soil Chemical Analysis—Advanced Course 2nd Edition Madison Published by the author, Dept. of Soil Science, Univ. of Wisconsin.Google Scholar
Kittrick, J. A., (1969) Soil minerals in the Al2O3-SiO2-H2O system and a theory of their formation Clays and Clay Minerals 17 157–167.CrossRefGoogle Scholar
LeRoux, J., (1973) Quantitative clay mineralogical analysis of Natal Oxisols Soil Sci. 115 137–144.Google Scholar
Lodding, W., (1972) Conditions for direct formation of gibbsite from K-feldspar—discussion Am. Miner. 57 292–294.Google Scholar
McLean, E. O. and Black, C. A., (1965) Aluminum Methods of Soil Analysis Madison, WI. Am. Soc. Agron. 978–988.Google Scholar
Siever, R., (1962) Silica solubility, 0–-200°C, and the diagenesis of siliceous sediments J. Geol. 70 127–150.CrossRefGoogle Scholar
Tweneboah, C. K. Greenland, D. J. and Oades, J. M., (1967) Changes in charge characteristics of soils after treatment with 0,5 M calcium chloride at pH 1,5 Aust. J. Soil Res. 5 247–261.CrossRefGoogle Scholar
Weaver, R. M., (1973) Mineralogy of highly weathered soils of the humid tropics McGraw-Hill Yearbook of Science and Technology New York. McGraw-Hill 379–380.Google Scholar