Geochemical changes due to weathering under varying climatic conditions

Details Geochemical changes due to weathering under varying climatic conditions Geochemical changes due to weathering under varying climatic conditions

Sep 1955

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1955gecoa...8..109m&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 8, Issue 3, p. 109-130.

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Scientific paper

Nine soil profiles from New Zealand, developed on arkosic parent material and under varying climatic conditions, were investigated, using mechanical, microscopical, X-ray, differential thermal, chemical, and spectrographic methods of analysis. It is found that, with an increase in annual temperature,' the percentage of clay rises and of organic matter falls. The processes responsible for formation of clay minerals are shown to be more active at depth than in the surface horizons, and hence percentage clay curves and percentage clay mineral curves may depart widely from each other in their angles of slope. With increase in temperature, larger quantities of kaolinite are formed, while under cooler conditions hydrous mica becomes more prominent. The chemical analyses reveal that effects of weathering are more readily observable in silt fractions than in clay fractions. The distribution of major and minor elements are related to the geochemical laws in terms of precipitation, adsorption, camouflage, and capture, and the influence of organic matter is also discussed. Relationships between concentration of minor elements and climatic conditions are considered, and it would seem that generally an increase in temperature means loss of minor elements with the exception of zirconium and yttrium.

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