SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 27:408-412 (1963)
© 1963 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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CaO-Zro2 Molar Ratios as an Index of Weathering1

A. H. Beavers, J. B. Fehrenbacher, P. R. Johnson and Robert L. Jones2

ABSTRACT

Content of calcium, zirconium, iron, and potassium were determined by X-ray spectrographic analysis in six loessial soils comprising a chronosequence in southern Illinois. The molar ratio of CaO to ZrO2 in the fine- and coarsesilt fractions yields a negative straight line relationship with the log of the distance from loess source. Relative weathering between the end members of the sequence as expressed both by calcium loss data and CaO/ZrO2 ratios indicates that major loess deposition ended from 11,000 to 11,800 years ago, a date in good agreement with radiocarbon data for withdrawal of glacial ice from northern Illinois. Using these data, the ratio of time during to time since loess deposition is about 1:1. The data also indicate that the first one-half to two-thirds of Peorian loess was deposited faster than the surficial portion.

NOTES

1 Contribution of the Department of Agronomy, University of Illinois, Urbana. Published with the approval of the Director of the Illinois Agr. Exp. Sta. Presented before Div. V, Soil Science Society of America, Chicago, Ill., Dec. 5, 1960.

2 Associate Professor of Soil Mineralogy, Associate Professor of Pedology, Graduate Assistant, and Graduate Assistant, respectively. The third and fourth authors are presently Soil Scientist, SCS, USDA, and Research Associate, Agronomy Department, University of Illinois, respectively.

Received for publication September 10, 1962. Accepted for publication October 2, 1962.






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