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This article in SSSAJ

  1. Vol. 44 No. 1, p. 155-159
     
    Received: May 10, 1979
    Published: Jan, 1980


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doi:10.2136/sssaj1980.03615995004400010032x

Association of Trace Elements with Iron Oxides During Rock Weathering1

  1. R. D. Koons,
  2. P. A. Helmke and
  3. M. L. Jackson2

Abstract

Abstract

The association of trace elements with Fe oxides during the early stages of rock weathering was determined by analysis of fresh diabase and granite rocks, their associated whole and size-separated saprolites, and goethite by neutron activation and X-ray fluorescence. The same elements are found to be associated with Fe oxides when the results are interpreted by analysis of correlation, by the distribution of elements in the various size fractions, by the effects of removing free Fe oxides, and by direct analysis of geothite from the saprolite. The elements Co, Cr, Mn, Sc, Th, U, Zn, and the heavy rare-earth elements during the weathering of diabase, and As, Co, Cr, Sc, Th, U, Zn, and the heavy rare-earth elements during the weathering of granite are associated with Fe oxides. The concentrations of Mn are too low in this system to separate the effects of Mn oxides from those of Fe oxides.

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