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Book: Acid Sulfate Weathering
Published by: Soil Science Society of America

 

This chapter in ACID SULFATE WEATHERING

  1.  p. 109-125
    SSSA Special Publication 10.
    Acid Sulfate Weathering

    J.A. Kittrick, D.S. Fanning and L.R. Hossner (ed.)

    ISBN: 978-0-89118-905-3

     

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doi:10.2136/sssaspecpub10.c7

Morphological and Mineralogical Features Related to Sulfide Oxidation under Natural and Disturbed Land Surfaces in Maryland1

  1. D. P. Wagner,
  2. D. S. Fanning,
  3. J. E. Foss,
  4. M. S. Patterson and
  5. P. A. Snow2

Abstract

Soils and geologic materials exhibiting properties related to sulfide oxidation in upland positions in the Coastal Plain and Appalachian surface mine areas of Maryland were investigated. Features attributable to acid sulfate processes were observed both in recently excavated sulfide-bearing materials as well as in soils on undisturbed land surfaces. Relative to underlying unoxidized strata, near-surface zones of active or recently active sulfide oxidation are characterized by higher contents of free iron oxides, lower contents of total and sulfide-S, and higher contents of sulfate-S. In a profile developed in recently exposed sulfidic sediments, ratios of sulfate-S to total S range from almost 1 near the surface to less than 0.2 below 80 cm. Sulfate minerals associated with recent sulfide oxidation include jarosite, gypsum, copiapite, rozenite, and szomolnokite. These minerals were observed as mottles or efflorescences along ped faces, in soil pores, and on rock surfaces. Jarosite and gypsum were the only sulfate minerals identified under natural land surfaces. The subsoil and substrata of an undisturbed Ultisol developed from glauconitic sediments were found to contain up to 0.3 % S as jarosite.

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Copyright © 1982. Copyright 1982 by the Soil Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA