Details

Autor(en) / Beteiligte

• Wagner, D. P
• Fanning, D. S
• Foss, J. E
• Patterson, M. S
• Snow, P. A
• Hossner, L.R
• Fanning, D.S
• Kittrick, J.A

Titel

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

Ist Teil von

• Acid Sulfate Weathering, 1982, p.109-125

Ort / Verlag

Madison, WI, USA: Soil Science Society of America

Erscheinungsjahr

1982

Link zum Volltext

Quelle

Wiley Online Library All Obooks

Beschreibungen/Notizen

• 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.