Hostname: page-component-848d4c4894-5nwft Total loading time: 0 Render date: 2024-06-02T15:45:01.260Z Has data issue: false hasContentIssue false
  • English
  • Français

Oxidation State of Iron in Glauconite from Oxidized and Reduced Zones of Soil-Geologic Columns

Published online by Cambridge University Press:  02 April 2024

D. S. Fanning ,
M. C. Rabenhorst ,
Leopold May  and
D. P. Wagner
D. S. Fanning
Affiliation:
Department of Agronomy, University of Maryland, College Park, Maryland 20742
M. C. Rabenhorst
Affiliation:
Department of Agronomy, University of Maryland, College Park, Maryland 20742
Leopold May
Affiliation:
Department of Chemistry, The Catholic University of America, Washington D.C. 20064
D. P. Wagner
Affiliation:
Geo-Sci Consultants, Inc., College Park, Maryland 20740
Get access Rights & Permissions [Opens in a new window]

Abstract

Glauconite from the oxidized and reduced zones of soil-geologic columns at two Coastal Plain sites, one in Maryland and one in New Jersey, was examined by Mössbauer spectroscopy. The data indicate that glauconite in the reduced zones had a higher proportion of its structural iron in the ferrous, as opposed to the ferric state. The Fe2+/Fe3+ ratio ranged from 0 to 0.2 for the glauconite from the oxidized zone and was about 0.35 for the glauconite in the reduced zones. Despite the presence of pyrite in the reduced zone, which might be expected to make ferric iron unstable because of the presence of sulfide S, about 75% of the Fe in the glauconite in the reduced zone was in the ferric state. Thin section analysis showed some glauconite in the reduced zones to be intimately associated with pyrite and some aggregates of fine pyrite crystals were locally present in cracks in glauconite pellets. In the oxidized zones, pyrite was absent and the glauconite was more yellow under plane-polarized light, as opposed to more green for the glauconite in the reduced zones. These data indicate that reports of studies of glauconite should stipulate whether samples are from the oxidized or reduced zone of soil-geologic columns.

Keywords

GlauconiteIronMössbauer spectroscopyOxidized zonePyriteReduced zoneSoil
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 1 , February 1989 , pp. 59 - 64
Copyright
Copyright © 1989, The Clay Minerals Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

1

Contribution 7756 and Scientific Article A-4753 of Maryland Agricultural Experiment Station, Department of Agronomy, College Park, Maryland 20742.

References

Carson, C. D., Fanning, D. S., Dixon, J. B., Kittrick, J. A., Fanning, D. S. and Hossner, L. R., 1982 Al-fisols and Ultisols with acid sulfate weathering features in Texas Soil Sci. Soc. Amer. Spec. Publ 127 – 146.CrossRefGoogle Scholar
CofTman, C. B. and Fanning, D. S., 1974 Vermiculite determination on whole soils by cation-exchange capacity methods Clays & Clay Minerals 22 271 – 283.CrossRefGoogle Scholar
Fanning, D. S., Keramidas, V. Z., Dixon, J. B. and Weed, S. B., 1977 Micas Soil Sci. Soc. Amer., Madison, Wisconsin 195 – 258.Google Scholar
Johnson, L. J. and Chu, C. H. (1983) Mineralogical characterization of selected soils from northeastern United States: Penna. State Univ. Agri. Expt. Sta. Bull. 847, 32 pp.Google Scholar
Markley, M. L., 1971 Soil survey of Burlington County, New Jersey: U.S. Dept Washington, D.C Agriculture Soil Conservation Service.Google Scholar
McConchie, D. M., Ward, J. B., McCann, V. H. and Lewis, D. W., 1979 A Mössbauer investigation of glauconite and its geological significance Clays & Clay Minerals 27 339 – 348.CrossRefGoogle Scholar
Montano, P. A., 1981 Characterization of iron-bearing minerals in coal Adv. Chem. Ser. 192 337 – 361.CrossRefGoogle Scholar
Nordstrom, D. K., Kittrick, J. A., Fanning, D. S. and Hossner, L. R., 1982 Aqueous pyrite oxidation and consequent formation of secondary iron minerals Acid Sulfate Weathering Wisconsin Madison 37 – 56.Google Scholar
Odom, I. E. and Bailey, S. W., 1984 Glauconite and celadonite minerals Reviews in Mineralogy 13 Washington, D.C Mineralogical Society of America 545 – 572.Google Scholar
Snow, P. A., 1981 Quantitative determination of total and forms of sulfur in soil and geologic materials employing X-ray spectroscopy: Ph.D. dissertation Maryland University of Maryland, College Park.Google Scholar
Stucki, J. W. and Roth, C. B., 1977 Oxidation-reduction mechanism for structural iron in nontronite Soil Sci. Soc. Amer. J. 41 808 – 814.CrossRefGoogle Scholar
Tapper, M. and Fanning, D. S., 1968 Glauconite pellets: Similar X-ray patterns from individual pellets of lobate and vermiform morphology Clays & Clay Minerals 16 275 – 283.CrossRefGoogle Scholar
Wagner, D. P., 1982 Acid sulfate weathering in upland soils of the Maryland Coastal Plain: Ph.D. dissertation Maryland University of Maryland, College Park.Google Scholar
Wagner, D. P., Fanning, D. S., Foss, J. E., Patterson, M. S., Snow, P. A., Kittrick, J. A., Fanning, D. S. and Hossner, L. R., 1982 Morphological and mineralogical features related to sulfide oxidation under natural and disturbed land surfaces in Maryland Acid Sulfate Weathering Wisconsin Madison 109 – 125.Google Scholar