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Geology; November 1998; v. 26; no. 11; p. 1039-1042; DOI: 10.1130/0091-7613(1998)026<1039:MSLATU>2.3.CO;2
© 1998 Geological Society of America
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Meteoric sphaerosiderite lines and their use for paleohydrology and paleoclimatology

Greg A. Ludvigson1, Luis A. González2, Ronald A. Metzger3, Brian J. Witzke1, Robert L. Brenner2, Angela P. Murillo2 and Tim S. White2

1 Iowa Department of Natural Resources Geological Survey Bureau, Iowa City, Iowa 52242-1319
2 Department of Geology, University of Iowa, Iowa City, Iowa 52242-1379
3 Southwestern Oregon Community College, Coos Bay, Oregon 97420-2956

Sphaerosiderite, a morphologically distinct millimeter-scale spherulitic siderite (FeCO3), forms predominantly in wetland soils and sediments, and is common in the geologic record. Ancient sphaerosiderites are found in paleosol horizons within coal-bearing stratigraphic intervals and, like their modern counterparts, are interpreted as having formed in water-saturated environments. Here we report on sphaerosiderites from four different stratigraphic units, each of which has highly variable 13C and relatively stable 18C compositions. The unique isotopic trends are analogous to well-documented meteoric calcite lines, which we define here as meteoric sphaerosiderite lines. Meteoric sphaerosiderite lines provide a new means of constraining ground-water {delta}18O and thus allow evaluation of paleohydrology and paleoclimate in humid continental settings.




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