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Meteoric sphaerosiderite lines and their use for paleohydrology and paleoclimatology

Geology

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, , , , , , and

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Abstract

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 18O 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 ??18O and thus allow evaluation of paleohydrology and paleoclimate in humid continental settings.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Meteoric sphaerosiderite lines and their use for paleohydrology and paleoclimatology
Series title:
Geology
Volume
26
Issue:
11
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
1039
Last page:
1042