The carbon isotope geochemistry of goethite (alpha-FeOOH) in ironstone of the Upper Ordovician Neda Formation, Wisconsin, USA - Implications for early Paleozoic continental environments

Details The carbon isotope geochemistry of goethite (alpha-FeOOH) in ironstone of the Upper Ordovician Neda Formation, Wisconsin, USA - Implications for early Paleozoic continental environments The carbon isotope geochemistry of goethite (alpha-FeOOH) in ironstone of the Upper Ordovician Neda Formation, Wisconsin, USA - Implications for early Paleozoic continental environments

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2599y&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 11, p. 2599-2611.

Mathematics

Logic

13

Carbon Isotopes, Chemical Composition, Geochemistry, Iron Compounds, Petrology, Chemical Reactions, Solid Solutions, Weathering

Scientific paper

Carbon isotope exchange experiments and data from natural samples in a state of isotopic disequilibrium indicate that the apparent Fe(CO3)OH component in natural goethites is a closed system. These results support the solid solution model for Fe(CO3)OH in goethite. The carbon isotope geochemistry of the oolitic Neda Formation ironstone at occurrences in Wisconsin and Iowa is consistent with goethite formation in a Late Ordovician subaerial weathering environment. The delta C-13 values of the Fe(CO3)OH component in Neda Formation goethite indicate that organic matter was being oxidized to produce CO2 in the ancient weathering profile. At depths greater than about 20 cm, the partial pressure of CO2 in the Late Ordovician weathering profile was 5.6 times larger than the P(CO2) of the earth's atmosphere at that time. This high 'soil' CO2 partial pressure and its origin in the oxidation of organic matter suggest that there was substantial biological activity on continental land surfaces prior to the widespread colonization by vascular plants. It indicates a possible role for biological activity in the chemical weathering of continents in the early Paleozoic.

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