Abstract
Weathering experiments with mafic and ultramafíc rock material were carried out under different atmospheric conditions, such as a CO2, a N2 —CO2 — H2 —H2S, and a N2 —O2 —CO2 atmosphere. Thus, a primordial, possible Early Archean, and a present-day atmosphere have been simulated. The experiments were carried out in an especially designed apparatus equipped with pH and redox electrodes to monitor pH and the oxidation poten-tial over the whole period of the experiments.
The experimental results show that weathering under the CO2-rich, H2S-bearing, hypothetical Archean atmosphere was much more intense than under the modern atmosphere. Ferrous iron released by dissolution remained in solution together with Ca, Mg, Na, and K until the solubility products of various ferrous sulfides were exceeded. Given the experimental conditions (Eh—pH — Fe 2+aq ), the precipitated ferrous sulfides lie within the monosulfide stability field on appropriate phase diagrams.
Deduction of a rate law for the cation dissolution is difficult for our experiments because of the superimposition of reactions involving oxidation of Fe2+ , precipitation of FeS, and scavenging by precipitates of various solute species.
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Wiggering, H., Neumann-Mahlkau, P., Selbach, HJ. (1992). Experimental Procedures to Simulate Weathering Under Atmospheres Which May Have Characterized the Early Archean. In: Schidlowski, M., Golubic, S., Kimberley, M.M., McKirdy, D.M., Trudinger, P.A. (eds) Early Organic Evolution. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76884-2_4
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