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Weathering crusts on peridotite

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Abstract

Chemical weathering of dark-green massive peridotite, including partly serpentinized peridotite, produces a distinct and remarkable brown weathering rind when exposed to the atmosphere long enough. The structure and mineral composition of crusts on rocks from the Ronda peridotite, Spain, have been studied in some detail. The generic overall weathering reaction serpentinized peridotite + rainwater = weathering rind + runoff water describes the crust-forming process. This hydration reaction depends on water supply from the outcrop surface to the reaction front separating green peridotite from the brown crust. The reaction pauses after drying and resumes at the front after wetting. The overall net reaction transforms olivine to serpentine in a volume-conserving replacement reaction. The crust formation can be viewed as secondary serpentinization of peridotite that has been strongly altered by primary hydrothermal serpentinization. The reaction stoichiometry of the crust-related serpentinization is preserved and reflected by the composition of runoff waters in the peridotite massif. The brown color of the rind is caused by amorphous Fe(III) hydroxide, a side product from the oxidation of Fe(II) released by the dissolution of fayalite component in olivine.

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Acknowledgments

Antonio Carcia-Casco from the University of Granada provided precise information on the localities of garnet peridotite in the Ronda massif. His responsive help is gratefully acknowledged. Careful reviews by Bernard Evans, Ralf Milke, and an anonymous reviewer are appreciated. We also thank Chris Ballhaus for his mindful editorial handling of the manuscript.

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  1. Mineralogy and Petrology, University of Freiburg, Albertstr. 23b, 79104, Freiburg, Germany

    Kurt Bucher, Ingrid Stober & Hiltrud Müller-Sigmund

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  1. Kurt Bucher
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  2. Ingrid Stober
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Correspondence to Kurt Bucher.

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Communicated by Chris Ballhaus.

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Bucher, K., Stober, I. & Müller-Sigmund, H. Weathering crusts on peridotite. Contrib Mineral Petrol 169, 52 (2015). https://doi.org/10.1007/s00410-015-1146-3

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