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Development of rodingite in basaltic rocks in serpentinites, East Liguria, Italy

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Abstract

Hydrogrossular replacement of plagioclase in basaltic rocks enclosed in serpentinite, and relationships between hydrogrossular, pumpellyite, vesuvianite are described. Rogingitic rocks are dominated by mixed layer chlorite-smectite, chlorite, pumpellyite, hydrogrossular and vesuvianite. In these rocks pumpellyite attains maximal Mg contents, and chemical analysis shows extreme removal of Na2O, K2O, TiO2 and SiO2 from the basalts, and increase in the Fe3+/Fe2+ ratio. Leaching during serpentinization by extremely alkaline solutions dominated by Ca-Mg(OH) may explain removal of components, but the oxidation may suggest that at an earlier stage dykes may have acted as input aquifers.

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Author notes

  1. F. Barriga

    Present address: Departamento de Geologia, Universidade de Lisboa, Portugal

Authors and Affiliations

  1. Department of Geology, University of Western Ontario, N6A 5B7, London, Canada

    F. Barriga & W. S. Fyfe

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  1. F. Barriga
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  2. W. S. Fyfe
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Barriga, F., Fyfe, W.S. Development of rodingite in basaltic rocks in serpentinites, East Liguria, Italy. Contr. Mineral. and Petrol. 84, 146–151 (1983). https://doi.org/10.1007/BF00371281

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  • DOI: https://doi.org/10.1007/BF00371281

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