Contributions to Mineralogy and Petrology

, Volume 84, Issue 2–3, pp 146–151 | Cite as

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

  • F. Barriga
  • W. S. Fyfe
Article

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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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • F. Barriga
    • 1
  • W. S. Fyfe
    • 1
  1. 1.Department of GeologyUniversity of Western OntarioLondonCanada
  2. 2.Departamento de GeologiaUniversidade de LisboaPortugal

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