Contributions to Mineralogy and Petrology

, Volume 16, Issue 4, pp 328–353 | Cite as

The problem of rock assimilation by Somma-Vesuvius magma

I. Composition of Somma and Vesuvius lavas
  • Carlo Savelli


New chemical and modal analyses are presented of magmatic rocks and pyroxenes nodules from the Somma-Vesuvius volcano and of trachytes from the surrounding area. Geochemical evidence is employed in checking the generally accepted suggestion that magma composition develops from that of trachyte into phonolitic tephrite and finally into tephritic leucitite (vesuvite) by assimilation of dolomite.

At the Somma stage of the volcano, phonolitic tephrites (tephritic phonolites) alone have been produced. Vesuvius lavas (tephritic leucitites) are comparatively high in K2O, CaO, F, Cl, Mn, Cu, Sr and Ba and low in SiO2 and Nb. The formation of vesuvites by assimilation of dolomitic sedimentary rocks, combined with gravity-separation of early-formed pyroxenes from a trachytic or tephritic magma, is improbable as shown by chemical balances between the respective igneous and sedimentary rocks.


Nodule SiO2 Assimilation Dolomite Mineral Resource 
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Copyright information

© Springer-Verlag 1967

Authors and Affiliations

  • Carlo Savelli
    • 1
  1. 1.Geochemisches Institut der Universität GöttingenDeutschland

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