Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..487v&link_type=abstract
Earth and Planetary Science Letters, Volume 107, Issue 3-4, p. 487-498.
Physics
1
Scientific paper
A new geochemical model is used here for the first time in the interpretation of intra-plate igneous rocks. This model is able to simulate one major and so far unexplained feature of the Italian potassic magmas: the regional isotopic trends along the chain of volcanoes. Starting from the now widely accepted inference that these trends are a result of large-scale mixing between continental-crustal and mantle materials within the lithosphere and prior to magma generation and volcanism, isotopic requirements of a suitable magma source are illustrated. This mixing has been linked with extreme enrichment in potassium and associated elements by the concept of source metasomatism. Here a one-dimensional diffusion-controlled advective flow model to simulate concentration and isotopic changes during metasomatism is described, as are the conditions under which this model can schematically reproduce the required source features.
Modelling suggests that progressive regional changes from northwest to southeast in end-member contributions (i.e. the fluid/rock ratio in a metasomatic model) was controlled by progressive variations in either the fluid velocity or the duration of the fluid flow. Both could have acted concomitantly if the fluid was released by a mantle hotspot and infiltrated crustal material-possibly located in the lithospheric mantle-during anti-clockwise rotation of Italy in the Tertiary. It is suggested that previously metasomatised domains in the lithosphere were susceptible to fusion under tensional stress, so that the alkaline volcanism now traces the path of the ancient plate movement over the asthenosphere hotspot.
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