Pb Isotopes Data from the Campanian Volcanic Province: A Model to Generate These Distinctive Pb Isotopic Variations

Angelo Paone

doi:10.4236/ojg.2015.51001

Abstract

A broad set of samples from the CVP has been analyzing Pb isotopes. Campanian Volcanic Province (CVP) has been produced by various ranges of mixing between three components: 1) MORB, 2) Hercynian basement and 3) upper crust. Anyhow, the upper crust that has modified the Pb isotopic composition also shows trends towards an Achaean upper crust. This is consistent for all Mediterranean area. This is not in contrast with the past plate tectonic reconstruction. Also the surface sediments (GLOSS) may have been a mixing between the Achaean upper crust and a Hercynian component with an implication worldwide due to the rock cycle processes.

Highlights

The Campanian Volcanic Province (Figure 1) is made of the following volcanic area: Somma-Vesuvius volcano [1], Campi Flegrei Volcanic District [2] [3], Roccamonfina volcano [3] and the Island of Ponza and Ventotene [4]
The Pb isotopic composition is presented from mainly the Somma-Vesuvius volcano and cover the eruption ages from Somma caldera activity [
I can say that the Campanian volcanic products are produced by a MORB component that has been contaminated by a series of upper crust component [20]

Summary

Introduction

The Campanian Volcanic Province (Figure 1) is made of the following volcanic area: Somma-Vesuvius volcano [1], Campi Flegrei Volcanic District [2] [3], Roccamonfina volcano [3] and the Island of Ponza and Ventotene [4]. The magmas erupted have a sediments signature due to the adjacent Adria slab subducting [4] [7] Tomographic results confirm this scenario ([8], references therein). Such variations appear to reflect both AFC processes and chemical heterogeneity in the upper mantle that may be linked to subduction processes. Low-K Roccamonfina rocks are geochemically similar to those from Campi Flegrei, Ventotene, and Somma-Vesuvius, suggesting a similar proportion of sediment in their upper mantle source regions [3]

Sampling and Analytical Techniques

Discussion

16.1 Archean

Conclusion