Trace element and isotopic variations from Mt. Vulture to Campanian volcanoes: constraints for slab detachment and mantle inflow beneath southern Italy |
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| Authors: | G De Astis P D Kempton A Peccerillo T W Wu |
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| Institution: | (1) INGV - Osservatorio Vesuviano, Via Diocleziano 328, 80124 Napoli, Italy;(2) Natural Environment Research Council, Polaris House, North Star Avenue, Swindon, SN2 1EU, UK;(3) Dipartimento di Scienze della Terra, University of Perugia, Piazza Università, 06100 Perugia, Italy;(4) Department of Geology, University of Western Ontario, London, ON, Canada, N6A 5B7 |
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| Abstract: | New Sr–Nd–Pb isotopic ratios and trace element data for volcanic mafic rocks outcropping along a E–W transect in southern
Italy, from Mt. Vulture to Neapolitan volcanoes, are reported. The variation of LILE/HFSE, HFSE/HFSE and radiogenic isotopes
along this transect indicates that all of these volcanoes contain both intra-plate and subduction-related signatures, with
the former decreasing from Mt. Vulture to Campanian volcanoes. New data are also reported for the Paleocene alkaline rocks
from Pietre Nere (Apulia foreland), which show isotopic ratios mostly overlapping the values for Mediterranean intra-plate
volcanoes as well as the Eocene–Oligocene alkaline mafic lavas from the northern Adria plate. Pietre Nere provides evidence
for an OIB mantle composition of FOZO-type, free of subduction influences, that is present beneath the Adria plate (Africa)
before its collision with Europe. After this collision, and formation of the southern Apennines, westward inflow of mantle
from the Adria plate to the Campanian area occurred, as a consequence of slab break off. Interaction of subduction components
with inflowing Adria mantle generated hybrid sources beneath the Vulture–Campania area, which can explain the compositional
features of both Mt. Vulture and the Campanian mafic rocks. Therefore, mafic magmas from these volcanoes represent variable
degrees of mixing between different mantle components. |
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