Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
reserved
Keywords:
isotopic
;
southern Italy
;
Mt. Vulture
;
04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology
;
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
;
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Format:
901510 bytes
Format:
application/pdf
