New insights into the Aeolian Islands and other arc source compositions from high-precision olivine chemistry
Artículo
Open/ Download
Publication date
2017Metadata
Show full item record
Cómo citar
Zamboni, Denis
Cómo citar
New insights into the Aeolian Islands and other arc source compositions from high-precision olivine chemistry
Author
Abstract
The Aeolian arc (Italy) is characterized by some of the strongest along-the-arc geochemical variations in the
planet, making it an ideal location to study the effect of subducting components in modifying the mantle source
of island arc melts. Here, we use high-precision element concentrations in primitive phenocrystic olivine from
basalts along the arc to elucidate the effects of mantle source modification by the subduction process. Olivines
from this arc have Ni concentrations and Fe/Mn ratios that show similarity to peridotite sources that melted
to produce mid-ocean ridge basalts. Nevertheless, they also have systematically lower Ca concentrations and
Fe/Mn ratios that broadly overlap with olivines from the available global arc array. These phenocrysts also do
not show significant variations in Ca as a function of olivine forsterite content. The global data suggest that all
olivines crystallizing from island-arcmelts have suppressed Ca concentrations and Fe/Mn ratios, relative to olivines
derived frommelts at intraplate andmid-ocean ridge settings suggesting elevated H2O concentrations and higher
oxidation state of the equilibrium melts. Based on olivine chemistry, we interpret a predominantly peridotite
source (fluxed by subduction fluids) beneath the Aeolian Arc and also for other examples of arc-related lavas.
Indexation
Artículo de publicación SCOPUS
Identifier
URI: https://repositorio.uchile.cl/handle/2250/168782
DOI: 10.1016/j.lithos.2016.12.004
ISSN: 18726143
00244937
Quote Item
Lithos 272–273 (2017) 185–191
Collections