Earth-prints repository, logo   DSpace

About DSpace Software
|earth-prints home page | roma library | bologna library | catania library | milano library | napoli library | palermo library
Please use this identifier to cite or link to this item:

Authors: Correale, A.*
Paonita, A.*
Rizzo, A.*
Grassa, F.*
Martelli, M.*
Title: The carbon-isotope signature of ultramafic xenoliths from the Hyblean Plateau (southeast Sicily, Italy): Evidence of mantle heterogeneity
Title of journal: Geochemistry, Geophysics, Geosystems
Series/Report no.: /16 (2015)
Publisher: American Geophysical Union
Issue Date: 4-Mar-2015
DOI: 10.1002/2014GC005656
Keywords: xenoliths
mantle heterogeneity
Hyblean Plateau
fluid inclusions
isotopic carbon
Abstract: We investigated the carbon isotope composition of mantle source beneath the Hyblean Plateau (southeast Sicily, Italy) by studying CO2 in fluid inclusions from ultramafic xenoliths recovered in some Miocene diatremes. In order to constrain the processes influencing the isotopic marker of carbon we combined d13CCO2 results with information about noble gases (He and Ar) obtained in a previous investigation of the same products. Although Ar/CO2 and He/Ar ratios provide evidence of Rayleigh-type fractional degassing, the isotopic geochemistry of carbon is poorly influenced by this process. Mixing related to metasomatic processes where MORB-type pyroxenitic melts permeate a peridotite mantle probably contaminated by crustal fluids inherited from a fossil subduction can explain the measured d13C and CO2/3He variations, ranging from 24&to 22& and from 109 to 1010, respectively. Simple mass-balance calculations highlighted that the Hyblean peridotite source was mainly contaminated by the carbonate source, being carbonate and organic matter present at a ratio that varied within the range from 7:1 to 4:1.
Appears in Collections:04.01.03. Mantle and Core dynamics
04.04.12. Fluid Geochemistry
Papers Published / Papers in press

Files in This Item:

File Description SizeFormatVisibility
Correale_et_al-Gcubed_2015.pdfmain article612.66 kBAdobe PDFonly authorized users View/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Share this record




Stumble it!



Valid XHTML 1.0! ICT Support, development & maintenance are provided by CINECA. Powered on DSpace Software. CINECA