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Trace element chemistry and U-Pb dating of zircons from oceanic gabbros and their relationship with whole rock composition (Lanzo, Italian Alps)

Kaczmarek, M.-A.; Muntener, Othmar; Rubatto, Daniela

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The U-Pb ages and the trace element content of zircon U-Pb along with major and trace element whole rock data on gabbroic dikes from the Lanzo lherzolitic massif, N-Italy, have been determined to constrain crustal accretion in ocean-continent transition zones. Three Fe-Ti gabbros were dated from the central and the southern part of the massif providing middle Jurassic ages of 161 ± 2, 158 ± 2 and 163 ± 1 Ma, which argue for magmatic activity over few millions of years. Zircon crystals are...[Show more]

dc.contributor.authorKaczmarek, M.-A.
dc.contributor.authorMuntener, Othmar
dc.contributor.authorRubatto, Daniela
dc.date.accessioned2015-12-07T22:54:03Z
dc.identifier.issn1432-0967
dc.identifier.urihttp://hdl.handle.net/1885/28007
dc.description.abstractThe U-Pb ages and the trace element content of zircon U-Pb along with major and trace element whole rock data on gabbroic dikes from the Lanzo lherzolitic massif, N-Italy, have been determined to constrain crustal accretion in ocean-continent transition zones. Three Fe-Ti gabbros were dated from the central and the southern part of the massif providing middle Jurassic ages of 161 ± 2, 158 ± 2 and 163 ± 1 Ma, which argue for magmatic activity over few millions of years. Zircon crystals are characterized by high but variable Th/U ratios, rare earth element patterns enriched in heavy rare earths, pronounced positive Ce and negative Eu-anomalies consistent with crystallization after substantial plagioclase fractionation. The zircon trace element composition coupled with whole rock chemistry was used to reconstruct the crystallization history of the gabbros. A number of gabbros crystallized in situ, and zircon precipitated from trapped, intercumulus liquid, while other gabbros represent residual liquids that were extracted from a cumulus pile and crystallized along syn-magmatic shear zones. We propose a model in which the emplacement mechanism of gabbroic rocks in ocean-continent transition zones evolves from in situ crystallization to stratified crystallization with efficient extraction of residual liquid along syn-magmatic shear zones. Such an evolution of the crystallization history is probably related to the thermal evolution of the underlying mantle lithosphere.
dc.publisherSpringer
dc.sourceContributions to Mineralogy and Petrology (Electronic)
dc.subjectKeywords: accretion; crystallization; dike; emplacement; gabbro; Jurassic; magmatism; ocean-continent transition; plagioclase; rare earth element; shear zone; thermal evolution; trace element; uranium-lead dating; zircon; Eurasia; Europe; Italy; Southern Europe Lanzo massif; Oxyde gabbros; Peridotite; Piemont-Ligurian ocean; SHRIMP; Trace element geochemistry; U-Pb dating; Zircon
dc.titleTrace element chemistry and U-Pb dating of zircons from oceanic gabbros and their relationship with whole rock composition (Lanzo, Italian Alps)
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume155
dc.date.issued2008
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationu4047674xPUB55
local.type.statusPublished Version
local.contributor.affiliationKaczmarek, M.-A., University of Neuchatel
local.contributor.affiliationMuntener, Othmar, Swiss Federal Institute of Technology (ETH)
local.contributor.affiliationRubatto, Daniela, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage295
local.bibliographicCitation.lastpage312
local.identifier.doi10.1007/s00410-007-0243-3
dc.date.updated2015-12-07T12:45:56Z
local.identifier.scopusID2-s2.0-38149032945
local.identifier.thomsonID000252294400002
CollectionsANU Research Publications

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