A combined zircon Hf isotope and whole-rock Nd and Sr isotopes study of Carboniferous A-type granites, Sierras Pampeanas of Argentina

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dc.contributor.authorDahlquist, Juan Andrés
dc.contributor.authorGalindo Francisco, María Del Carmen
dc.contributor.authorMorales Cámera, Matías M.
dc.contributor.authorMoreno Moreno, Juan Antonio
dc.contributor.authorAlasino, Pablo H.
dc.contributor.authorBasei, Miguel A.S.
dc.contributor.authorMacchioli Grande, Marcos
dc.date.accessioned2023-06-16T15:16:55Z
dc.date.available2023-06-16T15:16:55Z
dc.date.issued2020-06
dc.description.abstractWe report new whole-rock Nd and Sr isotope data for two strongly peraluminous and one slightly peraluminous Carboniferous A-type granitic plutons in the eastern Sierras Pampeanas of Argentina. Our study also integrates previous petrological and geochemical information with in situ U–Pb and Hf isotope data from magmatic and inherited zircon. Strongly peraluminous samples have pronounced negative εNdt values (−7.6 and −7.0) and very high (87Sr/86Sr)t values (0.728778 and 0.747092). These are similar to isotope compositions reported for the Puncoviscan Series, a metasedimentary sequence metamorphosed during the Lower Cambrian and intruded by these granites. Nd and Sr isotope data for the slightly peraluminous sample (εNdt = −3.5 and 87Sr/86Srt = 0.708074), together with previously reported petrological and geochemical data, indicate that the basement of the Sierras de Córdoba participated in the generation of the parental magma. The new data are not easily reconciled with the positive zircon εHft values previously reported for these samples, which suggest dominantly juvenile material in the source. We propose that Hf was transferred from inherited zircon toward the magmatic rim, without complete isotopic homogenization with the magma, as has been hypothesized in previous works. Our results reveal that the indiscriminate use of Hf databases can lead to false inference of crustal growth by mantle addition through time and misleading comparisons between granitic rocks worldwide.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN)
dc.description.sponsorshipFONCyT (Argentina)
dc.description.sponsorshipBrazilian public grant
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/59972
dc.identifier.doi10.1016/j.jsames.2020.102545
dc.identifier.issn0895-9811, ESSN: 1873-0647
dc.identifier.officialurlhttps://www.sciencedirect.com/science/article/abs/pii/S0895981120300584?via%3Dihub
dc.identifier.urihttps://hdl.handle.net/20.500.14352/6158
dc.issue.number102545
dc.journal.titleJournal of South American Earth Sciences
dc.language.isoeng
dc.publisherElsevier
dc.relation.projectIDCGL2016-76439-P,
dc.relation.projectIDFONCyT PICT 2016 0843
dc.relation.projectIDPIP0178 CONICET
dc.relation.projectIDConsolidar 2018 SECyT-UNC
dc.relation.projectIDPUE2016 100016 CONICET
dc.relation.projectIDFAPESP 2018/06837-3
dc.relation.projectID2015/03737-0
dc.rights.accessRightsrestricted access
dc.subject.cdu552.321(82)
dc.subject.ucmPetrología
dc.titleA combined zircon Hf isotope and whole-rock Nd and Sr isotopes study of Carboniferous A-type granites, Sierras Pampeanas of Argentina
dc.typejournal article
dc.volume.number100
dspace.entity.typePublication
relation.isAuthorOfPublicationf2fb71b6-b7fd-4fc6-bf39-d4de3ba5a67c
relation.isAuthorOfPublication3430fe86-05c7-483c-be07-5d9bea372858
relation.isAuthorOfPublication.latestForDiscoveryf2fb71b6-b7fd-4fc6-bf39-d4de3ba5a67c
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