O–H–Sr–Nd isotope constraints on the origin of the Famatinian magmatic arc, NW Argentina

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dc.contributor.authorAlasino, Pablo H.
dc.contributor.authorCasquet Martín, César
dc.contributor.authorGalindo Francisco, María Del Carmen
dc.contributor.authorPankhurst, R.J.
dc.contributor.authorRapela, Carlos W.
dc.contributor.authorDahlquist, Juan A.
dc.contributor.authorRecio, C.
dc.contributor.authorBaldo, Edgardo G.
dc.contributor.authorLarrovere, Mariano Alexis
dc.contributor.authorRamacciotti, Carlos
dc.date.accessioned2023-06-16T15:18:30Z
dc.date.available2023-06-16T15:18:30Z
dc.date.issued2020
dc.description.abstractWe report a study of whole-rock O–H–Sr–Nd isotopes of Ordovician igneous and metamorphic rocks exposed at different crustal palaeodepths along c. 750 km in the Sierras Pampeanas, NW Argentina. The isotope compositions preserved in the intermediate rocks (mostly tonalite) (average δ18O = +8.7 ± 0.5‰, δD = −73 ± 14‰, 87Sr/86Srt = 0.7088 ± 0.0001 and εNdt = −4.5 ± 0.6) show no major difference from those of most of the mafic rocks (average δ18O = +8 ± 0.8‰, δD = −84 ± 18‰, 87Sr/86Srt = 0.7082 ± 0.0016 and εNdt = −4 ± 1.1), suggesting that most of their magmas acquired their crustal characteristics in the mantle. The estimate of assimilation of crustal material (δ18O = +12.2 ± 1.7‰, δD = −89 ± 21‰, 87Sr/86Srt = 0.7146 ± 0.0034 and εNdt = −6.9 ± 0.7) by the tonalite is in most samples within the range 10–20%. Felsic magmas that reached upper crustal levels had isotope values (δ18O = +9.9 ± 1.5‰, δD= −76 ± 5‰, 87Sr/86Srt = 0.7067 ± 0.0010, εNdt = −3.5 ± 1.4) suggesting that they were not derived by fractionation of the contaminated intermediate magmas, but evolved from different magma batches. Some rocks of the arc, both igneous (mostly gabbro and tonalite) and metamorphic, underwent restricted interaction with meteoric fluids. Reported values of δ18O of magmatic zircons from the Famatinian arc rocks (+6 to +9‰) are comparable to our δ18O whole-rock data, indicating that pervasive oxygen isotope exchange in the lower crust was not a major process after zircon crystallization.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/60722
dc.identifier.doi10.1017/S0016756820000321
dc.identifier.issn0016-7568, ESSN: 1469-5081
dc.identifier.officialurlhttps://www.cambridge.org/core/journals/geological-magazine/article/ohsrnd-isotope-constraints-on-the-origin-of-the-famatinian-magmatic-arc-nw-argentina/05C9D120786DFAD1E04C440351240986
dc.identifier.urihttps://hdl.handle.net/20.500.14352/6285
dc.journal.titleGeological Magazine
dc.language.isoeng
dc.publisherCambridge University Press
dc.relation.projectIDCGL2016-76439-P
dc.rights.accessRightsrestricted access
dc.subject.cdu552.3(82)
dc.subject.keywordFamatinian arc magmatism
dc.subject.keywordstable and radiogenic isotopes
dc.subject.keywordcontinental growth
dc.subject.keywordnon-homogenized magmatic system
dc.subject.ucmGeoquímica
dc.subject.ucmPetrología
dc.subject.unesco2503 Geoquímica
dc.titleO–H–Sr–Nd isotope constraints on the origin of the Famatinian magmatic arc, NW Argentina
dc.typejournal article
dspace.entity.typePublication
relation.isAuthorOfPublicationa4fea134-2fb2-4157-9dd1-a3d6002ba005
relation.isAuthorOfPublicationf2fb71b6-b7fd-4fc6-bf39-d4de3ba5a67c
relation.isAuthorOfPublication.latestForDiscoverya4fea134-2fb2-4157-9dd1-a3d6002ba005
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