Early Carboniferous sub- to mid-alkaline magmatism in the Eastern Sierras Pampeanas, NW Argentina: A record of crustal growth by the incorporation of mantle-derived material in an extensional setting

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dc.contributor.authorAlasino, Pablo H.
dc.contributor.authorDahlquist, Juan A.
dc.contributor.authorPankhurst, R.J.
dc.contributor.authorGalindo Francisco, María Del Carmen
dc.contributor.authorCasquet Martín, César
dc.contributor.authorRapela, Carlos W.
dc.contributor.authorLarrovere, M.A.
dc.contributor.authorFanning, C.M.
dc.date.accessioned2023-06-20T03:33:13Z
dc.date.available2023-06-20T03:33:13Z
dc.date.issued2012
dc.description.abstractA recently discovered granitic intrusion at Cerro La Gloria in western Sierra de Famatina (NW Argentina) is representative of sub- to mid-alkaline Carboniferous magmatism in the region. The main rock type consists of microcline, quartz and plagioclase, with amphibole, magnetite, ilmenite, biotite, epidote, zircon, allanite and sphene as accessory minerals. We report a U–Pb zircon SHRIMP age for the pluton of 349±3 Ma (MSWD=1.1), i.e., Tournaisian. Whole-rock chemical composition and Nd isotope analyses are compatible with an origin by melting of older mafic material in the lower crust (εNdt between −0.58 and +0.46 and TDM values of about 1.1 Ga). The pluton is intruded by penecontemporaneous to late alkaline mafic dykes that are classified as back-arc basalts. Coeval, Early Carboniferous A-type granites occur farther east in the Sierras Pampeanas, probably generated during lithospheric stretching. Overall, the Early Carboniferous granitic rocks show a west-to-east mineralogical and isotopic zonation indicating that magma genesis involved a greater contribution of juvenile material of mantle character to the west. Based on the observed patterns of geochronology, geochemistry and field relationships we suggest that A-type magma genesis in the Eastern Sierras Pampeanas was linked to an Andean-type margin where the lithospheric mantle played a role in its generation.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/21700
dc.identifier.doi10.1016/j.gr.2011.12.011
dc.identifier.issn1342-937X
dc.identifier.officialurlhttp://www.journals.elsevier.com/gondwana-research
dc.identifier.urihttps://hdl.handle.net/20.500.14352/43847
dc.journal.titleGondwana research
dc.language.isoeng
dc.page.final1008
dc.page.initial992
dc.publisherElsevier Science B. V., Amsterdam
dc.rights.accessRightsopen access
dc.subject.cdu551.73(238)
dc.subject.keywordEarly Carboniferous
dc.subject.keywordSub- to mid-alkaline magmatism
dc.subject.keywordSierras Pampeanas
dc.subject.keywordTectonic switching
dc.subject.keywordWestern Gondwana margin
dc.subject.ucmGeología estratigráfica
dc.subject.unesco2506.19 Estratigrafía
dc.titleEarly Carboniferous sub- to mid-alkaline magmatism in the Eastern Sierras Pampeanas, NW Argentina: A record of crustal growth by the incorporation of mantle-derived material in an extensional setting
dc.typejournal article
dc.volume.number22
dspace.entity.typePublication
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relation.isAuthorOfPublicationa4fea134-2fb2-4157-9dd1-a3d6002ba005
relation.isAuthorOfPublication.latestForDiscoverya4fea134-2fb2-4157-9dd1-a3d6002ba005
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