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New geochemical, U–Pb SIMS geochronology and Lu–Hf isotopic data in zircon from Tandilia basement rocks, Río de la Plata craton, Argentina

2021-06Journal article Open access
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dc.contributor.authorAngeletti, Melisa
dc.contributor.authorChichorro, Martim
dc.contributor.authorCastro, Antonio
dc.contributor.authorFrisicale, María Cristina
dc.contributor.authorSolá, A. Rita
dc.contributor.authorDimieri, Luis Vicente
dc.date.accessioned2021-06-08T17:36:15Z
dc.date.available2021-06-08T17:36:15Z
dc.date.issued2021-06
dc.description.abstractIn this paper new geochemical, geochronological and isotopic Lu–Hf data from the Siempre Amigos Hills (SA), western Tandilia, Argentina, is presented. Outcrops in this small area include representative lithologies of the basement Río de la Plata craton (RPC) known as Tandilia Terrane. The new geochemical data characterize a heterogeneous Paleoproterozoic crust with a similar U–Pb SIMS magmatic age (~2.1 Ga) represented by a suite of mafic (amphibolites, charnockitic granulites), intermediate and felsic compositions (diorites, granodiorites and granitic gneisses), as well as intrusive granitic rocks (with Neoproterozoic age of ~652 Ma in zircon). Geochemical features suggest processes of magmatic differentiation from a mafic igneous protolith associated with the ‘Camboriu orogeny’ of the Trans-Amazonian–Eburnean cycle. Some amphibolites may represent sanukitoid magmas similar to those formed at the Archean-Proterozoic transition. This paper examines the hy-pothesis of a sanukitoid precursor for RPC Rhyacian magmatism. The potassic and calc-alkaline character of magmatic series, together with negative Nb–Ta–Ti anomalies and REE patterns, are compatible with classical modern subduction-related magmas. Precise Lu–Hf analyses of zircons collected from a granodiorite and a gneiss indicate a predominantly juvenile source (+εHf), with minor crustal recycling (-εHf). An inheritance age is recorded in a single Neoarchaean zircon core from a granodiorite (2771 ±15 Ma), similar to calculated maximum Hf TDM (2.8 Ga). Considering the new available data from this region of the RPC, a sustainable petrogenetic model is proposed to explain the presence of geochemical and isotopic evidence of sanukitoid magmatism which may have occurred after 2.7 Ga, which seems to constitute a magmatic series which is a precursor to the development of the Rhyacian magmatic arc in the Tandilia Terrane. Medium-to high-grade metamorphic conditions probably resulted from Paleoproterozoic subduction followed by the intrusion of huge volumes of Rhyacian calc-alkaline magmatism. This model is compatible with RPC configuration as a collage of terranes, and also consistent with Trans-Amazonian–Eburnean amalgamation of various microcontinents in the formation of Atlantica.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doihttps://doi.org/10.1016/j.jsames.2021.103199pt_PT
dc.identifier.issn0895-9811
dc.identifier.urihttp://hdl.handle.net/10400.9/3558
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationCONICET - PIP Nº 11220150100269 COpt_PT
dc.relationANPCyT - PICT 2012–0644pt_PT
dc.relationUNS- PGI project (Cod. 24/H137)pt_PT
dc.relationMarie Skłodowska-Curie grant agreement nº 778045pt_PT
dc.relationGeoBioTec - UIDB/04035/2020pt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0895981121000468?via%3Dihubpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectHf TDM model Agespt_PT
dc.subjectIsotopic signaturept_PT
dc.subjectSanukitoidspt_PT
dc.subjectModern subductionpt_PT
dc.subjectPara-autochthonous terranespt_PT
dc.subjectTrans-amazonian orogenypt_PT
dc.titleNew geochemical, U–Pb SIMS geochronology and Lu–Hf isotopic data in zircon from Tandilia basement rocks, Río de la Plata craton, Argentinapt_PT
dc.title.alternativeEvidence of a sanukitoid precursor for some Paleoproterozoic granitoidspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleJournal of South American Earth Sciencespt_PT
oaire.citation.volume108pt_PT
person.familyNameChichorro
person.familyNameCastro
person.familyNameFrisicale
person.familyNameSolá
person.givenNameMartim Afonso
person.givenNameAntonio
person.givenNameMaría Cristina
person.givenNameA. Rita
person.identifier.ciencia-idBC1D-671F-1296
person.identifier.ciencia-id6816-2560-2353
person.identifier.ciencia-id4713-7D9F-6567
person.identifier.orcid0000-0001-5000-0736
person.identifier.orcid0000-0002-7257-2556
person.identifier.orcid0000-0002-4709-0264
person.identifier.orcid0000-0001-9567-5470
person.identifier.ridG-6378-2015
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication067ee98f-dbbe-49cb-b4b1-20215419882e
relation.isAuthorOfPublication5c5106a0-655d-4e74-9f1a-62438b8c72f9
relation.isAuthorOfPublicatione585b56e-c818-4982-93b3-6c55865ee8af
relation.isAuthorOfPublication96d92535-8625-449c-b580-01e42baaa59c
relation.isAuthorOfPublication.latestForDiscovery5c5106a0-655d-4e74-9f1a-62438b8c72f9

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