Provenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation

dc.creatorAbre, P.
dc.creatorCingolani, Carlos Alberto
dc.creatorZimmermann, U.
dc.creatorCairncross, B.
dc.creatorChemale Jr., F.
dc.date2011
dc.date2023-08-07T18:09:23Z
dc.date.accessioned2024-07-24T03:28:14Z
dc.date.available2024-07-24T03:28:14Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/156023
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9534257
dc.descriptionThe Ordovician Ponón Trehué Formation is the only early Palaeozoic sedimentary sequence known to record a primary contact with the Grenvillian-age basement of the Argentinean Cuyania terrane, in its southwards extension named the San Rafael block. Petrographic and geochemical data indicate contributions from a dominantly upper continental crustal component and a subordinated depleted component. Nd isotopes indicate εNd of −4.6, ƒSm/Nd −0.36 and TDM 1.47 Ga in average. Pb-isotope ratios display average values for 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb of 19.15, 15.69 and 38.94 respectively. U–Pb detrital zircon ages from the Ponón Trehué Formation cluster around values of 1.2 Ga, indicating a main derivation from a local basement source (Cerro La Ventana Formation). The Upper Ordovician Pavón Formation records a younger episode of clastic sedimentation within the San Rafael block, and it shows a more complex detrital zircon age population (peaks at 1.1 and 1.4 Ga as well as Palaeoproterozoic and Neoproterozoic detrital grains). Detailed comparison between the two Ordovician clastic units indicates a shift with time in provenance from localized basement to more regional sources. Middle to early Upper Ordovician age is inferred for accretion of the Cuyania terrane to the proto-Andean margin of Gondwana.
dc.descriptionCentro de Investigaciones Geológicas
dc.formatapplication/pdf
dc.format275-290
dc.languageen
dc.rightshttp://creativecommons.org/licenses/by/4.0/
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)
dc.subjectCiencias Naturales
dc.subjectCuyania terrane
dc.subjectProvenance
dc.subjectGeochemistry
dc.subjectIsotope geochemistry
dc.subjectDetrital zircon dating
dc.subjectOrdovician
dc.subjectPonón Trehué and Pavón Formations
dc.titleProvenance of Ordovician clastic sequences of the San Rafael Block (Central Argentina), with emphasis on the Ponón Trehué Formation
dc.typeArticulo
dc.typeArticulo


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