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U-Pb SHRIMP dating of detrital zircons of Neoproterozoic para-amphibolites from the Difunta Correa sequence (Western Sierras Pampeanas, Argentina)

dc.contributor.authorRapela, C.
dc.contributor.authorPankhurst, R. J.
dc.contributor.authorCasquet Martín, César
dc.contributor.authorFanning, C. M.
dc.contributor.authorGalindo, Carmen
dc.contributor.authorBaldo, Edgardo G.
dc.description.abstractThe Neoproterozoic Difunta Correa meta-sedimentary sequence (DCSS) of Western Sierras Pampeanas is a cover to a rejuvenated Grenvillian basement. The Western Sierras Pampeanas are allegedly part of the exotic Precordillera Terrane, which was accreted to the proto-Andean margin of Gondwana in lower Palaeozoic times. A para-amphibolite from this sedimentary sequence contains abundant zircons mostly consisting of detrital igneous cores with a metamorphic overgrowth. The latter formed at 439±34 Ma, i.e., during the Famatinian orogeny, although mantles are also found with mixed Grenvillian - Ordovician ages due to Pb-loss. Ages of igneous cores are ~ 625 Ma , 1050-1150 Ma and 1200-1500 Ma with a peak at c. 1.4 Ga. The ~ 625 Ma group zircon is of Gondwanan provenance and this age is an upper value for the age of the host amphibolite. An age between 580 Ma and 620 Ma is inferred for the DCSS. The provenance of zircons between 1.05 Ga and c. 1.2 Ga probably lies in the underlying Grenvillian basement. However zircons older than 1.2 Ga were derived from an unexposed area: palaeogeographical considerations suggest that this area could be either in Laurentia (trans-Laurentia belt) or in southern Amazonia (Rondonia- San Ignacio belt), both 1.3-1.5 Ga in ageen_US
dc.publisherSociedad Geológica de Españaen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.subject.otherSHRIMP zircon datingen_US
dc.subject.otherSierras Pampeanasen_US
dc.titleDatación U-Pb SHRIMP de circones detríticos en paranfibolitas neoproterozoicas de las secuencia Difunta Correa (Sierras Pampeanas Occidentales, Argentina)en_US
dc.titleU-Pb SHRIMP dating of detrital zircons of Neoproterozoic para-amphibolites from the Difunta Correa sequence (Western Sierras Pampeanas, Argentina)eng

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