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Mid- to Late Cambrian docking of the Río de la Plata craton to southwestern Gondwana: Age constraints from U-Pb SHRIMP detrital zircon ages from Sierras de Ambato and Velasco (Sierras Pampeanas, Argentina)

Verdecchia, Sebastian O.; Casquet, Cesar; Baldo, Edgardo; Pankhurst, Robert J; Rapela, Carlos W; Fanning, Christopher; Galindo, Carmen

Description

The Early Palaeozoic stratigraphy and tectonic history of the Eastern Sierras Pampeanas of central Argentina are complicated by metamorphism and deformation resulting from the Pampean (545-510 Ma) and Famatinian (490-440 Ma) orogenies. We report U-Pb sensitive high-resolution ion microprobe dating of detrital zircons in two metasedimentary successions exposed at Quebrada de La Cébila (c. 28°45'S, 66°25'W): the Ambato and the La Cébila metamorphic complexes. The Ambato zircons record age peaks...[Show more]

dc.contributor.authorVerdecchia, Sebastian O.
dc.contributor.authorCasquet, Cesar
dc.contributor.authorBaldo, Edgardo
dc.contributor.authorPankhurst, Robert J
dc.contributor.authorRapela, Carlos W
dc.contributor.authorFanning, Christopher
dc.contributor.authorGalindo, Carmen
dc.date.accessioned2015-12-10T23:36:14Z
dc.identifier.issn0016-7649
dc.identifier.urihttp://hdl.handle.net/1885/70060
dc.description.abstractThe Early Palaeozoic stratigraphy and tectonic history of the Eastern Sierras Pampeanas of central Argentina are complicated by metamorphism and deformation resulting from the Pampean (545-510 Ma) and Famatinian (490-440 Ma) orogenies. We report U-Pb sensitive high-resolution ion microprobe dating of detrital zircons in two metasedimentary successions exposed at Quebrada de La Cébila (c. 28°45'S, 66°25'W): the Ambato and the La Cébila metamorphic complexes. The Ambato zircons record age peaks corresponding to Pampean (530 ± 10 Ma), Brasiliano (c. 570 and c. 640 Ma), Grenville (c. 950 to c. 1025 Ma) and minor Neoarchaean ages. Similar peaks are also apparent in the La Cébila sample but it additionally contains Palaeoproterozoic zircons (c. 2.1 Ga) corresponding to the age of the Rio de la Plata craton, from which they are considered to have been sourced. Our interpretation is that the protolith of the Ambato complex was deposited prior to juxtaposition with the craton and is older than the Early Ordovician La Cébila metamorphic complex. We infer that the craton reached its current relative position in the Mid- to Late Cambrian, after the main Pampean tectonothermal event (530-520 Ma) and before deposition of the La Cébila protolith and the Achavil Formation (Sierra de Famatina), which contain comparable detrital zircon populations.
dc.publisherGeological Society of London
dc.sourceJournal of the Geological Society
dc.subjectKeywords: Age constraints; Argentina; Cambrians; Detrital zircon; Ordovician; Palaeozoic; Protoliths; Relative positions; Sensitive high-resolution ion microprobe; Tectonic history; Tectono-thermal event; U-Pb SHRIMP; Structural geology; Zircon; Stratigraphy; Brasi
dc.titleMid- to Late Cambrian docking of the Río de la Plata craton to southwestern Gondwana: Age constraints from U-Pb SHRIMP detrital zircon ages from Sierras de Ambato and Velasco (Sierras Pampeanas, Argentina)
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume168
dc.date.issued2011
local.identifier.absfor040303 - Geochronology
local.identifier.absfor040311 - Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy)
local.identifier.absfor040313 - Tectonics
local.identifier.ariespublicationf2965xPUB2209
local.type.statusPublished Version
local.contributor.affiliationVerdecchia, Sebastian O., Universidad Nacional de Cordoba
local.contributor.affiliationCasquet, Cesar, Universidad Complutense de Madrid
local.contributor.affiliationBaldo, Edgardo, Universidad Nacional de Cordoba
local.contributor.affiliationPankhurst, Robert J, British Geological Survey
local.contributor.affiliationRapela, Carlos W, Universidad Nacional de La Plata
local.contributor.affiliationFanning, Christopher, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGalindo, Carmen, Universidad Complutense de Madrid
local.description.embargo2037-12-31
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage1061
local.bibliographicCitation.lastpage1071
local.identifier.doi10.1144/0016-76492010-143
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T08:23:24Z
local.identifier.scopusID2-s2.0-79959499320
local.identifier.thomsonID000291636300020
CollectionsANU Research Publications

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