Basement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana

dc.contributor.authorRapela, Carlos W
dc.contributor.authorPankhurst, Robert J
dc.contributor.authorFanning, Christopher
dc.contributor.authorGrecco, L
dc.date.accessioned2015-12-13T23:07:05Z
dc.date.issued2003
dc.date.updated2015-12-12T08:07:54Z
dc.description.abstractU-Pb sensitive high-resolution ion microprobe data together with geochemical and Nd isotope analyses obtained in the basement complex of the Sierra de la Ventana Fold Belt indicate that the Early Palaeozoic passive margin history of the basin followed Cambrian magmatism related to rifting in a 600 Ma Neoproterozoic crust. The Cambrian episode started with intrusion of 531 ± 4 and 524 ± 5 Ma A- and I-type granites derived from a dehydrated infracrustal source (cNd530 - 3.1 to -5.9), and culminated with eruption of high-Zr peralkaline spherulitic rhyolites derived from an undepleted lithospheric mantle (509 ± 5 Ma; cNd509 +0.5 to +1.0). These rift-related magmatic rocks were covered by shelf sediments deposited along a once-continuous passive margin, encompassing the Sierra de la Ventana Fold Belt, the Cape Fold Belt, the Falkland/Malvinas microplate and the Ellsworth Mountains block in Antarctica. The Cambrian rifting event defined the outline shape of the southern part of Gondwana, and can be regarded as the initiation of the supercontinent stage, which lasted until Jurassic break-up. The conjugate continental fragments separated from Gondwana during the Cambrian rifting could be the source for microcontinents with c. 1000 Ma basement rocks that collided with the proto-Andean margin during Ordovician-Silurian times.
dc.identifier.issn0016-7649
dc.identifier.urihttp://hdl.handle.net/1885/86057
dc.publisherGeological Society of London
dc.sourceJournal of the Geological Society
dc.subjectKeywords: basement rock; Cambrian; geochemistry; geochronology; granite; rifting; SHRIMP dating; tectonic evolution; South America Geochronology; Gondwana; Granites; Rifting; U-Pb SHRIMP
dc.titleBasement evolution of the Sierra de la Ventana Fold Belt: new evidence for Cambrian continental rifting along the southern margin of Gondwana
dc.typeJournal article
local.bibliographicCitation.lastpage628
local.bibliographicCitation.startpage613
local.contributor.affiliationRapela, Carlos W, Universidad Nacional de La Plata
local.contributor.affiliationPankhurst, Robert J, British Geological Survey
local.contributor.affiliationFanning, Christopher, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGrecco, L, Universidad Nacional del Sur
local.contributor.authoremailu4029993@anu.edu.au
local.contributor.authoruidFanning, Christopher, u4029993
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor040303 - Geochronology
local.identifier.absfor040313 - Tectonics
local.identifier.ariespublicationMigratedxPub14795
local.identifier.citationvolume160
local.identifier.doi10.1144/0016-764902-112
local.identifier.scopusID2-s2.0-0042266266
local.identifier.uidSubmittedByMigrated
local.type.statusPublished Version

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