K-bentonites in the Argentine Precordillera contemporaneous with rhyolite volcanism in the Famatinian Arc

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dc.contributor.authorFanning, Christopher
dc.contributor.authorPankhurst, Robert J
dc.contributor.authorRapela, Carlos W
dc.contributor.authorBaldo, Edgardo
dc.contributor.authorCasquet, Cesar
dc.contributor.authorGalindo, Carmen
dc.date.accessioned2015-12-13T23:08:01Z
dc.date.issued2004
dc.date.updated2015-12-12T08:11:49Z
dc.description.abstractNew U-Pb radiometric dates for K-bentonite horizons within the Lower Cambrian to Middle Ordovician platform carbonates from the Precordillera terrane of NW Argentina provide further constraints on models for the allochthonous or parautochthonous accretion of this terràne. Two K-bentonite layers from the Talacasto section yield indistinguishable sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon dates of 469.5 + 3.2 Ma and 470.1 ± 3.3 Ma respectively. These are within uncertainty of the U-Pb SHRIMP zircon date of 468.3 = 3.4 Ma for a porphyritic rhyolite from the Famatinian magmatic arc, Sierra de las Planchadas, near Rio Chaschuil. Geochemical and isotope data also demonstrate the similarity of the K-bentonite and Chaschuil rhyolite parent magmas. Thus, it is highly probable that the Famatinian arc volcanoes. provided the ash for the K-bentonite horizons, suggesting proximity to the Precordillera terrane during the deposition of the Lower Cambrian to Middle Ordovician platform carbonates. This implication supports a mid-Ordovician collision model, but could also be compatible with a parautochthonous model for docking of the Precordillera terrane, by movement along the Pacific margin of Gondwana, rather than across the Iapetus Ocean.
dc.identifier.issn0016-7649
dc.identifier.urihttp://hdl.handle.net/1885/86466
dc.publisherGeological Society of London
dc.sourceJournal of the Geological Society
dc.subjectKeywords: bentonite; Cambrian; continental collision; Gondwana; Ordovician; uranium-lead dating; volcanism Gondwana; Ordovician; SHRIMP; Terranes; U-Pb
dc.titleK-bentonites in the Argentine Precordillera contemporaneous with rhyolite volcanism in the Famatinian Arc
dc.typeJournal article
local.bibliographicCitation.lastpage756
local.bibliographicCitation.startpage747
local.contributor.affiliationFanning, Christopher, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationPankhurst, Robert J, British Geological Survey
local.contributor.affiliationRapela, Carlos W, Universidad Nacional de La Plata
local.contributor.affiliationBaldo, Edgardo, Universidad Nacional de Cordoba
local.contributor.affiliationCasquet, Cesar, Universidad Complutense de Madrid
local.contributor.affiliationGalindo, Carmen, Universidad Complutense de Madrid
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.absfor040203 - Isotope Geochemistry
local.identifier.absfor040313 - Tectonics
local.identifier.ariespublicationMigratedxPub15358
local.identifier.citationvolume161
local.identifier.doi10.1144/0016-764903-130
local.identifier.scopusID2-s2.0-4344575329
local.identifier.uidSubmittedByMigrated
local.type.statusPublished Version

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