dc.creatorVoldman, Gustavo Gabriel
dc.creatorAlonso, J. L.
dc.creatorFernandez, L. P.
dc.creatorBanchig, Aldo Luis
dc.creatorAlbanesi, Guillermo Luis
dc.creatorOrtega, Gladys del Carmen
dc.creatorCardó, Raúl
dc.date.accessioned2018-05-02T18:14:30Z
dc.date.available2018-05-02T18:14:30Z
dc.date.created2018-05-02T18:14:30Z
dc.date.issued2016-10
dc.identifierVoldman, Gustavo Gabriel; Alonso, J. L.; Fernandez, L. P.; Banchig, Aldo Luis; Albanesi, Guillermo Luis; et al.; Cambrian-Ordovician conodonts from slump deposits of the Argentine Precordillera: new insights into its passive margin development; Cambridge University Press; Geological Magazine; 155; 1; 10-2016
dc.identifier0016-7568
dc.identifierhttp://hdl.handle.net/11336/43889
dc.identifierCONICET Digital
dc.identifierCONICET
dc.description.abstractThe Los Sombreros Formation represents the western continental margin slope deposits of the Argentine Precordillera, a sub-terrane accreted to Gondwana as part of the Cuyania Terrane in early Palaeozoic times. The age of these gravity-driven deposits is controversial and, therefore, a precise biostratigraphic scheme is essential to reveal the evolution of the continental margin. New conodont samplings along with sedimentological and structural analysis carried out in the Los Sombreros Formation in the La Invernada Range provide clues to its depositional framework. The sedimentary succession is made up of dominantly calciturbidites, carbonate breccias and conglomerates, along with mudstones that represent the pelagic/hemipelagic background sedimentation. It displays hectometric to outcrop-scale slump folds with variable hinge-line orientations and pinch-and-swell structures, evidencing soft-sediment deformation, consistent with a slope to base-of-slope setting. Three limestone samples from this succession include conodonts referable to the pandemic Hirsutodontus simplex Subzone of the Cordylodus intermedius Zone (upper Furongian, Cambrian) and from the Macerodus dianae Zone (upper Tremadocian, Ordovician), implying that a slope connected the shallow-water shelf with a deep-water (oceanic) basin at least since late Cambrian times. The conodont faunas show affinities to coeval assemblages from outer shelf and slope environments around Laurentia yet they are not conclusive to postulate a geographic origin for the Precordillera. The thermal alteration of the conodonts is consistent with sedimentary burial and nappe stacking in this sector of the Precordillera.
dc.languageeng
dc.publisherCambridge University Press
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1017/S0016756816000832
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/geological-magazine/article/cambrianordovician-conodonts-from-slump-deposits-of-the-argentine-precordillera-new-insights-into-its-passive-margin-development/F8656295695DCE0EDB363FEF2E842A01
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectArgentine Precordillera
dc.subjectCambrian
dc.subjectConodont
dc.subjectLos Sombreros Formation
dc.subjectOrdovician
dc.subjectSlope Facies
dc.subjectSlump
dc.titleCambrian-Ordovician conodonts from slump deposits of the Argentine Precordillera: new insights into its passive margin development
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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