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dc.contributor.author
Von Gosen, W.
dc.contributor.author
McClelland, W. C.
dc.contributor.author
Loske, W.
dc.contributor.author
Martinez, Juan Cruz
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dc.contributor.author
Prozzi, Carlos
dc.date.available
2016-07-13T21:02:28Z
dc.date.issued
2014-05
dc.identifier.citation
Von Gosen, W.; McClelland, W. C.; Loske, W.; Martinez, Juan Cruz; Prozzi, Carlos; Geochronology of igneous rocks in the Sierra Norte de Córdoba (Argentina): Implications for the Pampean evolution at the western Gondwana margin; Geological Society of America; Lithosphere; 6; 4; 5-2014; 277-300
dc.identifier.uri
http://hdl.handle.net/11336/6493
dc.description.abstract
U-Pb zircon data (secondary ion mass spectrometry [SIMS] and thermal ionization mass spectrometry [TIMS] analyses) from igneous rocks with differing structural fabrics in the Sierra Norte de Córdoba, western Argentina, suggest that the sedimentary, tectonic, and magmatic history in this part of the Eastern Sierras Pampeanas spans the late Neoproterozoic–Early Cambrian. A deformed metarhyolite layer in metaclastic sedimentary rocks gives a crystallization age of 535 ± 5 Ma, providing a limit on the timing of the onset of D1 deformation and metamorphism. The new data coupled with published Neoproterozoic zircon dates from a rhyolite beneath the metaclastic section and detrital zircon ages from the section indicate a late Neoproterozoic to Early Cambrian depositional age, making this section time equivalent with the Puncoviscana Formation (sensu lato) of northwest Argentina. A synkinematic granite porphyry gives a crystallization age of 534 ± 5 Ma, providing a limit on the age of dextral mylonitization in the Sierra Norte area (D2 event). The new age is consistent with ages of 533 ± 4 Ma from a mylonitic granite with dextral sense-of-shear fabrics and 531 ± 4 Ma from a late-synkinematic dacitic porphyry, which broadly indicates the final age of dextral deformation. A crystallization age of zircons from the postkinematic, high-level El Tío granite (530 ± 4 Ma) suggests that both stages of Pampean deformation and regional metamorphism, accompanied by synkinematic intrusions, were followed by uplift and took place during a very short time span in the Early Cambrian. This is supported by zircon dates of 523 ± 5 Ma from a rhyolite to dacite in the western part of the Rodeito area and dates from the undeformed El Escondido rhyolite and granite of 519 ± 4 Ma and 521 ± 4 Ma, respectively. These three crystallization ages also indicate that ductile dextral shearing and mylonitization associated with the Pampean D2 event terminated in the Early Cambrian. Both stages of Pampean deformation in this segment of the western pre-Andean Gondwana margin seem to represent a continuous event that can be related to oblique dextral convergence between the overriding plate in the east and the subducting and finally colliding plate in the west. The postkinematic intrusions and extrusions are related to the late stage of the Pampean magmatic history, which terminated before Early Ordovician (Famatinian) time.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Geological Society of America
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Western Gondwana
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Deformation
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Zircon
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Metamorphism
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Mineralogía
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.subject.classification
Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Geochronology of igneous rocks in the Sierra Norte de Córdoba (Argentina): Implications for the Pampean evolution at the western Gondwana margin
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-07-12T15:19:57Z
dc.identifier.eissn
1947-8264
dc.journal.volume
6
dc.journal.number
4
dc.journal.pagination
277-300
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Von Gosen, W.. Friedrich-Alexander-Universität; Alemania
dc.description.fil
Fil: McClelland, W. C.. University of Iowa; Estados Unidos
dc.description.fil
Fil: Loske, W.. Ludwig-Maximilians-UNiversität München; Alemania
dc.description.fil
Fil: Martinez, Juan Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Geológico del Sur; Argentina. Universidad Nacional del Sur; Argentina
dc.description.fil
Fil: Prozzi, Carlos. Universidad Nacional del Sur. Departamento de Geologia. Catedra de Petrologia; Argentina
dc.journal.title
Lithosphere
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1130/L344.1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/10.1130/L344.1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://lithosphere.gsapubs.org/content/6/4/277.abstract
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