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Abstract:

The application of the sensitive high-resolution ion microprobe (SHRIMP) U/Pb dating technique to zircon and monazites of different rock types of the Sierra de San Luis provides an important insight into the provenance and timing of deposition of the sedimentary precursors as well as the metamorphic and igneous history of the various basement domains. Additional constraints on the Famatinian metamorphic episode are provided by Pb/Pb stepwise leaching experiments on one staurolite and two garnet separates. The results indicate that the sedimentary precursors of the Conlara Metamorphic Complex have a maximum age of c. 590 Ma, whereas the Pringles Metamorphic Complex metasediments appear to be sourced from the Pampean orogen in the Early Cambrian. Folded xenoliths within the c. 496 Ma El Peñón pluton suggest that the host Conlara Metamorphic Complex underwent a Pampean compression. From a 208Pb/232Th monazite age of 478 Ma for a migmatite from the Nogolí Metamorphic Complex, the structural evolution of this basement complex appears to be entirely post-Pampean. Onset of the Famatinian high-grade metamorphism, between c. 500 Ma and c. 450 Ma, follows a period of crustal extension on the western outboard of Gondwana and might not be related directly to a Mid-Ordovician accretion of the Cuyania Terrane.

Registro:

Documento: Artículo
Título:Neoproterozoic to Early Palaeozoic events in the Sierra de San Luis: Implications for the Famatinian geodynamics in the Eastern Sierras Pampeanas (Argentina)
Autor:Steenken, A.; Siegesmund, S.; López de Luchi, M.G.; Frei, R.; Wemmer, K.
Filiación:Instituto de Geocronología y Geología Isotópica, Pabellón INGEIS, C1428EHA Buenos Aires, Argentina
Geoscience Centre, University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany
Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen, Denmark
Palabras clave:deposition; geodynamics; ion microprobe; metamorphism; monazite; Paleozoic; Proterozoic; provenance; uranium-lead dating; zircon; Argentina; San Luis; Sierra de San Luis; Sierras Pampeanas; South America
Año:2006
Volumen:163
Número:6
Página de inicio:965
Página de fin:982
DOI: http://dx.doi.org/10.1144/0016-76492005-064
Título revista:Journal of the Geological Society
Título revista abreviado:J. Geol. Soc.
ISSN:00167649
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167649_v163_n6_p965_Steenken

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Citas:

---------- APA ----------
Steenken, A., Siegesmund, S., López de Luchi, M.G., Frei, R. & Wemmer, K. (2006) . Neoproterozoic to Early Palaeozoic events in the Sierra de San Luis: Implications for the Famatinian geodynamics in the Eastern Sierras Pampeanas (Argentina). Journal of the Geological Society, 163(6), 965-982.
http://dx.doi.org/10.1144/0016-76492005-064
---------- CHICAGO ----------
Steenken, A., Siegesmund, S., López de Luchi, M.G., Frei, R., Wemmer, K. "Neoproterozoic to Early Palaeozoic events in the Sierra de San Luis: Implications for the Famatinian geodynamics in the Eastern Sierras Pampeanas (Argentina)" . Journal of the Geological Society 163, no. 6 (2006) : 965-982.
http://dx.doi.org/10.1144/0016-76492005-064
---------- MLA ----------
Steenken, A., Siegesmund, S., López de Luchi, M.G., Frei, R., Wemmer, K. "Neoproterozoic to Early Palaeozoic events in the Sierra de San Luis: Implications for the Famatinian geodynamics in the Eastern Sierras Pampeanas (Argentina)" . Journal of the Geological Society, vol. 163, no. 6, 2006, pp. 965-982.
http://dx.doi.org/10.1144/0016-76492005-064
---------- VANCOUVER ----------
Steenken, A., Siegesmund, S., López de Luchi, M.G., Frei, R., Wemmer, K. Neoproterozoic to Early Palaeozoic events in the Sierra de San Luis: Implications for the Famatinian geodynamics in the Eastern Sierras Pampeanas (Argentina). J. Geol. Soc. 2006;163(6):965-982.
http://dx.doi.org/10.1144/0016-76492005-064