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Abstract:

Major, trace, and rare-earth element data for Puncoviscana Formation metasediments were used to constrain their provenance and tectonic setting. This unit, which crops out in northwest Argentina, consists mainly of pelite-greywacke turbidite sequences. Incipient regional metamorphism and a polyphase deformation, with a main deformation during the latest Proterozoic-earliest Cambrian Braziliano orogeny, affected the sedimentary sequences. The enrichment in light rare-earth and other incompatible trace elements over compatible ones, as well as the high and uniform Th/Sc ratios, indicate a predominance of upper-crust acid rocks as parental material. Some chemical characteristics of these rocks, such as their high Th/U, Rb/Sr, and Zr/Sc ratios, imply sedimentary recycling. On the basis of tectonic discriminant diagrams that employ trace elements considered relatively immobile during low-grade metamorphism, a passive margin setting can be inferred. Moreover, the comparison of the trace element contents of Puncoviscana metapelites with those of mudstones deposited in known tectonic settings shows the closest matching with passive margin shales. © 2005 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina
Autor:Do Campo, M.; Ribeiro Guevara, S.
Filiación:INGEIS-CONICET, Facultad de Ciencias Exactas y Naturales, U.B.A., Pabellón INGEIS, 1428 Buenos Aires, Argentina
LAAN, Centro Atómico Bariloche, CNEA, 8400 S.C. Bariloche, Argentina
Palabras clave:Geochemistry; Metasediments; Passive margin; Pre-cambrian; Turbidites; metasediment; Proterozoic; Argentina; South America; Western Hemisphere; World
Año:2005
Volumen:19
Número:2
Página de inicio:143
Página de fin:153
DOI: http://dx.doi.org/10.1016/j.jsames.2005.01.003
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v19_n2_p143_DoCampo

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Citas:

---------- APA ----------
Do Campo, M. & Ribeiro Guevara, S. (2005) . Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina. Journal of South American Earth Sciences, 19(2), 143-153.
http://dx.doi.org/10.1016/j.jsames.2005.01.003
---------- CHICAGO ----------
Do Campo, M., Ribeiro Guevara, S. "Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina" . Journal of South American Earth Sciences 19, no. 2 (2005) : 143-153.
http://dx.doi.org/10.1016/j.jsames.2005.01.003
---------- MLA ----------
Do Campo, M., Ribeiro Guevara, S. "Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina" . Journal of South American Earth Sciences, vol. 19, no. 2, 2005, pp. 143-153.
http://dx.doi.org/10.1016/j.jsames.2005.01.003
---------- VANCOUVER ----------
Do Campo, M., Ribeiro Guevara, S. Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina. J. South Am. Earth Sci. 2005;19(2):143-153.
http://dx.doi.org/10.1016/j.jsames.2005.01.003