Artículo

Steenken, A.; López de Luchi, M.G.; Dopico, C.M.; Drobe, M.; Wemmer, K.; Siegesmund, S. "The Neoproterozoic-early Paleozoic metamorphic and magmatic evolution of the Eastern Sierras Pampeanas: An overview" (2011) International Journal of Earth Sciences. 100(2):465-488
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Abstract:

The Eastern Sierras Pampeanas were structured by three main events: the Ediacaran to early Cambrian (580-510 Ma) Pampean, the late Cambrian-Ordovician (500-440 Ma) Famatinian and the Devonian-Carboniferous (400-350 Ma) Achalian orogenies. Geochronological and Sm-Nd isotopic evidence combined with petrological and structural features allow to speculate for a major rift event (Ediacaran) dividing into two Mesoproterozoic major crustal blocks (source of the Grenvillian age peaks in the metaclastic rocks). This event would be coeval with the development of arc magmatism along the eastern margin of the eastern block. Closure of this eastern margin led to a Cambrian active margin (Sierra Norte arc) along the western margin of the eastern block in which magmatism reworked the same crustal block. Consumption of a ridge segment (input of OIB signature mafic magmas) which controlled granulite-facies metamorphism led to a final collision (Pampean orogeny) with the western Mesoprotrozoic block. Sm-Nd results for the metamorphic basement suggest that the TDM age interval of 1.8-1.7 Ga, which is associated with the less radiogenic values of εNd(540) (-6 to -8), can be considered as the mean average crustal composition for the Eastern Sierras Pampeanas. Increasing metamorphic grade in rocks with similar detrital sources and metamorphic ages like in the Sierras de Córdoba is associated with a younger TDM age and a more positive εNd(540) value. Pampean pre-540 Ma granitoids form two clusters, one with TDM ages between 2.0 and 1.75 Ga and another between 1.6 and 1.5 Ga. Pampean post-540 Ma granitoids exhibit more homogenous TDM ages ranging from 2.0 to 1.75 Ga. Ordovician re-activation of active margin along the western part of the block that collided in the Cambrian led to arc magmatism (Famatinian orogeny) and related ensialic back-arc basin in which high-grade metamorphism is related to mid-crustal felsic plutonism and mafic magmatism with significant contamination of continental crust. TDM values for the Ordovician Famatinian granitoids define a main interval of 1.8-1.6, except for the Ordovician TTG suites of the Sierras de Córdoba, which show younger TDM ages ranging from 1.3 to 1.0 Ga. In Devonian times (Achalian orogeny), a new subduction regime installed west of the Eastern Sierras Pampeanas. Devonian magmatism in the Sierras exhibit process of mixing/assimilation of depleted mantle signature melts and continental crust. Achalian magmatism exhibits more radiogenic εNd(540) values that range between 0.5 and -4 and TDM ages younger than 1.3 Ga. In pre-Devonian times, crustal reworking is dominant, whereas processes during Devonian times involved different geochemical and isotopic signatures that reflect a major input of juvenile magmatism. © 2010 Springer-Verlag.

Registro:

Documento: Artículo
Título:The Neoproterozoic-early Paleozoic metamorphic and magmatic evolution of the Eastern Sierras Pampeanas: An overview
Autor:Steenken, A.; López de Luchi, M.G.; Dopico, C.M.; Drobe, M.; Wemmer, K.; Siegesmund, S.
Filiación:Geologisches und Geographisches Institut, Universität Greifswald, Friedrich-Ludwig-Jahn Strasse 17a, 17489 Greifswald, Germany
Instituto de Geocronología y Geología Isotópica (INGEIS), CONICET-Universidad de Buenos Aires, Pabellón INGEIS, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Geoscience Centre of the University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany
Palabras clave:Eastern Sierras Pampeanas; Magmatism-metamorphism; Neoproterozoic-early Paleozoic orogenies; Sm-Nd systematics; Tectonic evolution; active margin; age determination; continental crust; crustal structure; Devonian; geochronology; isotopic analysis; magmatism; metamorphic rock; metamorphism; Ordovician; Paleozoic; Proterozoic; samarium-neodymium dating; tectonic evolution; Argentina; Sierras Pampeanas
Año:2011
Volumen:100
Número:2
Página de inicio:465
Página de fin:488
DOI: http://dx.doi.org/10.1007/s00531-010-0624-0
Título revista:International Journal of Earth Sciences
Título revista abreviado:Int. J. Earth Sci.
ISSN:14373254
CODEN:IJESF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14373254_v100_n2_p465_Steenken

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Citas:

---------- APA ----------
Steenken, A., López de Luchi, M.G., Dopico, C.M., Drobe, M., Wemmer, K. & Siegesmund, S. (2011) . The Neoproterozoic-early Paleozoic metamorphic and magmatic evolution of the Eastern Sierras Pampeanas: An overview. International Journal of Earth Sciences, 100(2), 465-488.
http://dx.doi.org/10.1007/s00531-010-0624-0
---------- CHICAGO ----------
Steenken, A., López de Luchi, M.G., Dopico, C.M., Drobe, M., Wemmer, K., Siegesmund, S. "The Neoproterozoic-early Paleozoic metamorphic and magmatic evolution of the Eastern Sierras Pampeanas: An overview" . International Journal of Earth Sciences 100, no. 2 (2011) : 465-488.
http://dx.doi.org/10.1007/s00531-010-0624-0
---------- MLA ----------
Steenken, A., López de Luchi, M.G., Dopico, C.M., Drobe, M., Wemmer, K., Siegesmund, S. "The Neoproterozoic-early Paleozoic metamorphic and magmatic evolution of the Eastern Sierras Pampeanas: An overview" . International Journal of Earth Sciences, vol. 100, no. 2, 2011, pp. 465-488.
http://dx.doi.org/10.1007/s00531-010-0624-0
---------- VANCOUVER ----------
Steenken, A., López de Luchi, M.G., Dopico, C.M., Drobe, M., Wemmer, K., Siegesmund, S. The Neoproterozoic-early Paleozoic metamorphic and magmatic evolution of the Eastern Sierras Pampeanas: An overview. Int. J. Earth Sci. 2011;100(2):465-488.
http://dx.doi.org/10.1007/s00531-010-0624-0