Paleozoic deformation in the Sierras de Cordoba and Sierra de Las Minas, eastern Sierras Pampeanas, Argentina

Simpson, Carol; Law, Richard D.; Gromet, L. Peter; Miró, Roberto César; Northrup, C.J.M.

doi:10.1016/s0895-9811(02)00130-x

Cited by 67 publications

(69 citation statements)

References 33 publications

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“…8). According to Simpson et al (2003), the M2 metamorphism is related to an Fig. 8 Schematic sketches depicting the tectonic evolution of the Sierras de Córdoba during the Brazilian-Pampean Cycle extensional event, i.e., the subduction of the ocean-ridge (see also Gromet et al 2005), whereas microstructures suggest a contractional D2 formation (Guereschi and Martino 2003).…”

Section: Discussionmentioning

confidence: 99%

Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)

Siegesmund

Steenken

Martino

et al. 2009

Int J Earth Sci (Geol Rundsch)

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The application of the SHRIMP U/Pb dating technique to zircon and monazite of different rock types of the Sierras de Córdoba provides an important insight into the metamorphic history of the basement domains. Additional constraints on the Pampean metamorphic episode were gained by Pb/Pb stepwise leaching (PbSL) experiments on two titanite and garnet separates. Results indicate that the metamorphic history recorded by Crd-free gneisses (M2) started in the latest Neoproterozoic/earliest Cambrian (553 and 543 Ma) followed by the M4 metamorphism at

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Section: Discussionmentioning

confidence: 99%

Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)

Siegesmund

Steenken

Martino

et al. 2009

Int J Earth Sci (Geol Rundsch)

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“…Widespread extensional features in the Famatinian back-arc have been described in several localities (Manheim 1993;Mangano and Buatois 1996;Esteban and Gutierrez-Marco 1997;Benedetto 1998;Esteban 1999;Esteban et al 1999;Bierlein et al 2006), suggesting significant crustal stretching including the possibility of oceanic crust generation (Sims et al 1998;Miller and Söllner 2005). The Late Ordovician to Early Silurian tectonic event (the ''Ocloyic phase'' of Mon and Salfity 1995) produced significant shortening (Astini and Dávila 2004), mainly through E-directed thrusts (Rapela et al 2001;Astini and Dávila 2004) and shear zones (Perez et al 1991;López and Toselli 1993;Sims et al 1998;Miller and Söllner 2005), metamorphism (Rapela et al 2001;Simpson et al 2003;Steenken et al 2004;Collo et al 2008) and demise of the arc related magmatism (Durand and López 1996;Rapela et al 1998Rapela et al , 2001Dahlquist et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Reinterpretation of the Ordovician rotations in NW Argentina and Northern Chile: a consequence of the Precordillera collision?

Spagnuolo

Rapalini²,

Astini

2010

Int J Earth Sci (Geol Rundsch)

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Early Paleozoic paleomagnetic data from NW Argentina and Northern Chile have shown large systematic rotations within two domains: one composed of the Western Puna that yields very large (up to 80°) counterclockwise rotations, and the other formed by the Famatina Ranges and the Eastern Puna that shows (*40°) clockwise rotations around vertical axes. In several locations, lack of significant rotations in younger rocks constrains this kinematic pattern to have occurred during the Paleozoic. Previous tectonic models have explained these rotations as indicative of rigid-body rotations of large para-autochthonous crustal blocks or terranes. A different but simple tectonic model that accounts for this pattern is presented in which rotations are associated to crustal shortening and tectonic escape due to the collision of the allochthonous terrane of Precordillera in the Late Ordovician. This collision should have generated dextral shear zones in the back arc region of the convergent SW Gondwana margin, where systematic domino-like clockwise rotations of small crustal blocks accommodate crustal shortening. The Western Puna block, bordering the Precordillera terrane to the north, might have rotated counterclockwise as an independent microplate due to tectonic escape processes, in a fashion similar to the present-day relationship between the Anatolia block and the Arabian microplate.

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“…feldspar or rock fragments) into clay minerals (pseudo matrix) can bias framework modes toward the quartz apices of classification diagrams (Do Campo and Ribeiro-Guevara, 2005). Furthermore, the geochemistry of metasediments is particularly valuable in the study of fine-grained rocks that are difficult to characterize through , and Simpson et al (2003). Inset shows the location of the research area in Argentina (boxed).…”

Section: Introductionmentioning

confidence: 99%

“…and higher-grade metasediments of the Sierras de Córdoba were intruded by the calc-alkaline 'Pampean' magmatic arc (or 'Tilcaric arc', Omarini et al, 1999) and the Sierra del Norte complex ( Figure 1a; Lira et al, 1997;Schwartz et al, 2008), respectively. The Pampean cycle ended with an episode of peraluminous magmatism, related to subduction of a midocean ridge under the Puncoviscana accretionary prism as the arc magmatism was coming to a close (Fantini et al, 1998;Simpson et al, 2003;Schwartz et al, 2008). Schwartz et al (2008) suggest that east-dipping subduction at ca.…”

Section: Introductionmentioning

confidence: 99%

“…In the Córdoba area, Pampean convergence ended with significant post-tectonic 515 -520 Ma S-type peraluminous plutonism (e.g. Rapela et al, 1998Rapela et al, , 2002Simpson et al, 2003) that has been interpreted as related to eastward subduction of a mid-ocean ridge (Sims et al, 1998;Gromet and Simpson, 1999;Siegesmund et al, 2010 and references therein). This subduction likely ended with the collision and accretion of Western Sierras Pampeanas (Rapela et al, 2007;Siegesmund et al, 2010 and references therein).…”

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confidence: 99%

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Provenance and tectonic setting of Neoproterozoic to Early Cambrian metasedimentary rocks from the Cordillera Oriental and Eastern Sierras Pampeanas, NW Argentina

Piñán-Llamas

Escamilla-Casas

2013

BSGM

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Major, trace, and rare-earth element data for the Neoproterozoic to early Cambrian Puncoviscana Formation and related highergrade metasedimentary rocks in Eastern Sierras Pampeanas, NW Argentina, were analyzed to evaluate their provenance, weathering, and tectonic setting during the upper Neoproterozoic-lower Paleozoic. The studied rocks are metapelites and metapsammites that were mainly affected by the lower Cambrian Pampean orogeny. Geochemical analyses indicate that the Puncoviscana Fm. and related rocks are characterized by moderate Chemical Index of Alteration (CIA) values. REE element distributions, Eu/Eu* values, and high Zr/Sc and Th/Sc ratios indicate that the samples were likely derived from predominantly upper-crust felsic sources. Tectonic discrimination diagrams based on immobile trace elements (e.g. Th-La-Sc, Sc-Th-Zr/10), multi-element patterns, REE characteristics, and diagnostic trace element ratios (i.e. Th/Sc, Zr/Hf, La/Th, La/Sc) imply that the tectonic setting of the source area was a continental island arc and/ or an active continental margin. Geochemical signatures of low-grade metapsammitic samples (high Hf and Zr content, and high Zr/ Sc ratios) indicate crustal recycling.The geometry and sequence of structures and microstructures preserved in all samples are pervasive and suggest a common and uniform deformational history during the Pampean orogeny. Geochemical signatures and structures of the studied samples are consistent with protolithic sediments of the Puncoviscana Fm. and related rocks initially deposited in an arc-related basin that was subsequently deformed during the Pampean orogeny.Keywords: Geochemistry, metasedimentary rocks, provenance, Pampean orogeny, Puncoviscana Formation. petrographic studies. Major and trace elements can constraint the effects of weathering and sedimentary sorting, while rare earth and certain trace elements (e.g. Th, Zr, Hf, Nb, and Sc) are considered particularly reliable in the discrimination of provenance and tectonic setting. This reliability is based on their low mobility during sedimentary processes, diagenesis, and metamorphism, thus reflecting the signature of the parent materials, and the composition and tectonic environment of the source (Taylor and McLennan, 1985;McLennan, 1989;McLennan et al., 1993;Roser et al., 1996;Condie, 1991Condie, , 1993. Provenance studies of medium and high metamorphic grade metasediments are relatively common in the literature (i.e. Li et al., 2005;Meinhold et al., 2007;Drobe et al., 2011; Verdecchia and Baldo, 2010). ResumenIn this paper, we present new major and trace element whole-rock geochemical analyses from the Puncoviscana Fm. and related metasedimentary rocks from Cumbres Calchaquies, Sierras de Quilmes, Ancasti, and Córdoba (Figure 1). We combine our results with previously published data Do Campo and RibeiroGuevara, 2005;Zimmermann, 2005) to evaluate their source and tectonic depositional setting. The characterization of the provenance and tectonic setting of these units is important for unde...

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Paleozoic deformation in the Sierras de Cordoba and Sierra de Las Minas, eastern Sierras Pampeanas, Argentina

Cited by 67 publications

References 33 publications

Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)

Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina)

Reinterpretation of the Ordovician rotations in NW Argentina and Northern Chile: a consequence of the Precordillera collision?

Provenance and tectonic setting of Neoproterozoic to Early Cambrian metasedimentary rocks from the Cordillera Oriental and Eastern Sierras Pampeanas, NW Argentina

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