Detrital Quartz and Zircon Combined: The Production of Mature Sand with Short Transportation Paths Along the Cambrian West Gondwana Margin, Northwestern Argentina

Augustsson, Carita; Rüsing, Tobias; Adams, Christopher; Chmiel, Hannah E.; Kocabayoǧlu, Mert; Büld, Mareike; Zimmermann, Udo; Berndt, Jasper; Kooijman, Ellen

doi:10.2110/jsr.2011.23

Cited by 53 publications

(45 citation statements)

References 60 publications

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“…The slight 'shoulder' at the younger end of the pattern is due to three grains dated at 480-500 Ma, but we do not think these are sufficiently robust to indicate Ordovician deposition as claimed by Chernicoff et al (2013); a Late Cambrian age still seems probable. The provenance is not however diagnostic for the location of the sedimentary basin, as these three orogenies (in varying degrees) are the main contributors to Middle-to-Late Cambrian sediments in the Sierras Pampeanas (Steenken et al 2011;Augustssohn et al 2011) and the upper Byrd Group of the Transantarctic Mountains (Goodge et al 2004). …”

Section: Sediment Depositionmentioning

confidence: 99%

The Gondwana connections of northern Patagonia

Pankhurst

Rapela

Luchi

et al. 2014

JGS

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A multidisciplinary study (U-Pb SHRIMP geochronology, Hf and O isotopes in zircon, Sr and Nd isotopes in whole-rocks, as well as major and trace element geochemistry) has been carried out on granitoid samples from the area west of Valcheta, North Patagonian Massif, Argentina. These confirm the Cambrian age of the Tardugno Granodiorite (528 ± 4 Ma) and the Late Permian age of granites in the central part of the Yaminué complex (250 Ma). Together with petrological and structural information for the area, we consider a previously suggested idea that the Cambrian and Ordovician granites of northeastern Patagonia represent continuation of the Pampean and Famatinian orogenic belts of the Sierras Pampeanas, respectively. Our interpretation does not support the hypothesis that Patagonia was accreted in Late Palaeozoic times as a far-travelled terrane, originating in the Central Transantarctic Mountains, and the arguments for and against this idea are reviewed. A parautochthonous origin is preferred with no major ocean closure between the North Patagonian Massif and the Sierra de la Ventana fold belt.Supplementary material: [U-Pb SHRIMP Analytical Data, Geochemical Analyses and Sample GPS locations] is available at ww.geolsoc.org.uk/SUP00000 3 The hypothesis that Patagonia originated as a far-travelled terrane that became accreted to the rest of South America in Late Palaeozoic times (Ramos 1984) has proved remarkably resilient. It proposes collision of a Patagonian terrane with the rest of South America along a hypothetical suture now buried beneath the Río Colorado basin (Fig. 1), causing NEvergent deformation in the Palaeozoic sedimentary succession of the Sierra de la Ventana (Sierras Australes) and SW-vergent thrusting in northern Patagonia (von Gosen 2003 and references therein). Nevertheless, despite years of further investigation, relevant evidence is still scarce and sometimes inconclusive. Whereas some geophysical surveys have been claimed to show a major crustal discontinuity along the proposed suture zone (e.g., Chernicoff & Zappettini 2004), others have emphasized the complexity of the underlying block structure and the importance of east-west displacements, but do not indicate an overall difference in gravimetric signature across the boundary (Kostadinoff et al. 2005;Gregori et al. 2008). Palaeomagnetic data permit, but do not require, a small separation of the landmasses on either side in Devonian times (Rapalini 2005). Other authors have argued that Patagonia was an autochthonous part of South America (e.g., Varela et al. 1991; Dalla Salda et al. 1992). Rapela & Pankhurst (2002) and Pankhurst et al. (2003) supported the idea that the Early Palaeozoic Pampean and Famatinian magmatic belts of the Sierras Pampeanas might be traced continuously into the basement of the Sierra de la Ventana and northeastern Patagonia, respectively. Pankhurst et al. (2006) emphasized the idea that the North Patagonian Massif at least was an autochthonous part of South America, with a Carboniferous collision zone farth...

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Section: Sediment Depositionmentioning

confidence: 99%

The Gondwana connections of northern Patagonia

Pankhurst

Rapela

Luchi

et al. 2014

JGS

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“…Inherited U-Pb detrital zircon age patterns of the Meson Group imply a relative short sedimentary history with an imprecise maximum depositional age of ca. 500 Ma (Adams et al, 2008 or more probably 515-520 Ma (Augustsson et al, 2011;Fig. 4).…”

mentioning

confidence: 99%

Identifying Laurentian and SW Gondwana sources in the Neoproterozoic to Early Paleozoic metasedimentary rocks of the Sierras Pampeanas: Paleogeographic and tectonic implications

et al. 2016

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“…The Mesón Group, of middle to upper Cambrian age (Moya, 2008;Astini, 2008;Augustsson et al, 2011), rests discordantly on the Puncoviscana Formation at several places along the Eastern Cordillera (Turner and Mon, 1979), which brackets the deformation of the Puncoviscana-type units to the upper early Cambrian -middle Cambrian. Ages of metamorphism by fine mica dating (Adams et al, 2008) and from granites intruding the Puncoviscana Formation at different sections of the Eastern Cordillera (Hongn et al, 2010;Hauser et al, 2011) Back-arc extension is frequently though as a side effect of subduction which is explained by three main driven mechanisms, referred to as the anchored slab model (Uyeda and Kanamori, 1979), the slab pull model (Chapple and Tullis, 1977) and the corner flow model (Sleep and Toksöz, 1971).…”

Section: Discussionmentioning

confidence: 99%

“…The Puncoviscana Formation encompasses a thick and complex metaturbiditic sequence whose Neoproterozoic to Early Cambrian age is constrained by trace fossils, ages from detrital zircons and volcanic intercalations, and by the Early Cambrian intrusion of the Cañaní and Santa Rosa de Tastil granite batholiths (Bachman et al, 1987;Aceñolaza and Toselli, 2009;Hongn et al, 2010;Adams et al, 2011;Augustsson et al, 2011;Escayola et al, 2011). The study of the Puncoviscana Formation has fostered conflicting interpretations concerning the tectonic setting prevailing during its formation (Keppie and Bahlburg, 1999).…”

Section: Regional Settingmentioning

confidence: 99%

The Sierra de Cachi (Salta, NW Argentina): geological evidence about a Famatinian retro-arc at mid crustal levels

Hongn¹,

Tubía²,

Esteban³

et al. 2014

Journal of Iberian Geology

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The Cachi mountain ranges, located in Salta (NW Argentina), form an inlier where Neoproterozoic and Paleozoic materials of the Andes crop out in a plutono-metamorphic dome surrounded by Mesozoic and Cenozoic sedimentary rocks. The pre-Mesozoic rocks record a regional metamorphism of low pressure and high temperature conditions, which reached partial melting conditions and was coeval with the intrusion of sheeted granite and trondhjemite plutons. The metamorphic evolution and the emplacement of the plutons took place in an extensional tectonic setting. New U-Pb zircon dating by TIMS and SHRIMP methods yields similar ages for the migmatization (479.7 ± 3.5 Ma) and the emplacement of granites (472.1 ± 11 Ma), constraining the extensional event to Early Ordovician times. We also report the finding of gabbro boulders, which also yield a similar U-Pb SHRIMP zircon age of 477.5 ± 3.9 Ma. So, we propose that the extensional event recognized in Sierra de Cachi took place in a retro-arc setting linked to the Famatinian subduction along the western border of Gondwana. The shortening produced by younger east-verging folds evidences the superposition of a compressional stress field, probably related with the Ocloyic orogeny (Middle/Late Ordovician-Devonian).Keywords: U-Pb geochronology, Famatinian retro-arc, Cachi ranges, Argentina Resumen En la Sierra de Cachi, situada en Salta (NO de Argentina), afloran rocas neoproterozoicas y paleozoicas de los Andes en un domo plutono-metamórfico flanqueado por rocas sedimentarias mesozoicas y cenozoicas. Estas rocas registran un metamorfismo de alta temperatura y baja presión, que alcanzó condiciones de fusión parcial y fue coetáneo del emplazamiento de plutones de granitos y trondhjemitas. El metamorfismo y el emplazamiento de los plutones se produjo en condiciones extensionales. Nuevos análisis de U-Pb en zircones, por los métodos TIMS y SHRIMP, proporcionan edades similares para la migmatización (479,7 ± 3,5 Ma) y el emplazamiento de los granitos (472,1 ± 11 Ma), acotando el evento extensional al Ordovícico Inferior. También describimos el hallazgo de bloques de gabros que dan una edad U-Pb SHRIMP en circones semejante, de 477,5 ± 3,9 Ma. Por lo tanto, se propone que el evento extensional descrito en la Sierra de Cachi tuvo lugar en una zona de retro-arco asociada a la subducción famatiniana del borde occidental de Gondwana. El acortamiento producido por los pliegues más jóvenes vergentes al E refleja la superposición de un campo de esfuerzos compresivos, probablemente relacionados con la orogenia Oclóyica (Ordovícico Medio/Superior-Devónico).Palabras clave: geocronología U-Pb, retro-arco famatiniano, Sierra de Cachi, Argentina

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Detrital Quartz and Zircon Combined: The Production of Mature Sand with Short Transportation Paths Along the Cambrian West Gondwana Margin, Northwestern Argentina

Cited by 53 publications

References 60 publications

The Gondwana connections of northern Patagonia

The Gondwana connections of northern Patagonia

Identifying Laurentian and SW Gondwana sources in the Neoproterozoic to Early Paleozoic metasedimentary rocks of the Sierras Pampeanas: Paleogeographic and tectonic implications

The Sierra de Cachi (Salta, NW Argentina): geological evidence about a Famatinian retro-arc at mid crustal levels

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