Combined U-Pb SHRIMP and Hf isotope study of the Late Paleozoic Yaminué Complex, Rio Negro Province, Argentina: Implications for the origin and evolution of the Patagonia composite terrane

Chernicoff, Carlos Jorge; Zappettini, Eduardo O.; Santos, João Orestes Schneider; McNaughton, Neal J.; Белоусова, Е. А.

doi:10.1016/j.gsf.2012.06.003

Cited by 61 publications

(74 citation statements)

References 48 publications

(80 reference statements)

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“…The results presented here, together with those of Pankhurst et al (2006), Chernicoff et al (2013) and Rapalini et al (2013), largely confirm and extend the Rb-Sr results of Pankhurst et al (1992) and the conventional U-Pb data of Varela et al (2005). They reveal a consistent picture of three main periods of Palaeozoic igneous activity in northern and northeastern Patagonia: Cambrian (530-520 Ma), Ordovician (480-465 Ma) and Permian (280-250 Ma).…”

Section: Ages Of Magmatism In Northern Patagoniasupporting

confidence: 89%

“…These results together with those of Chernicoff et al (2013) and Rapalini et al (2013) demonstrate that magmatism in the area was confined in age to c. 520-530 Ma (Cambrian), 470-480 Ma (Ordovician) and 250-280 Ma (Permian). The Early Cambrian age of the Tardugno Granodiorite is confirmed: the mean of our two ages and that of Rapalini et al (2013) is 528 ± 4 Ma.…”

Section: Val008supporting

confidence: 61%

Section: The Yaminué Complexmentioning

confidence: 99%

“…The present study was initially undertaken to re-collect and date samples from the same critical localities. Meanwhile, the first U-Pb SHRIMP ages on zircon to be carried out in this area have been published: Chernicoff et al (2013) obtained a new age of 261 ± 3 Ma for zircon from granite from the western part of the Yaminué complex, and Rapalini et al (2013) have reported an Ordovician age of 467 ± 7 Ma for the southernmost sector of the complex and a Cambrian age of 529 ± 4 Ma for the Tardugno Granodiorite. These widely differing ages emphasize the need for more comprehensive study incorporating geochronology, geochemistry and isotope data to characterize the evolution and nature of Yaminué/Tardugno magmatism, which we have attempted to address here.…”

Section: Magmatism Subduction and Collision In Northern Patagoniamentioning

confidence: 99%

“…The poorly exposed host rock is a biotite-muscovite schist/gneiss in the northern sector, whereas in the southern sector deformed granitoids are in assumed tectonic contact with marbles of unknown age. Chernicoff et al (2013) describe and date as post-Mississippian the depositional protolith of biotite schist from near Puesto Peynecura in the southern sector, which they consider to be syn-sedimentary with the marbles.The igneous rocks of the complex are mostly shallowly NE-dipping sheet-like bodies of foliated porphyritic biotite granodiorite-monzogranite (with scarce amphibole), and less common equigranular to porphyritic biotite tonalite. These are separated by subconcordant sheets of mostly tonalitic biotite orthogneiss, a fine-grained equigranular to porphyritic leucogranite and some pegmatite sills.…”

mentioning

confidence: 99%

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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: Ages Of Magmatism In Northern Patagoniasupporting

confidence: 89%

Section: Val008supporting

confidence: 61%

Section: The Yaminué Complexmentioning

confidence: 99%

Section: Magmatism Subduction and Collision In Northern Patagoniamentioning

confidence: 99%

mentioning

confidence: 99%

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The Gondwana connections of northern Patagonia

Pankhurst

Rapela

Luchi

et al. 2014

JGS

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Tectonic insight based on anisotropy of magnetic susceptibility and compaction studies in the Sierras Australes thrust and fold belt (southwest Gondwana boundary, Argentina)

2016

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The Sierras Australes fold and thrust belt (Buenos Aires Province, Argentina) was in the southwestern Gondwanaland margin during the Paleozoic. The Tunas Formation (Permian) is exposed along the eastern part of it and continues eastward beneath the Claromecó Basin. Anisotropy of magnetic susceptibility (AMS) and compaction studies are described and compared with previous paleomagnetic studies with the aim of determining direction and magnitude of the main stresses acting during the sedimentation of the Tunas Formation. The anisotropy ellipsoids are triaxial with oblate or prolate shapes, reflecting different stages of layer parallel shortening during the evolution of the basin. Kmax axes trend NW‐SE, parallel to the fold axes, while Kmin move from a horizontal (base) to a vertical orientation at the top of the succession, showing a change from a tectonic to almost a sedimentary fabric. The magnitude of anisotropy and compaction degree decreases toward the top of the succession. The AMS results are consistent with the outcrop structural observations and the compaction and paleomagnetic data. Regional pattern indicates a compression from the SW along this part of Gondwana, with a migration of the orogenic front and attenuation toward the NE in the foreland basin during the Upper Paleozoic. This deformation, locally assigned to the San Rafael noncollisional orogenic phase, is the result of the latitudinal movements toward the Equator of Gondwana (southern plates) and Laurentia (northern plates) during the Permian. This movement is the result of a rearrangement of the microplates that collided with Gondwana during the Late Devonian, to configure Pangea during the Triassic.

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