Preandean geological configuration of the eastern North Patagonian Massif, Argentina

Gregori, Daniel Alfredo; Kostadinoff, José; Alvarez, Guillermina; Raniolo, A.; Strazzere, Leonardo; Martínez, Juan C. Garro; Barros, Mercedes Virginia

doi:10.1016/j.gsf.2013.01.001

Cited by 19 publications

(20 citation statements)

References 19 publications

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“…The final assembly of South America with Patagonia is not well constrained, but there is some consensus about its para‐autochthonous character and either its final amalgamation (Ramos, , ; Rapalini, ; Pankhurst et al ., ; Rapalini et al ., ) or intense intraplate deformation (Gregori et al ., , ) in early Permian time. Gondwanan‐Patagonian basement (AP and NPM; Fig.…”

Section: Geological Historymentioning

confidence: 99%

Basin evolution of Upper Cretaceous–Lower Cenozoic strata in the Malargüe fold‐and‐thrust belt: northern Neuquén Basin, Argentina

Balgord

Carrapa

2015

Basin Research

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The Andean Orogen is the type-example of an active Cordilleran style margin with a long-lived retroarc fold-and-thrust belt and foreland basin. Timing of initial shortening and foreland basin development in Argentina is diachronous along strike, with ages varying by 20-30 million years. The Neuquén Basin (32° S to 40° S) contains a thick sedimentary sequence ranging in age from late Triassic to Cenozoic, which preserves a record of rift, back arc, and foreland basin environments. Since much of the primary evidence for initial uplift has been Accepted ArticleThis article is protected by copyright. All rights reserved. overprinted or covered by younger shortening and volcanic activity, basin strata provide the most complete record of early mountain building. Detailed sedimentology and new maximum depositional ages obtained from detrital zircon U-Pb analyses from the Malargüe fold-and-thrust-belt (35˚ S) record a facies change between the marine evaporites of the Huitrín Formation (~122 Ma) and the fluvial sandstones and conglomerates of the Diamante Formation (~95 Ma). A 25-30 million year unconformity between the Huitrín and Diamante formations represents the transition from post-rift thermal subsidence to forebulge erosion during initial flexural loading related to crustal shortening and uplift along the magmatic arc to the west by at least 97 ± 2 Ma. This change in basin style is not marked by any significant difference in provenance and detrital zircon signature. A distinct change in detrital zircons, sandstone composition, and paleocurrent direction from west directed to east directed occurs instead in the middle Diamante Formation and may reflect the Late Cretaceous transition from forebulge derived sediment in the distal foredeep to proximal foredeep material derived from the thrust belt to the west. This change in paleoflow represents the migration of the forebulge, and therefore, the foreland basin system between 80 and 90 Ma in the Malargüe area.

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Section: Geological Historymentioning

confidence: 99%

Basin evolution of Upper Cretaceous–Lower Cenozoic strata in the Malargüe fold‐and‐thrust belt: northern Neuquén Basin, Argentina

Balgord

Carrapa

2015

Basin Research

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“…The Famatinian cycle comprises igneous rocks of Ordovician age characterized by granitoids of the Plutonic Complex Punta Sierra, including the Arroyo Salado Granodiorite, Hiparsa Granite and Punta Sierra Granite (Gregori et al 2013). In angular discordance over these rocks and those of the Pampean cycle lie the sedimentary rocks of the Early Devonian-Silurian Sierra Grande Formation characterized by the abundance of sandstones, which occur in sequences alternated with pelites and, subordinate, quartzites.…”

Section: G E O L O G I C a L S E T T I N Gmentioning

confidence: 99%

“…A secondary faulting is recognized, represented by thrust faults, generally E-W oriented although it is also NW-SW oriented. It is considered that the rocks of the Sierra Grande Formation were affected by the Famatinian and Gondwanic deformation (Gregori et al 2013). The Patagonian rocks present tilts due to the first phases of the Andean Orogeny, whereas the deposits of the Upper Tertiary are not affected.…”

Section: Geological Structuresmentioning

confidence: 99%

“…Previous geophysical investigations determined a series of negative gravity anomalies that were interpreted as a succession of Paleozoic basins parallel to the Patagonian coast as a result of a probable Permian–Triassic extension (Gregori et al . ; Gregori et al . ).…”

Section: Introductionmentioning

confidence: 99%

“…In this region there are outcrops of the Sierra Grande Formation containing important economic iron ore deposits. Previous geophysical investigations determined a series of negative gravity anomalies that were interpreted as a succession of Paleozoic basins parallel to the Patagonian coast as a result of a probable Permian-Triassic extension (Gregori et al 2013;Gregori et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Exploration of Iron ore deposits in Patagonia. Insights from gravity, magnetic and SP modelling

Christiansen

Kostadinoff

Bouhier

et al. 2018

Geophysical Prospecting

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The Sierra Grande region in northern Patagonia is considered the largest iron ore reserve in Argentina; however, the extension of the non‐outcropping deposits as well as the depth of the basins that contain them remains unknown. Utilizing 3D litho‐constrained inversion of gravity and magnetic data, we delimited an area with good prospects for iron ore deposits. In this region, high‐resolution magnetic and self‐potential profiles were acquired over the most important anomalies. Correlating both methodologies, it was possible to specify the possible existence of iron oxides (martite–hematite) in the form of 2D inclined sheets.

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Climatic, Tectonic, Eustatic, and Volcanic Controls on the Stratigraphic Record of Península Valdés

Bilmes

D’Elía

Cuitiño

et al. 2017

Late Cenozoic of Península Valdés, Patagonia, Argentina

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Preandean geological configuration of the eastern North Patagonian Massif, Argentina

Cited by 19 publications

References 19 publications

Basin evolution of Upper Cretaceous–Lower Cenozoic strata in the Malargüe fold‐and‐thrust belt: northern Neuquén Basin, Argentina

Basin evolution of Upper Cretaceous–Lower Cenozoic strata in the Malargüe fold‐and‐thrust belt: northern Neuquén Basin, Argentina

Exploration of Iron ore deposits in Patagonia. Insights from gravity, magnetic and SP modelling

Climatic, Tectonic, Eustatic, and Volcanic Controls on the Stratigraphic Record of Península Valdés

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