Detrital zircon geochronology and provenance of the Chubut Group in the northeast of Patagonia, Argentina

Navarro, Edgardo; Astini, Ricardo A.; Белоусова, Е. А.; Guler, M. Verónica; Gehrels, George E.

doi:10.1016/j.jsames.2015.07.006

Cited by 17 publications

(9 citation statements)

References 27 publications

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“…7). The negative values are concentrated in the 120-90 Ma range, coincident with estimates for a late Early Cretaceous onset of shortening in northern Patagonia (Suaréz et al, 2009b(Suaréz et al, , 2010Navarro et al, 2015;Echaurren et al, 2016). The Cretaceous also marks the main phase of subduction-related arc magmatism in the North Patagonian Batholith (~135-80 Ma, Pankhurst et al, 1999;Suárez and del la Cruz, 2001).…”

Section: Accepted Manuscriptsupporting

confidence: 69%

“…In northern Patagonia, Jurassic to Lower Cretaceous deposits are uniformly derived from eastern sources in the North Patagonian Massif, principally from volcanic rocks of the Marifil Formation (Fig. 6), consistent with paleoflow from the east as determined by Navarro et al (2015). A Campanian-Maastrichtian switch to western orogenic sources is recognized in the Paso del Sapo Formation, with nearly exclusive derivation from the North Patagonian Batholith and associated pre-Andean basement (Fig.…”

Section: Reversal In Sediment Polaritymentioning

confidence: 59%

“…The nonmarine Lower Cretaceous Chubut Group comprises principally fluvial deposits with local volcaniclastic facies and is divided into the Los Adobes and Cerro Barcino Formations M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT (Marveggio and Llorens, 2013;Figari et al, 2015;Suárez et al, 2014;Navarro et al, 2015). A depositional hiatus separates the Chubut Group from the overlying marginal marine Upper Cretaceous-lower Paleogene Paso del Sapo and Lefipán Formations (Spalletti, 1996;Scasso et al, 2012).…”

Section: Retroarc Foreland Basinmentioning

confidence: 99%

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Cretaceous-Cenozoic growth of the Patagonian broken foreland basin, Argentina: Chronostratigraphic framework and provenance variations during transitions in Andean subduction dynamics

Butler

Horton

Echaurren

et al. 2020

Journal of South American Earth Sciences

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The Cretaceous-Cenozoic evolution of the Patagonian broken foreland basin system at 42-43°S in the northern Chubut province of Argentina is associated with variable retroarc phases of fold-thrust belt shortening, extension, and basement uplift during changes in the dynamics of oceanic slab subduction. Basement inheritance and progressive shallowing of an east-dipping subducting slab are important mechanisms of foreland partitioning, as dictated by the preexisting (pre-Andean) structural architecture and forelandward (eastward) advance of Late Cretaceous arc magmatism. Previously recognized growth strata help define the timing of fold-thrust belt shortening and retroarc basement-involved uplift, but the precise consequences for sediment routing remain poorly understood, with uncertainties in patterns of basin evolution before, during, and after shallowing and resteepening of the subducting slab. In this study, distinctive sediment source regions and magmatic histories enable evaluation of the stratigraphic and tectonic evolution of the retroarc foreland basin using new provenance results, maximum depositional ages, and isotopic signatures from detrital zircon U-Pb geochronology and Lu-Hf geochemical analyses. A compilation of published bedrock crystallization ages and distributions of metamorphic and igneous basement rocks identify: a western source region defined by the Andean magmatic arc and associated pre-Andean basement; and an eastern source region consisting of intraplate magmatic units and the North Patagonian Massif. We demonstrate that Aptian-Cenomanian retroarc basin fill was derived principally from the basement massif and intraplate volcanic units to the east, followed by a Late Cretaceous

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Section: Accepted Manuscriptsupporting

confidence: 69%

Section: Reversal In Sediment Polaritymentioning

confidence: 59%

Section: Retroarc Foreland Basinmentioning

confidence: 99%

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Cretaceous-Cenozoic growth of the Patagonian broken foreland basin, Argentina: Chronostratigraphic framework and provenance variations during transitions in Andean subduction dynamics

Butler

Horton

Echaurren

et al. 2020

Journal of South American Earth Sciences

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“…Jurassic sequences are uncomformably overlain by lacustrine, fluvial and volcaniclastic deposits of the late Early -Late Cretaceous Chubut Group, locally separated in Los Adobes and Cerro Barcino Formations (Codignotto et al, 1978) (Figure 2). Los Adobes Formation has a maximum U/Pb age of ~109 Ma (Navarro et al, 2015), while in the Deseado Massif to the south, equivalent facies yielded slightly older U/Pb ages of ~118-114 Ma (Césari et al, 2011;Pérez Loinaze et al, 2013).…”

Section: Figurementioning

confidence: 99%

Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata

et al. 2016

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The North Patagonian fold-thrust belt (41º-44º S) is characterized by a low topography, reduced crustal thickness and a broad lateral development determined by a broken foreland system in the retroarc zone. This particular structural system has not been fully addressed in terms of the age and mechanisms that built this orogenic segment. Here, new field and seismic evidence of syntectonic strata constrain the timing of the main deformational stages, evaluating the prevailing crustal regime for the different mountain domains through time. Growth strata and progressive unconformities, controlled by extensional or compressive structures, were recognized in volcanic and sedimentary rocks from the cordilleran to the extra-Andean domain. These data were used to construct a balanced cross section, whose deep structure was investigated through a thermomechanical model that characterizes the upper plate rheology. Our results indicate two main compressive stages, interrupted by an extensional relaxation period. The first contractional stage in the mid-Cretaceous inverted Jurassic-Lower Cretaceous half graben systems, reactivating the western Cañadón Asfalto rift border ~500 km away from the trench, at a time of arc foreland expansion. For this stage, available thermochronological data reveal forearc cooling episodes, and global tectonic reconstructions indicate mid ocean ridge collisions against the western edge of an upper plate with rapid trenchward displacement. Widespread synextensional volcanism is recognized throughout the Paleogene during plate reorganization; retroarc Paleocene-Eocene flare up activity is interpreted as product of a slab rollback, and fore-to-retroarc Oligocene slab/asthenospheric derived products as an expression of enhanced extension. The second stage of mountain growth occurred in Miocene time associated with Nazca Plate subduction, reaching nearly the same amplitude than the first compressive stage. Extensional weakening of the upper plate predating the described contractional stages appears as a necessary condition for abnormal lateral propagation of deformation.

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“…Crustal shortening and foreland basin sedimentation (Chubut and Divisadero Groups) commenced at ~110–90 Ma and persisted throughout Late Cretaceous‐Paleocene time (Barcat et al, ; Gianni et al, ; Navarro et al, ; Suárez et al, ). Contractional deformation was distributed over the entire retroarc segment of continental crust (including the San Bernardo fold‐thrust belt), due to possible crustal weakening by earlier extension and reactivation of associated normal faults (Gianni et al, ; Orts et al, ; Savignano et al, ).…”

Section: Southern Andes (43°s)mentioning

confidence: 99%

Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

2018

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Construction of the Andes has been governed largely by fluctuating contractional, neutral, and extensional tectonic regimes during differing degrees of mechanical coupling along the convergent plate boundary. These three contrasting regimes are likely regulated by geodynamic variations in absolute trenchward motion of South America and episodic regional shifts in the geometry of the subducting oceanic slab. Alternations among these three modes are revealed in syntheses of Mesozoic‐Cenozoic crustal deformation, basin evolution, and arc magmatism along orogen‐perpendicular transects across the central and southern Andes at 23°S, 35°S, and 43°S. Despite considerable along‐strike dissimilarities in the magnitude of deformation, a comparable tectonic regime typified the early Andean history, as defined by a transition from Late Jurassic‐Early Cretaceous postrift thermal subsidence to Late Cretaceous retroarc shortening. A key contradiction is expressed for the late middle Eocene to earliest Miocene, when neutral to extensional conditions affected retroarc to forearc regions, except in parts of the central Andes, which experienced retroarc shortening with only localized forearc extension. This mixed‐mode scenario during Paleogene time may reflect decoupling along the plate boundary (possibly during slab rollback within a retreating subduction system) in which widespread stasis or low‐magnitude extension dominated the southern Andes but was inhibited in the strongly shortened central Andes at 15–25°S where shallow subduction and/or high topography boosted plate coupling. Comparable temporal and spatial shifts in tectonic regime along the Andes and other convergent margins can be related to variable degrees of coupling during first‐order plate‐scale changes in convergence and second‐order regional cycles of slab shallowing and steepening.

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Detrital zircon geochronology and provenance of the Chubut Group in the northeast of Patagonia, Argentina

Cited by 17 publications

References 27 publications

Cretaceous-Cenozoic growth of the Patagonian broken foreland basin, Argentina: Chronostratigraphic framework and provenance variations during transitions in Andean subduction dynamics

Cretaceous-Cenozoic growth of the Patagonian broken foreland basin, Argentina: Chronostratigraphic framework and provenance variations during transitions in Andean subduction dynamics

Tectonic evolution of the North Patagonian Andes (41°–44° S) through recognition of syntectonic strata

Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

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