Sedimentary record of regional deformation and dynamics of the thick-skinned southern Puna Plateau, central Andes (26–27°S)

Zhou, Renjie; Schoenbohm, Lindsay M.; Sobel, Edward R.; Carrapa, Bárbara; Davis, Donald W.

doi:10.1016/j.epsl.2015.11.012

Cited by 19 publications

(26 citation statements)

References 43 publications

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“…Deformation between ~50 and ~40 Ma has been traditionally interpreted as responsible for the construction of the central Andes between ~26° and 23°S (e.g., Bascuñan et al, ; Carrapa & DeCelles, ; Charrier et al, ; Mpodozis et al, ). Evidence for shortening during middle Eocene time is widely recognized in the central Andes (e.g., Coutand et al, ; DeCelles et al, ; Ege et al, ; Eichelberger et al, ; Horton, ; Horton et al, ; Oncken et al, ; Zhou et al, ). Geochemical and isotopic signatures suggest that the magmatic arc was forming in a progressively thicker crust (from ~40 km at 50 Ma to ~50 km at 40 Ma; Haschke et al, , 2006; Profeta et al, ).…”

Section: Discussion: Implications For the Behavior Of The Orogenic Wedgementioning

confidence: 99%

Cretaceous to Middle Cenozoic Exhumation History of the Cordillera de Domeyko and Salar de Atacama Basin, Northern Chile

2019

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Spatiotemporal patterns of deformation and exhumation in the central Andes are key parameters for reconstructing the kinematic history of the orogenic belt. Previous studies of the retroarc thrust belt document overall eastward propagation of deformation since the late Eocene, but the amount and timing of exhumation during the early phase of Andean orogeny remains largely unconstrained, particularly in the modern forearc region. In order to determine the timing and amount of exhumation prior to the late Eocene, we employed a multidating approach combining zircon U-Pb geochronology with apatite fission track and apatite (U-Th)/He thermochronology. We focus on the low-temperature cooling history of the Cordillera de Domeyko thrust belt and synorogenic deposits in the Salar de Atacama basin. Our results show Late Cretaceous to Oligocene cooling and exhumation in the Cordillera de Domeyko. The distribution of cooling ages in the forearc indicates three periods of exhumation:~86-65,~65-50, and 50-28 Ma. The amount of cooling was variable in space and time but requires total exhumation of~2.5-3.3 km of rocks above major structures in the thrust belt. Regional unconformities in the Salar de Atacama basin correlate with periods of eastward migration of the orogenic front at~65 Ma and~50-40 Ma. Pulses of deformation at the front of the thrust belt alternated with periods of out-of-sequence hinterland deformation and exhumation. Overall, our data show that shortening in the central Andes commenced during the Late Cretaceous (as early as~86 Ma) and that deformation (shortening) and exhumation were coupled in space and time.

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Section: Discussion: Implications For the Behavior Of The Orogenic Wedgementioning

confidence: 99%

Cretaceous to Middle Cenozoic Exhumation History of the Cordillera de Domeyko and Salar de Atacama Basin, Northern Chile

2019

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“…2) está constituido por rocas metamórficas de mediano a alto grado del Precámbrico-Paleozoico inferior intruidas por granitoides y cuerpos menores máficos a ultramáficos paleozoicos (e.g., Becchio et al, 1999;Seggiaro et al, 2006;Lucassen y Becchio, 2003;Suzaño et al, 2014). Sobre este basamento cristalino yacen sedimentos continentales de granulometría gruesa con niveles de paleosuelos intercalados, caracterizados por la ausencia de material volcánico en su composición y asignados al Eoceno superior-Oligoceno inferior (Zhou et al, 2013(Zhou et al, , 2016Zhou y Schoenbohm, 2015;Fig. 2).…”

Section: Geología De La Región De Pasto Venturaunclassified

“…2). Estos depósitos representan la sedimentación en un área marginal (forebulge) de una cuenca de antepaís continua a escala regional (Zhou et al, 2016). Sobreyacen a estos depósitos FIG.…”

Section: Geología De La Región De Pasto Venturaunclassified

“…11,7 y los 7,8 Ma se desarrolló la cuenca de Pasto Ventura, cuya secuencia sedimentaria está formada por potentes depósitos continentales (Fig. 2) de color pardo rosado a rojo, compuestos por conglomerados, areniscas, limolitas, arcilitas y niveles de tobas intercalados (Ruiz Huidobro, 1975;Montero López, 2009;Zhou et al, 2013Zhou et al, , 2016Zhou y Schoenbohm, 2015). Durante el Cuaternario se desarrolló una importante actividad volcánica monogenética de composición básica (Figs.…”

Section: Geología De La Región De Pasto Venturaunclassified

“…2). El evento compresivo mioceno superior seguido de extensión que se registra en la cuenca de Pasto Ventura ha sido interpretado como una deformación fuera de secuencia localizada, resultado de la delaminación de una "gota litosférica" de pequeñas dimensiones (Schoenbohm y Carrapa, 2015;Zhou y Schoenbohm, 2015;Zhou et al, 2016). Sin embargo, este evento compresivo ha sido reconocido en gran parte del extremo sur de la Puna Austral (e.g., Guzmán et al, 2014;Astini et al, 2018;Bustos et al, en prensa).…”

Section: Geología De La Región De Pasto Venturaunclassified

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Estilos eruptivos asociados al volcanismo monogenético máfico de la región de Pasto Ventura, Puna Austral, Argentina

Filipovich

Báez

Bustos

et al. 2019

andgeo

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One of the most outstanding features of the Southern Puna is the occurrence of a widespread monogenetic mafic volcanism during Neogene-Quaternary. Despite a number of published papers focusing on the petrogenesis of this back-arc volcanism, works aimed on its physical volcanology are scarce. This paper presents the characterization of the monogenetic mafic volcanism in the Pasto Ventura region, located in the southeast edge of the Southern Puna. The results show that in the Pasto Ventura region there is a low density of small-volume eruptive centers aligned with regional tectonic structures and a significant variability in eruptive styles (effusive, strombolian, hawaiian, violent strombolian and phreatomagmatic) and typology of volcanic structures (domes, scoria cones, maars and tuff rings). The first of these features is explained by a limited magma flow rate from the deep source and the use of favorable tectonic structures (oriented obliquely to the regional maximum compression direction) for the ascent of small volumes of magma through the upper crust. The variability of eruptive styles responds to the complex interaction of different endogenous and exogenous factors. The occurrence of effusive or explosive eruptions depends on the differences in magma ascent rates including periods of stagnation in the upper crust, which in turn control the efficiency of degassing and ultimately the occurrence of fragmentation. On the other hand, the more humid local climatic conditions (~150 mm/year), which are related to the geographical position of the Pasto Ventura region in the eastern edge of the Puna, favor the occurrence of phreatomagmatic activity. Phreatomagmatic activity also varies according to the topography, substrate typology and depth at which water-magma interaction occurs.

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Exhalative red-bed copper mineralization in travertine, Puna Plateau, northwest Argentina

Sillitoe¹,

Rodríguez²

2022

Miner Deposita

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Sedimentary record of regional deformation and dynamics of the thick-skinned southern Puna Plateau, central Andes (26–27°S)

Cited by 19 publications

References 43 publications

Cretaceous to Middle Cenozoic Exhumation History of the Cordillera de Domeyko and Salar de Atacama Basin, Northern Chile

Cretaceous to Middle Cenozoic Exhumation History of the Cordillera de Domeyko and Salar de Atacama Basin, Northern Chile

Estilos eruptivos asociados al volcanismo monogenético máfico de la región de Pasto Ventura, Puna Austral, Argentina

Exhalative red-bed copper mineralization in travertine, Puna Plateau, northwest Argentina

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