Dynamics of deformation and sedimentation in the northern Sierras Pampeanas: An integrated study of the Neogene Fiambala basin, NW Argentina: Reply

Carrapa, Bárbara; Hauer, J.; Schoenbohm, Lindsay M.; Strecker, Manfred R.; Schmitt, Axel K.; Villanueva, Arturo; Gomez, José

doi:10.1130/b30134.1

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…The major participation of basement in thrusting would have been likely around 14.5 Ma, slightly more recently than proposed by Dávila and Astini (2007), but significantly earlier than Carrapa et al (2010) hypothesis. This result is consistent with earlier development of shallow subduction and basement partitioning at these latitudes.…”

Section: Discussionmentioning

confidence: 87%

“…(Dávila and Astini 2003c). This new constraint allows confirmation that an early shallow-subduction regime developed along the southern Central Andes (Dávila et al 2004;Dávila and Astini 2007), contributing to the discussion on the timing of the foreland partitioning and arrival of flat slabs in Argentina [EarlyMiddle Miocene (Dávila 2010) versus latest Miocene to Pliocene (Carrapa et al 2010)]. …”

Section: Normalized Intensitymentioning

confidence: 83%

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Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: basement partitioning and minor block rotation in Argentine broken foreland

Zambrano

Rapalini

Dávila

et al. 2010

Int J Earth Sci (Geol Rundsch)

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Magnetostratigraphic and paleomagnetic studies on early Andean synorogenic strata (Del Crestón Fm.), in the Famatina Belt (28.7°S, 67.5°W) clarify details of chronology that permit calculation of sedimentation rates within the broken foreland of west Argentina. The Del Crestón Fm represents the first record of broken foreland sedimentation within the southern Central Andean belt and the earliest retroarc volcanic rocks exposed several hundred kilometers from the trench. Twenty-five out of 49 sites collected along the succession presented a primary remanence, as determined through positive fold and reversal tests. Correlation of the local magnetic polarity section with the global polarity time scale indicates that the sedimentation of Del Crestón Fm started at *16.7 Ma and continued until *14.5 Ma. The youngest strata are represented by conglomerates bearing abundant Lower Paleozoic granite boulders indicating unroofing of the crystalline basement within the NW Sierras Pampeanas. This result supports the hypothesis of an early broken foreland stage at these latitudes of the Andes, with involvement of the basement in deformation and coeval retroarc volcanism, common attributes of flat-subduction regimes. A mean site paleomagnetic direction of Dec: 6.3°, Inc: -43.6°(a95: 8.0°, N = 24) confirm our earlier intrepretation that the central part of the Famatina Belt within the Sierras Pampeanas did not undergo large vertical axes rotations since the Middle Miocene.

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Section: Discussionmentioning

confidence: 87%

Section: Normalized Intensitymentioning

confidence: 83%

Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: basement partitioning and minor block rotation in Argentine broken foreland

Zambrano

Rapalini

Dávila

et al. 2010

Int J Earth Sci (Geol Rundsch)

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“…The Neogene accumulation would have been associated, to the west, with loading by the basement thrust system of the Famatina belt (Dávila & Astini, ; Carrapa et al ., ; Davila, ). However, given that the tectonic shortening along the Famatina and related ranges is low (<20%; Dávila, ), whereas the depocenters are thick and extend several hundred kilometres away from the topographic loads, Dávila et al .…”

Section: Discussionmentioning

confidence: 99%

“…The Neogene accumulation would have been associated, to the west, with loading by the basement thrust system of the Famatina belt (Dávila & Astini, 2007;Carrapa et al, 2010;Davila, 2010). However, given that the tectonic shortening along the Famatina and related ranges is low (<20%; Dávila, 2003), whereas the depocenters are thick and extend several hundred kilometres away from the topographic loads, Dávila et al (2005Dávila et al ( , 2007Dávila et al ( , 2010 concluded that sublithospheric forces might have accompanied the flexural subsidence to accommodate the entire sedimentary filling.…”

Section: Discussionmentioning

confidence: 99%

The evolution of the high‐elevated depocenters of the northern Sierras Pampeanas (ca. 28˚ SL), Argentine broken foreland, South‐Central Andes: the Pipanaco Basin

Dávila

Giménez²,

Nóbile

et al. 2012

Basin Research

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The Pipanaco Basin, in the southern margin of the Andean Puna plateau at ca. 28°SL, is one of the largest and highest intermontane basins within the northernmost Argentine broken foreland. With a surface elevation >1000 m above sea level, this basin represents a strategic location to understand the subsidence and subsequent uplift history of high‐elevation depositional surfaces within the distal Andean foreland. However, the stratigraphic record of the Pipanaco Basin is almost entirely within the subsurface, and no geophysical surveys have been conducted in the region. A high‐resolution gravity study has been designed to understand the subsurface basin geometry. This study, together with stratigraphic correlations and flexural and backstripping analysis, suggests that the region was dominated by a regional subsidence episode of ca. 2 km during the Miocene‐Pliocene, followed by basement thrusting and ca. 1–1.5 km of sediment filling within restricted intermontane basin between the Pliocene‐Pleistocene. Based on the present‐day position of the basement top as well as the Neogene‐Present sediment thicknesses across the Sierras Pampeanas, which show slight variations along strike, sediment aggradation is not the most suitable process to account for the increase in the topographic level of the high‐elevation, close‐drainage basins of Argentina. The close correlation between the depth to basement and the mean surface elevations recorded in different swaths indicates that deep‐seated geodynamic process affected the northern Sierras Pampeanas. Seismic tomography, as well as a preliminary comparison between the isostatic and seismic Moho, suggests a buoyant lithosphere beneath the northern Sierras Pampeanas, which might have driven the long‐wavelength rise of this part of the broken foreland after the major phase of deposition in these Andean basins.

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The geological and structural evolution of the long-lived Miocene-Pleistocene La Hoyada Volcanic Complex in the geodynamic framework of the Central Andes, Argentina

Bustos

Báez

Norini

et al. 2019

Journal of Volcanology and Geothermal Research

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Dynamics of deformation and sedimentation in the northern Sierras Pampeanas: An integrated study of the Neogene Fiambala basin, NW Argentina: Reply

Cited by 4 publications

References 16 publications

Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: basement partitioning and minor block rotation in Argentine broken foreland

Magnetostratigraphy and paleomagnetism of early and middle Miocene synorogenic strata: basement partitioning and minor block rotation in Argentine broken foreland

The evolution of the high‐elevated depocenters of the northern Sierras Pampeanas (ca. 28˚ SL), Argentine broken foreland, South‐Central Andes: the Pipanaco Basin

The geological and structural evolution of the long-lived Miocene-Pleistocene La Hoyada Volcanic Complex in the geodynamic framework of the Central Andes, Argentina

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