Tectonic and dynamic controls on the topography and subsidence of the Argentine Pampas: The role of the flat slab

Dávila, Federico M.; Lithgow‐Bertelloni, Carolina; Giménez, Mario

doi:10.1016/j.epsl.2010.03.039

Cited by 70 publications

(90 citation statements)

References 43 publications

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“…Thus, in flat-slab or more general amagmatic subduction, the subducted plate is coupled to the overlying plate by a cold mantle wedge, and so the negative buoyancy of the subducted plate can act as a load which will pull the overlying lithosphere down 0.5-1.5 km (Stern et al 1992;Kudo and Yamaoka 2003;Dávila et al 2010;Manea et al 2012). This is in contrast to subduction above a well-developed volcanic arc, where the mantle wedge consists of "hot" and low viscosity asthenosphere.…”

Section: Changes In Geometry Of the Subducted Slabmentioning

confidence: 87%

“…As discussed above, flat-slab subduction could provide an additional vertical load that would be enough to pull down the lithosphere beneath the Altiplano and Eastern Cordillera about 1 km in the Paleogene, as predicted by dynamical models of flat-slab subduction beneath relatively weak lithosphere ( Fig. 10; Dávila et al 2010).…”

Section: Subsidence During Flat Slab Subductionmentioning

confidence: 99%

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Cenozoic uplift of the Central Andes in northern Chile and Bolivia—reconciling paleoaltimetry with the geological evolution

Lamb

2016

Can. J. Earth Sci.

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Abstract:The Cenozoic geological evolution of the Central Andes, along two transects between ϳ17.5°S and 21°S, is compared with paleo-topography, determined from published paleo-altimetry studies. Surface and rock uplift are quantified using simple 2-D models of crustal shortening and thickening, together with estimates of sedimentation, erosion, and magmatic addition. Prior to ϳ25 Ma, during a phase of amagmatic flat-slab subduction, thick-skinned crustal shortening and thickening (nominal age of initiation ϳ40 Ma) was focused in the Eastern and Western Cordilleras, separated by a broad basin up to 300 km wide and close to sea level, which today comprises the high Altiplano. Surface topography at this time in the Altiplano and the western margin of the Eastern Cordillera appears to be ϳ1 km lower than anticipated from crustal thickening, which may be due to the pull-down effect of the subducted slab, coupled to the overlying lithosphere by a cold mantle wedge. Oligocene steepening of the subducted slab is indicated by the initiation of the volcanic arc at ϳ27-25 Ma, and widespread mafic volcanism in the Altiplano between 25 and 20 Ma. This may have resulted in detachment of mantle lithosphere and possibly dense lower crust, triggering 1-1.5 km of rapid uplift (over Ͻ Ͻ5 Myrs) of the Altiplano and western margin of the Eastern Cordillera and establishing the present day lithospheric structure beneath the high Andes. Since ϳ25 Ma, surface uplift has been the direct result of crustal shortening and thickening, locally modified by the effects of erosion, sedimentation, and magmatic addition from the mantle. The rate of crustal shortening and thickening varies with location and time, with two episodes of rapid shortening in the Altiplano, lasting <5 Myrs, that are superimposed on a long-term history of ductile shortening in the lower crust, driven by underthrusting of the Brazilian Shield on the eastern margin.

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Section: Changes In Geometry Of the Subducted Slabmentioning

confidence: 87%

Section: Subsidence During Flat Slab Subductionmentioning

confidence: 99%

Cenozoic uplift of the Central Andes in northern Chile and Bolivia—reconciling paleoaltimetry with the geological evolution

Lamb

2016

Can. J. Earth Sci.

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“…7) (Miller et al, 2005). This globally high sea-stand may correspond to a marine transgression of the Paranense Sea producing the Laguna Paiva Formation which reached the Andean foothills at 25°S (Dávila et al, 2010;Dávila and Lithgow-Bertelloni, 2013). This transgression must have served as a potent barrier to mammalian interchange.…”

Section: The Paraná Portal: Early Miocene Expansion and Middle Miocenmentioning

confidence: 99%

“…5A). The latter occurrences establish that the Atlantic forests had a greater species richness in the recent past, Base map is a composite of maps of Amazonia by Wesselingh et al (2010), the Early Miocene Paranense Sea by Dávila et al (2010Dávila et al ( , 2013 the Early Miocene Patagonian region by Malumián (1999) and Cuitiño and Scasso (2013). For the Caribbean and Central America, see (Pindell et al, 1988;Wadge and Burke, 1993;Iturralde-Vinent and MacPhee, 1999;Kirby et al, 2008;Pindell and Kennan, 2009).…”

Section: Crown Platyrrhinesmentioning

confidence: 99%

Biogeography in deep time – What do phylogenetics, geology, and paleoclimate tell us about early platyrrhine evolution?

Kay

2015

Molecular Phylogenetics and Evolution

111

170

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a b s t r a c tMolecular data have converged on a consensus about the genus-level phylogeny of extant platyrrhine monkeys, but for most extinct taxa and certainly for those older than the Pleistocene we must rely upon morphological evidence from fossils. This raises the question as to how well anatomical data mirror molecular phylogenies and how best to deal with discrepancies between the molecular and morphological data as we seek to extend our phylogenies to the placement of fossil taxa.Here I present parsimony-based phylogenetic analyses of extant and fossil platyrrhines based on an anatomical dataset of 399 dental characters and osteological features of the cranium and postcranium.

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“…3). Together with crustal deformation (Dávila et al, 2010;Dávila and Lithgow-Bertelloni, 2013) and lithospheric thickness 4 changes due to, for example delamination (Garzione et al, 2008), the dynamic uplift determines today's total topography (Fig. 3) as suggested by observed deficits and excesses in residual topography (Steinberger, 2007).…”

mentioning

confidence: 99%

Dynamic uplift during slab flattening

Dávila¹,

Lithgow‐Bertelloni²

2015

Earth and Planetary Science Letters

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Subduction exerts a strong control on surface topography and is the main cause of large vertical motions in continents, including past events of large-scale marine flooding and tilting. The mechanism is dynamic deflection: the sinking of dense subducted lithosphere gives rise to stresses that directly pull down the surface. Here we show that subduction does not always lead to downward deflections of the Earth's surface. Subduction of young lithosphere at shallow angles (flat subduction) leaves it neutrally or even positively buoyant with respect to underlying mantle because the lithosphere is relatively warm compared with older lithosphere, and because the thickened and hence drier oceanic crust does not undergo the transformation of basalt to denser eclogite. Accounting for neutrally buoyant flat segments along with large variations in slab morphology in the South American subduction zone explains alongstrike and temporal changes in dynamic topography observed in the geologic record since the beginning of the Cenozoic. Our results show that the transition from normal subduction to slab flattening generates dynamic uplift, preventing back-arc marine flooding.

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Tectonic and dynamic controls on the topography and subsidence of the Argentine Pampas: The role of the flat slab

Cited by 70 publications

References 43 publications

Cenozoic uplift of the Central Andes in northern Chile and Bolivia—reconciling paleoaltimetry with the geological evolution

Cenozoic uplift of the Central Andes in northern Chile and Bolivia—reconciling paleoaltimetry with the geological evolution

Biogeography in deep time – What do phylogenetics, geology, and paleoclimate tell us about early platyrrhine evolution?

Dynamic uplift during slab flattening

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