Measuring dynamic topography in South America

Dávila, Federico M.; Ávila, Pilar; Martina, Federico; Canelo, Horacio N.; Nóbile, Julieta C.; Collo, Gilda; Nassif, Francisco Sánchez; Ezpeleta, Miguel

doi:10.1016/b978-0-12-816009-1.00003-4

Cited by 6 publications

(5 citation statements)

References 101 publications

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“…Past studies have suggested that the Patagonian slab window is a likely setting for ongoing dynamic uplift, which we confirm here (Dávila & Lithgow‐Bertelloni, 2013; Dávila et al., 2019; Flament et al., 2015; Guillaume et al., 2009, 2010, 2013). Flament et al.…”

Section: Resultssupporting

confidence: 88%

“…Past studies have suggested that the Patagonian slab window is a likely setting for ongoing dynamic uplift, which we confirm here (Dávila & Lithgow-Bertelloni, 2013;Dávila et al, 2019;Flament et al, 2015;Guillaume et al, 2009Guillaume et al, , 2010Guillaume et al, , 2013. Flament et al (2015) modeled time-dependent flow, and their most recent DT change predictions (∼10 Ma to present) generally agree with our suite of DT change scenarios, indicating broad regional 2015) used these features to validate geodynamic models of northward migration of the CTJ during the Miocene.…”

Section: Dynamic Topography Changesupporting

confidence: 86%

“…This structure, which consists of hot upwelling asthenosphere through the Patagonian slab window and coincident downwelling of the underlying remnant Nazca slab, is a probable setting for changes in DT through time that may be responsible for differential upwarping of the three observed early Pliocene paleoshorelines. While previous work (Ávila & Dávila, 2018(Ávila & Dávila, , 2020Dávila & Lithgow-Bertelloni, 2013;Dávila et al, 2019;Flament et al, 2015;Guillaume et al, 2009) has shed light on possible convection dynamics and deformation histories of the Patagonian foreland, we present a new generation of models that is directly constrained by seismically imaged present-day mantle structure.…”

Section: Tectonic Settingmentioning

confidence: 99%

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A Revised Estimate of Early Pliocene Global Mean Sea Level Using Geodynamic Models of the Patagonian Slab Window

Hollyday

Austermann

Lloyd

et al. 2023

Geochem Geophys Geosyst

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As anthropogenic warming continues to melt continental ice and deliver it to the global oceans, mitigation plans will require more confident projections of sea-level rise. The capability of coupled ice-Earth-sea-level models to predict the amplitude and timing of sea-level rise during this century relies on uncertain calibrations of ice sheet sensitivity to variable amounts of warming in Earth's past DeConto et al., 2021;Fischer et al., 2018). While the mid-Pliocene Epoch has already been used as a calibration target that significantly affects projections of future sea-level change DeConto et al., 2021), the early Pliocene Epoch (5.3-3.6 Ma) has so far received less attention. This time consisted of interglacial global mean temperatures around 4°C higher than today and CO 2 concentrations above 400 ppm (

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Section: Resultssupporting

confidence: 88%

Section: Dynamic Topography Changesupporting

confidence: 86%

Section: Tectonic Settingmentioning

confidence: 99%

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A Revised Estimate of Early Pliocene Global Mean Sea Level Using Geodynamic Models of the Patagonian Slab Window

Hollyday

Austermann

Lloyd

et al. 2023

Geochem Geophys Geosyst

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“…A recent study from Aramendía et al. (2022) reinforced the idea that the major controls on mid‐Miocene foreland sedimentation were Andean uplift, eastward migration of the FTB, and tectonic loading (Dávila et al., 2019). In contrast, Valenzuela et al., 2021 suggested a possible flat‐slab subduction event at ∼18–16 Ma, prior to the subduction of the Chile Rise, based on the migration of the magmatic arc.…”

Section: Geological and Geodynamical Settingsmentioning

confidence: 90%

“…This unit was interpreted as synorogenic terrestrial strata (Flint et al, 1994;Lagabrielle et al, 2004;Suarez & De La Cruz, 2000), which implies that tectonic compression lasted at least until mid-Miocene (Aramendía et al, 2022;Folguera et al, 2018). A recent study from Aramendía et al (2022) reinforced the idea that the major controls on mid-Miocene foreland sedimentation were Andean uplift, eastward migration of the FTB, and tectonic loading (Dávila et al, 2019). In contrast, Valenzuela et al, 2021 suggested a possible flat-slab subduction event at ∼18-16 Ma, prior to the subduction of the Chile Rise, based on the migration of the magmatic arc.…”

Section: Geological and Geodynamical Settingsmentioning

confidence: 98%

Mechanisms of Subsidence and Uplift of Southern Patagonia and Offshore Basins During Slab Window Formation

Ding

Dávila

Lithgow‐Bertelloni

2023

Geochem Geophys Geosyst

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Subduction of bathymetric anomalies (e.g., an active ridge) can alter the morphology of subducted slabs and their coupling to surface processes. A natural laboratory to study these effects is the subduction of the Oceanic Chilean Ridge beneath the South American plate, which led to the formation of the Patagonian slab window. Its formation and subsequent northward migration contributed to the regression of Patagoniense sea and exhumation of marine strata to their present elevation. To date, there is no quantitative analysis of the effects on the sediment routing system of the slab window. We modeled the Neogene topographic change and foreland sedimentary evolution from the Andean Cordillera to Atlantic margin. Our results show that subcrustal‐driven subsidence correlated with accelerated subduction of the Nazca plate is required to explain the timing of the Patagonian transgression and thickness and spatial extent of marine beds during the incursion. In other words, traditional mechanisms, such as foreland flexure and global sea‐level rise, are insufficient. The subsequent regression and accumulation of mid‐Miocene alluvial‐fluvial deposits were associated with the growth of the Cordillera and a possible flattening of Nazca subduction in the middle Miocene. Isostatic uplift of ∼1 km due to lithospheric thinning during slab window formation can explain the foreland exhumation, sediment bypass, and increases in the offshore sedimentation rate. However, spatial‐temporal varying dynamic uplift is required to explain the along‐strike variations in foreland sedimentation. Our study provides new insights into the interplay between slab window formation, crustal deformation, and landscape evolution.

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Biotectonics: Making and Breaking Barriers

Ebach

Michaux²

2020

SpringerBriefs in Evolutionary Biology

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Measuring dynamic topography in South America

Cited by 6 publications

References 101 publications

A Revised Estimate of Early Pliocene Global Mean Sea Level Using Geodynamic Models of the Patagonian Slab Window

A Revised Estimate of Early Pliocene Global Mean Sea Level Using Geodynamic Models of the Patagonian Slab Window

Mechanisms of Subsidence and Uplift of Southern Patagonia and Offshore Basins During Slab Window Formation

Biotectonics: Making and Breaking Barriers

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