Thermal and geodynamic contributions to the elevation of the Altiplano–Puna plateau

Prezzi, Claudia Beatriz; Llanos, María Paula Iglesia; Götze, Hans‐Jürgen; Schmidt, Sabine

doi:10.1016/j.pepi.2014.10.002

Cited by 5 publications

(2 citation statements)

References 59 publications

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“…According to the latter studies, low v p /v s ratios (P wave/S wave velocity <1.75) characterize the flat-slab segment in the northern part of the SCA, in contrast to the higher v p /v s ratios encountered to the south, which are within the range typically found for most subduction zones [73]. The thermal contrast between the two differently dipping segments in the SCA is commonly linked to variations in the extent of the mantle wedge and arc magmatism, both 2 Lithosphere of which are drastically reduced in the flat-slab segment [31,[73][74][75][76][77]. All previous studies therefore seem to suggest that the forearc is an area with low surface heat flow in response to the subduction of cold oceanic crust at shallow depths.…”

Section: Introductionmentioning

confidence: 71%

Controls of the Lithospheric Thermal Field of an Ocean-Continent Subduction Zone: The Southern Central Andes

et al. 2022

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In an ocean-continent subduction zone, the assessment of the lithospheric thermal state is essential to determine the controls of the deformation within the upper plate and the dip angle of the subducting lithosphere. In this study, we evaluate the degree of influence of both the configuration of the upper plate (i.e., thickness and composition of the rock units) and variations of the subduction angle on the lithospheric thermal field of the southern Central Andes (29°–39°S). Here, the subduction angle increases from subhorizontal (5°) north of 33°S to steep (~30°) in the south. We derived the 3D temperature and heat flow distribution of the lithosphere in the southern Central Andes considering conversion of S wave tomography to temperatures together with steady-state conductive thermal modeling. We found that the orogen is overall warmer than the forearc and the foreland and that the lithosphere of the northern part of the foreland appears colder than its southern counterpart. Sedimentary blanketing and the thickness of the radiogenic crust exert the main control on the shallow thermal field (<50 km depth). Specific conditions are present where the oceanic slab is relatively shallow (<85 km depth) and the radiogenic crust is thin. This configuration results in relatively colder temperatures compared to regions where the radiogenic crust is thick and the slab is steep. At depths >50 km, the temperatures of the overriding plate are mainly controlled by the mantle heat input and the subduction angle. The thermal field of the upper plate likely preserves the flat subduction angle and influences the spatial distribution of shortening.

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Section: Introductionmentioning

confidence: 71%

Controls of the Lithospheric Thermal Field of an Ocean-Continent Subduction Zone: The Southern Central Andes

et al. 2022

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“…Hasterok and Chapman proposed a correction to normalize the crust that consists of a simple isostatic calculation. Prezzi et al (2014) applied it successfully to the Altiplano-Puna plateau to isolate the thermal contribution to the computed elevation. If we apply a similar correction for our model by taking a reference model of 39 km of crustal thickness and 2.75 g/cm3 of density-information that coincides with a point with seismic data within Chilenia (Gomez Dacal et al 2017)-we obtain a correction to the elevation of 900 m. Therefore, we arrive at a maximum of 100 m (closely to 10%) of the elevation (~ 1000 m), which is accounted for thermal effects only, that is in the order of the result obtained by thermal isostasy for the present day (Fig.…”

Section: Transient Thermal Fieldmentioning

confidence: 99%

Unravelling the lithospheric-scale thermal field of the North Patagonian Massif plateau (Argentina) and its relations to the topographic evolution of the area

Dacal

Scheck‐Wenderoth

Aragón

et al. 2020

Int J Earth Sci (Geol Rundsch)

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The North Patagonian Massif (NPM) area in Argentina includes a plateau of 1200 m a.s.l. (meters above sea level) average height, which is 500–700 m higher than its surrounding areas. The plateau shows no evidence of internal deformation, while the surrounding basins have been deformed during Cenozoic orogenic events. Previous works suggested that the plateau formation was caused by a lithospheric uplift event during the Paleogene. However, the causative processes responsible for the plateau origin and its current state remain speculative. To address some of these questions, we carried out 3D lithospheric-scale steady-state and transient thermal simulations of the NPM and its surroundings, as based on an existing 3D geological model of the area. Our results are indicative of a thicker and warmer lithosphere below the NPM plateau compared with its surroundings, suggesting that the plateau is still isostatically buoyant and thus explaining its present-day elevation. The transient thermal simulations agree with a heating event in the mantle during the Paleogene as the causative process leading to lithospheric uplift in the region and indicate that the thermo-mechanical effects of such an event would still be influencing the plateau evolution today. Although the elevation related to the heating would not be enough to reach the present plateau topography, we discuss other mechanisms, also connected with the mantle heating, that may have caused the observed relief. Lithosphere cooling in the plateau is ongoing, being delayed by the presence of a thick crust enriched in radiogenic minerals as compared to its sides, resulting in a thermal configuration that has yet to reach thermodynamic equilibrium.

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Crustal anatomy and evolution of a subduction-related orogenic system: Insights from the Southern Central Andes (22-35°S)

Giambiagi

Tassara²,

Echaurren³

et al. 2022

Earth-Science Reviews

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Thermal and geodynamic contributions to the elevation of the Altiplano–Puna plateau

Cited by 5 publications

References 59 publications

Controls of the Lithospheric Thermal Field of an Ocean-Continent Subduction Zone: The Southern Central Andes

Controls of the Lithospheric Thermal Field of an Ocean-Continent Subduction Zone: The Southern Central Andes

Unravelling the lithospheric-scale thermal field of the North Patagonian Massif plateau (Argentina) and its relations to the topographic evolution of the area

Crustal anatomy and evolution of a subduction-related orogenic system: Insights from the Southern Central Andes (22-35°S)

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