The Influence of Climate on the Dynamics of Mountain Building Within the Northern Patagonian Andes

Morabito, Ezequiel García; Beltrán‐Triviño, Alejandro; Terrizzano, Carla; Bechis, Florencia; Likerman, Jeremías; Quadt, Albrecht von; Ramos, Víctor A.

doi:10.1029/2020tc006374

Cited by 14 publications

(1 citation statement)

References 98 publications

(212 reference statements)

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“…These structures are related to a regional contractional deformation phase that occurred between 19 and 10 Ma in association with flat‐slab subduction and dynamic processes (Butler et al, 2020; Folguera et al, 2018; Ramos et al, 2014). The regional contractional phase agrees with a tectonically induced uplift evidenced by apatite fission‐tracks and apatite (U‐Th)/He (AHe) dating along the axial part of the Patagonian Andean orogen (Folguera et al, 2015; Guillaume et al, 2013; Thomson et al, 2010), as well as AHe and 10Be surface exposure dating from the Patagonian foreland region (García Morabito et al, 2021; Genge et al, 2021; Savignano et al, 2016). At the same time, the Andean uplift triggered a rain shadow effect that produced a gradual aridification process between 14.6 and 10 Ma (Bucher et al, 2020).…”

Section: Discussionsupporting

confidence: 74%

Decoupling external forcings during the development of Miocene fluvial stratigraphy of the North Patagonian Foreland

López,

Milanese,

D'Elia

et al. 2023

Basin Research

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The Patagonian Andean foreland system includes several intermountain basins filled with a Miocene non‐marine record deposited under syn‐tectonic conditions related to the Andean uplift and a regional climate change triggered by a rain shadow effect. Many of those basins, such as the Collón Cura basin in Neuquén Province, Argentina, present a well‐preserved fluvial record (i.e. the Limay Chico Member of the Caleufú Formation). Sedimentological and palaeomagnetic studies have allowed the interpretation of coeval transverse distributary fan and axial mixed‐load fluvial systems deposited between 10.6 ± 0.2 and 12.8 Ma. The basin infill arrangement shows that, while the axial mixed‐load fluvial system exhibits an aggradational stacking pattern, the transverse distributary fluvial fan system denotes three different orders of stratigraphic patterns: (i) large‐scale progradation of the transverse fluvial fan system over a time scale of 106 year; (ii) intermediate‐scale progradational–retrogradational transverse intra‐basinal fluvial fan episodes over a time scale of 105 year; and (iii) small‐scale transverse lobe progradation over a time scale of 105–104 year. These patterns were interpreted as transverse sediment flux variations triggered by variable external forcings. To decouple those forcings, we estimated the Collón Cura basin equilibrium time at 3–5 × 105 year and compared it with the time scale over which different external forcings varied in the Patagonian Andean and foreland regions during Miocene times. Large‐scale progradation is linked to an increase in sediment flux triggered by a long‐term tectonically driven exhumation forcing associated with the Miocene Patagonian Andean contractional phase. Intermediate‐scale progradational–retrogradational episodes are linked to variations in sediment flux due to a mid‐term tectonic forcing associated with the western fault system activity. The small‐scale fan lobe progradation is related to increases in sediment flux triggered by indistinguishable short‐term autogenic processes and/or high‐frequency tectonic and climatic forcings. This contribution shows the applicability and limitations of the basin equilibrium time concept to decouple external forcings from the geological record, considering their magnitude, nature and time scale, as well as the basin characteristics.

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Section: Discussionsupporting

confidence: 74%

Decoupling external forcings during the development of Miocene fluvial stratigraphy of the North Patagonian Foreland

López,

Milanese,

D'Elia

et al. 2023

Basin Research

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The Miocene lacustrine carbonate factory of the Ñirihuau Formation, Ñirihuau Basin, North Patagonian Andes, Argentina

Santonja,

Benavente,

Suriano

et al. 2024

The Depositional Record

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Facies, microfacies and stable isotope analyses of limestone beds in the northernmost Ñirihuau Basin, North Patagonian Andes, Argentina, document and constrain the past hydrological, sedimentological and climate conditions that prevailed during the deposition of a lacustrine system between ca 15 and 13 Ma. This palaeoenvironment is recorded in the middle section of the Ñirihuau Formation, which holds significance because: (1) It was deposited during a transition from an extensional to a compressional tectonic regime; (2) it spans the Middle Miocene Climatic Optimum and the beginning of the Middle Miocene Climatic Transition; and (3) it contains limestone beds interbedded within a 600 m thick interval of mudstones and siltstones, along with intercalated sandstone and volcaniclastic bodies. Two detailed sedimentary logs were surveyed along the Arroyo Las Bayas, at the western and eastern flank of the David Syncline. Limestones from both stratigraphic sections were sampled as well as isolated limestone beds from two other sites. One facies association was defined and interpreted as a perennial lake associated with a deltaic system and dominated by detrital clastic material. It comprises Facies 1 (Marginal lacustrine) and Facies 2 (Lower delta plain); in both, the presence of grainstones and calcimudstones stands out. Through petrography and cathodoluminescence studies of these continental carbonates, nine microfacies were identified: (a) Intraclastic grainstone, (b) Homogeneous calcimudstone, (c) Silty grainstone, (d) Disrupted micrite, (e) Birds eye micrite, (f) Bioclastic mudstone, (g) Calcimudstone with sparse detrital grains, (h) Fenestral micrite, (i) Stromatolitic boundstone. These indicate mainly bio‐induced subaqueous carbonate precipitation and subordinate deposition by tractive flows with short‐distance transport on a littoral lacustrine environment. Most of these microfacies exhibit very early diagenesis (eogenesis) effects. These features, and the geochemistry results, indicate that they were deposited in a palaeolake system under temperate to warm and humid conditions.

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The European glacial landscapes prior to the Last Glacial Maximum - synthesis

Hughes¹,

Palacios²,

García‐Ruiz³

et al. 2022

European Glacial Landscapes

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The Influence of Climate on the Dynamics of Mountain Building Within the Northern Patagonian Andes

Cited by 14 publications

References 98 publications

Decoupling external forcings during the development of Miocene fluvial stratigraphy of the North Patagonian Foreland

Decoupling external forcings during the development of Miocene fluvial stratigraphy of the North Patagonian Foreland

The Miocene lacustrine carbonate factory of the Ñirihuau Formation, Ñirihuau Basin, North Patagonian Andes, Argentina

The European glacial landscapes prior to the Last Glacial Maximum - synthesis

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