Quaternary landscape evolution in the Western Argentine Precordillera constrained by 10Be cosmogenic dating

Peri, Verónica Gisel; Haghipour, Negar; Christl, Marcus; Terrizzano, Carla; Kaveh‐Firouz, Amaneh; Leiva, Maria Flavia; Pérez, Pablo; Yamin, Marcela Gladys; Barcelona, Hernán; Burg, Jean‐Pierre

doi:10.1016/j.geomorph.2021.107984

Cited by 7 publications

(8 citation statements)

References 112 publications

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“…Cosmogenic nuclides as a "gold standard" enable us to acquire the most recent erosion rates and related tectonic-climate coupling or uncoupling (Granger & Schaller, 2014). Catchment-wide erosion rate from 10 Be is one of the best approaches to quantify landscape short-term erosion rates (10 3 -10 6 yr; Dunai, 2010;Gosse & Phillips, 2001) along with detailed climatic-topographic analyses (e.g., Collignon et al, 2019;Forte, Leonard, et al, 2022;Li et al, 2014;Peri et al, 2022).…”

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confidence: 99%

Tectonics, Base‐Level Fluctuations, and Climate Impact on the Eocene to Present‐Day Erosional Pattern of the Arabia‐Eurasia Collision Zone (NNW Iranian Plateau and West Alborz Mountains)

et al. 2023

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The NNW Iranian Plateau and west Alborz within the Arabia‐Eurasia collision zone are characterized by three main tectono‐stratigraphic zones, crosscut by the Qezel‐Owzan River (QOR) Basin. The interplay between present‐day deformation and climate, which control the landscape evolution of the region, is still poorly constrained. We addressed this gap by measuring millennial‐scale erosion rates from 10Be‐concentration in the QOR sands along with topographic/climatic metrics analyses. Results reveal low erosion rates in the Plateau and relatively high in the west Alborz. The regional consistency of topographic parameters with geomorphology suggests that they control sediment fluxes in the Plateau, while the surface uplift, active thrust‐faulting, and shallow crustal seismicity in the west Alborz are the main controlling factors. Climate has a secondary role on erosion rates. Furthermore, we calculated exhumation rates from published thermochronometric AFT/AHe ages to determine their relationship with 10Be short‐term data. Results imply that the exhumation rates increased slightly in the Plateau and west Alborz from ∼26 to ∼10 Ma, simultaneous with hard collision processes between the Arabia‐Eurasia. This trend accelerated from ∼10 to ∼2.8 Ma due to the isolation of the Caspian Sea and extreme base‐level fall. From ∼2.8 to ∼2 Ma, base‐level rise occurred under climate influence, and erosion rates decreased. Millennial‐scale data show the erosion rate decreased from ∼2 Ma to the Present‐day, which is attributed to the change in deformation style and fault kinematics from fold/thrusting to mainly strike‐slip faulting. The significantly lower erosion rates in the Plateau compared to west Alborz suggest a relatively stable plateau surface.

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Tectonics, Base‐Level Fluctuations, and Climate Impact on the Eocene to Present‐Day Erosional Pattern of the Arabia‐Eurasia Collision Zone (NNW Iranian Plateau and West Alborz Mountains)

et al. 2023

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“…This abandonment can occur due to changes in sediment supply (Brooke et al, 2018;Tofelde et al, 2019), tectonic deformation and base level change (Ganev et al, 2010;Mouslopoulou et al, 2017), climate-induced changes in water discharge (Steffen et al, 2010;Savi et al, 2016) or drainage reorganization (Bufe et al, 2017). Because fan surfaces can remain active for 10 2-5 years before being incised (Cesta and Ward, 2016;Dühnforth et al, 2017;Ratnayaka et al, 2019;Peri et al, 2022), the age distribution or minimum exposure age of boulders on an alluvial fan surface will not necessarily tightly constrain the timing of abandonment. Instead, the distribution of CRN ages, after excluding clear outliers, more likely reflects phases of fan activity, and at best, provide a minimum age limit for the onset of incision leading to eventual surface abandonment (D'Arcy et al, 2019b).…”

Section: Methodsmentioning

confidence: 99%

“…Circle symbols denote regional glacial record locations: (1) Nevado de Chañi (24.0°S, 65.7°W; Martini et al, 2017), (2) Quevar Volcano (24.4°S, 66.8°W; Luna et al, 2018), (3) Sierra de Quilmes (26.2°S, 66.2°W; Zech et al, 2017) and the (4) Sierra de Aconquija (27.2°S, 66.1°W;D'Arcy et al, 2019a). Pentagon symbols denote MPT geomorphic record locations: (1) Casa Grande Basin (23°S, 66.5°W; Pingel et al, 2019b), (2) Salinas Grandes Basin (23.5°S, 66°W; Pingel et al, 2019b), (3) Iglesia Basin (30.5°S, 69°W; Terrizzano et al, 2017), (4) Calingasta Basin (32°S, 69.5°W; Peri et al, 2022), (5) Río Deseado (47°S, 72°W; Tobal et al, 2021), (6) Río Santa Cruz (50°S, 73°W; Milanez Fernandes, 2023). Inset map of South America indicates Fig.…”

Section: Introductionmentioning

confidence: 99%

Landscape response to tectonic deformation and cyclic climate change since ca. 800 ka in the southern Central Andes

Orr,

Schildgen,

Tofelde

et al. 2024

Preprint

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Abstract. Theory suggests that the response time of alluvial channel long-profiles to perturbations in climate is related to the magnitude of the forcing and the length of the system. Shorter systems may record a higher frequency of forcing compared to longer systems. Empirical field evidence that system length plays a role in the climate periodicity preserved within the sedimentary record is, however, sparse. The Toro Basin in the Eastern Cordillera of NW Argentina provides an opportunity to test these theoretical relationships as this single source-to-sink system contains a range of sediment deposits, located at varying distances from the source. A suite of eight alluvial fan deposits is preserved along the western flanks of the Sierra de Pascha. Farther downstream, a flight of cut-and-fill terraces have been linked to eccentricity-driven (100-kyr) climate cycles since ca. 500 ka. We applied cosmogenic radionuclide (10Be) exposure dating to the fan surfaces to explore (1) how channel responses to external perturbations may or may not propagate downstream, and (2) the differences in landscape response to forcing frequency as a function of channel length. We identified two generations of fan surfaces: the first (G1) records surface activity and abandonment between ca. 800 and 500 ka and the second (G2) within the last 100 kyr. G1 fans record a prolonged phase of net incision, which has been recognised throughout the Central Andes, and was likely triggered by enhanced 100-kyr global glacial cycles following the Mid-Pleistocene Transition. Relative fan surface stability followed, while 100-kyr cut-and-fill cycles occurred downstream, suggesting a disconnect in behaviour between the two channel reaches. G2 fans record higher frequency climate forcing, possibly the result of precessional forcing of climate (ca. 21/40-kyr timescales). The lack of a high-frequency signal farther downstream provides field support for theoretical predictions of a filtering of high-frequency climate forcing with increasing channel length. We show that multiple climate periodicities can be preserved within the sedimentary record of a single basin. Differences in the timing of alluvial fan and fluvial terrace development in the Toro Basin appears to be associated with how channel length affects fluvial response times to climate forcing as well as local controls on net incision, such as tectonic deformation.

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“…The normalized channel steepness index ( k sn , m 0.9 ) is a metric that quantifies the local steepness of a river channel relative to its drainage area for the nonlinear, using a reference concavity θ ref = 0.45 (Adams et al, 2020; Whipple, 2004). The positive empirical correlation between k sn and erosion rates makes it a preferred tool for tectonic geomorphology, as well as demonstrating either temporal or progressive changes in rock uplift or climate (e.g., DiBiase et al, 2010; Haghipour & Burg, 2014; Kirby & Whipple, 2012; Mandal et al, 2017; Obaid & Allen, 2019; Peri et al, 2022; Whittaker et al, 2007). However, k sn cannot be used as a proxy for uplift in river channels either shaped by or transitioning from glacial erosion.…”

Section: Methodsmentioning

confidence: 99%

Landscape evolution in orogenic plateaus: Insights from quantitative morphotectonic analysis of the Turkish–Iranian Plateau and Caucasus regions

Kaveh‐Firouz,

Burg,

Giachetta

2023

Earth Surf Processes Landf

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To investigate the recent landscape evolution of the orogenic Turkish–Iranian Plateau (TIP) and the Lesser/Greater Caucasus ranges, we perform a quantitative analysis of topography and drainage networks at a regional scale. This analysis focuses on climatic–topographic swath profiles, local relief distribution, longitudinal river profiles, normalized channel steepness index (ksn), paleo‐river profile, and chi analysis (χ). In general, we find that the evolution of topographic relief and river networks are locally controlled by Late Cenozoic volcanism, contrasts in rock strength, and neotectonic activity along regional tectonic structures. However, our results show that the influence of these factors on the landscape evolution of the Greater Caucasus is significantly different from the Lesser Caucasus and TIP. This study shows that a combination of enhanced aridity, rapid uplift of orographic barriers along the TIP margins, and exposure of resistant rock types associated with the regional volcanic activity resulted in low‐relief plateau and the Lesser Caucasus surfaces that are preserved in the upper/middle Kura–Arax and Qezel‐Owzan river catchments. High local relief in the flanks of the Greater Caucasus and west Alborz, downstream increase in channel steepness, and perturbations in the χ plots of the three main rivers indicate that the topography is in a transient state.We reconstruct the paleo‐river profiles from the relict section of the upper Kura–Arax and Qezel‐Owzan rivers and show that the last drastic fall of the Caspian base‐level, which occurred during the Late Miocene–Early Pliocene, can explain the incision of ~500–1000 m gorges (i.e., Amardos) below major knickpoints. Furthermore, local cross‐divide differences of the χ parameter reveal that disequilibrium in the plan‐form geometry of the drainage networks, attributed to the upstream migration of the regional knickpoints towards the plateau interior and integration of plateau areas into the external fluvial system.

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Quaternary landscape evolution in the Western Argentine Precordillera constrained by 10Be cosmogenic dating

Cited by 7 publications

References 112 publications

Tectonics, Base‐Level Fluctuations, and Climate Impact on the Eocene to Present‐Day Erosional Pattern of the Arabia‐Eurasia Collision Zone (NNW Iranian Plateau and West Alborz Mountains)

Tectonics, Base‐Level Fluctuations, and Climate Impact on the Eocene to Present‐Day Erosional Pattern of the Arabia‐Eurasia Collision Zone (NNW Iranian Plateau and West Alborz Mountains)

Landscape response to tectonic deformation and cyclic climate change since ca. 800 ka in the southern Central Andes

Landscape evolution in orogenic plateaus: Insights from quantitative morphotectonic analysis of the Turkish–Iranian Plateau and Caucasus regions

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