El Niño forcing on 10Be-based surface denudation rates in the northwestern Peruvian Andes?

Abbühl, Luca M.; Norton, Kevin; Schlunegger, Fritz; Kracht, Oliver; Aldahan, Ala; Possnert, Göran

doi:10.1016/j.geomorph.2010.07.017

Cited by 39 publications

(31 citation statements)

References 66 publications

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“…While these rates may appear fast compared to other rates from cosmogenic isotopes reported in the west central Andes (e.g., Abbühl et al, 2010, 2011; Carretier et al, 2015; Kober et al, 2007, 2009; Placzek et al, 2010; Starke et al, 2017), we note that the rates reported here are averages over long timescales of 10 7 years and could contain within them punctuated periods of activity with long periods of little exhumation. Also, though 3 χ 2 acceptable maximum values rise to ~0.8 km/Myr in the PC (Figure 10), these changes occur on shorter timescales and earlier in the mineral cooling histories where apparent exhumation is a less trustworthy indicator for mean regional exhumation or erosion.…”

Section: Discussionmentioning

confidence: 61%

“…More recent, shorter timescale denudation rates (<~10 6 years) based on catchment‐averaged 10 Be, 26 Al, and 21 Ne cosmogenic nuclide concentrations and exposure ages have been reported, as low as <1 m/Myr, up to several orders of magnitude lower than bedrock thermochronometric exhumation rates in the southern Peruvian and northern Chilean fore arc but range up to 300 m/Myr (~0.3 km/Myr) at higher elevations and slopes, particularly in the modern‐day Precordillera (Abbühl et al, 2010, 2011; Carretier, Regard, Vassallo, Aguilar, et al, 2015; Carretier, Regard, Vassallo, Martinod, et al, 2015; Kober et al, 2007, 2009; McPhillips et al, 2013; Placzek et al, 2010; Starke et al, 2017). Generally, higher rates are reported in southern Peru than in northern Chile but correlations with precipitation or hillslope angles are inconsistent (Abbühl et al, 2011; Kober et al, 2009; Reber et al, 2017; Starke et al, 2017) and extreme climatic events (e.g., El Niño) may be important (Abbühl et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Generally, higher rates are reported in southern Peru than in northern Chile but correlations with precipitation or hillslope angles are inconsistent (Abbühl et al, 2011; Kober et al, 2009; Reber et al, 2017; Starke et al, 2017) and extreme climatic events (e.g., El Niño) may be important (Abbühl et al, 2010). While local erosion rates on hyperarid surfaces in the Central Depression of northern Chile may be negligible on millennial and even million‐year timescales (Dunai et al, 2005; Kober et al, 2007), intermittent hyperaridity (e.g., Jordan et al, 2014) and the wide range of local and catchment‐averaged erosion rates in the fore arc indicated by these methods is consistent with long‐term semiaridity to aridity suggested by mean exhumation rates on low‐temperature thermochronometry timescales.…”

Section: Discussionmentioning

confidence: 99%

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Slow Long‐Term Exhumation of the West Central Andean Plate Boundary, Chile

2018

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We present a regional analysis of new low‐temperature thermochronometer ages from the Central Andean fore arc to provide insights into the exhumation history of the western Andean margin. To derive exhumation rates over 10 million‐year timescales, 38 new apatite and zircon (U‐Th)/He ages were analyzed along six ~500‐km long near‐equal‐elevation, coast parallel, transects in the Coastal Cordillera (CC) and higher‐elevation Precordillera (PC) of the northern Chilean Andes between latitudes 18.5°S and 22.5°S. These transects were augmented with age‐elevation profiles where possible. Results are synthesized with previously published thermochronometric data, corroborating a previously observed trenchward increase in cooling ages in Peru and northern Chile. One‐dimensional thermal‐kinematic modeling of all available multichronometer equal‐elevation samples reveals mean exhumation rates of <0.2 km/Myr since ~50 Ma in the PC and ~100 Ma in the CC. Regression of pseudovertical age‐elevation transects in the CC yields comparable rates of ~0.05 to ~0.12 km/Myr between ~40 and 80 Ma. Differences between the long‐term mean 1‐D rates and shorter‐term age‐elevation‐derived rates indicate low variability in the exhumation history. Modeling results suggest similar background exhumation rates in the CC and PC; younger ages in the PC are largely a function of increased heat flow and consequently an elevated geothermal gradient near the arc. Slow exhumation rates are suggestive of semiarid conditions across the region since at least the Eocene and deformation and development of the Andean fore arc around this time.

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Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Slow Long‐Term Exhumation of the West Central Andean Plate Boundary, Chile

2018

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“…Others have calculated an average scaling by integrating the product of topographic shielding and production on a pixel-by-pixel basis (e.g., Ouimet et al, 2009;Hurst et al, 2012;Scherler et al, 2014). Another strategy is to calculate both averaged topographic shielding and production scaling values for a basin (e.g., Abbühl et al, 2010). All of these approaches involve some degree of spatial averaging of production, shielding, or a combination of the two before catchment-averaged denudation rates can be estimated.…”

Section: Denudation Rates Across a Catchmentmentioning

confidence: 99%

The CAIRN method: automated, reproducible calculation of catchment-averaged denudation rates from cosmogenic nuclide concentrations

et al. 2016

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Abstract. We report a new program for calculating catchment-averaged denudation rates from cosmogenic nuclide concentrations. The method (Catchment-Averaged denudatIon Rates from cosmogenic Nuclides: CAIRN) bundles previously reported production scaling and topographic shielding algorithms. In addition, it calculates production and shielding on a pixel-by-pixel basis. We explore the effect of sampling frequency across both azimuth ( θ) and altitude ( φ) angles for topographic shielding and show that in high relief terrain a relatively high sampling frequency is required, with a good balance achieved between accuracy and computational expense at θ = 8 • and φ = 5 • . CAIRN includes both internal and external uncertainty analysis, and is packaged in freely available software in order to facilitate easily reproducible denudation rate estimates. CAIRN calculates denudation rates but also automates catchment averaging of shielding and production, and thus can be used to provide reproducible input parameters for the CRONUS family of online calculators.

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“…9). With the exception of a small dataset of erosion rates from the Washington Cascades (Moon et al, 2011), all oceanic-continent convergent zones erode more slowly than western Bhutan -for example, the Andes Mountains (Safran et al, 2005;Kober et al, 2007Kober et al, , 2009Vanacker et al, 2007;Abbühl et al, 2010;Insel et al, 2010;Placzek et al, 2010;Bookhagen and Strecker, 2012;Walcek and Hoke, 2012) and Panama (Nichols et al, 2005b;Sosa-Gonzalez, 2012) -though this comparison suffers from a lack of studies along oceanic plate subduction zones outside of South America. Compared to other continent-continent collisional zones, an ANOVA shows that erosion along the Himalayan Range (from all studies, Fig.…”

Section: Erosion In Active Orogensmentioning

confidence: 99%