Basinga: A cell‐by‐cell GIS toolbox for computing basin average scaling factors, cosmogenic production rates and denudation rates

Charreau, Julien; Blard, Pierre‐Henri; Zumaque, Jéna; Martin, Léo; Delobel, Tony; Szafran, Lucas

doi:10.1002/esp.4649

Cited by 32 publications

(46 citation statements)

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“…The sediment of the Lower Meghna River and of the Bengal Fan is presumed to follow a mixing trend between two poles, the Ganga and the Brahmaputra Rivers. As shown by results from the late Cenozoic foreland sediment in Central Himalaya [61][62][63] , the Himalayan tributaries and therefore the Ganga River are assumed to have had a past signature roughly close to the modern one since ca. 10 Ma.…”

Section: Competing Interestsmentioning

confidence: 99%

“…We assume that the 10 Production and erosion rates. We used Basinga 61 to compute the modern 10 Be production rates, considering the neutron, slow muon, and fast muon pathways with constant attenuation lengths. We set the sea level high latitude production rate at the global mean of 4.18 atom/g 62 , with factors of 0.9886, 0.0027 and 0.0087 for the neutron, slow and fast muonic contributions 63 .…”

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confidence: 99%

“…The drainage basins entered into Basinga 61 Ma. The variations of the average cosmogenic nuclide production rate have remained within our 10 Be uncertainties (Extended Data Fig.…”

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Steady erosion rates in the Himalayas through late Cenozoic climatic changes

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Steady erosion rates in the Himalayas through late Cenozoic climatic changes

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“…Therefore, we reconstructed in detail the sediment sources and their evolution through time using geochemical records, including new major and trace element and Sr-Nd isotopic analyses (Section 3.5). The cosmogenic production rates were estimated using the Basinga GIS Tool (Charreau et al, 2019;Supporting information) and the topography of modern drainage basins expected to be like the past drainage basins. Indeed, H and O isotopic analyses suggest that the topography of the northern Himalayas has remained similar since the early Miocene (Gébelin et al, 2013).…”

Section: General Approachmentioning

confidence: 99%

A 6 Ma record of palaeodenudation in the central Himalayas from in situ cosmogenic ¹⁰Be in the Surai section

et al. 2020

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To better constrain late Neogene denudation of the Himalayas, we analysed in situ 10 Be concentrations in 17 Neogene sediment samples of the Surai section (central Nepal) and two modern sediment samples of the Rapti River. We first refined the depositional ages of the Surai section from 36 new paleomagnetic analyses, five 26 Al/ 10 Be burial ages, and, based on the Dynamic Time Warping algorithm, 10 4 automatically calculated likely magnetostratigraphic correlations. We also traced changing sediment sources using major element and Sr-Nd isotopic data, finding at 4-3 Ma a switch from a large, trans-Himalayan river to a river draining only the Lesser Himalaya and Siwalik piedmont, increasing the contribution of recycled sediments at that time. 10 Be concentrations in Neogene sediments range from (1.00 ± 0.36) to (5.22 ± 0.98) × 10 3 at g-1 and decrease with stratigraphic age. Based on a flood plain transport model, our refined age model, and assuming a drainage change at 4-3 Ma, we reconstructed 10 Be concentrations at the time of deposition. Assuming cosmogenic production rates similar to those of the modern basins, we calculated palaeodenudation rates of 0.9 ± 0.5 to 3.9 ± 2.7 mm a-1 from ca. 6 to 3 Ma in the palaeo-Karnali basin and 0.6 ± 0.2 to 1.6 ± 0.8 mm a-1 since ca. 3 Ma in the palaeo-Rapti basin. Given the uncertainties and similar modern values of ~2 mm a-1 , the palaeo-Karnali denudation rates may have been steady at ~1.7 ± 0.3 mm a-1 for the last ca. 6 Ma. A transient acceleration of the denudation in the palaeo-Rapti basin of ~1.5 mm a-1 since ca. 1.5 Ma was likely due to the reworking of older, 10 Be-depleted Siwalik sediments in the foreland. If true, this steadiness of the denudation rates may suggest that Quaternary glaciations did not largely affect Himalayan denudation. K E Y W O R D S cosmogenic 10 Be, Himalaya, late Neogene, palaeodenudation rates | 1219 EAGE CHARREAU Et Al.

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“…For the VAR-16-2, TIN-16-1, and VES-16-2 subbasins, we used subbasin 10 Be denudation rates (Table 2). We used the OCTOPUS database (Codilean et al, 2018) to acquire data from the Alps (Buechi et al, 2014;Chittenden et al, 2014;Delunel et al, 2010;Dixon et al, 2016;Glotzbach et al, 2013;Grischott et al, 2017a;Molliex et al, 2016;Norton et al, 2008Norton et al, , 2011Savi et al, 2014;Wittmann et al, 2007Wittmann et al, , 2016.…”

Section: Comparison With Previously Published 10 Be Studies Across Thmentioning

confidence: 99%

Denudation systematics inferred from in situ cosmogenic ¹⁰Be concentrations in fine (50–100 µm) and medium (100–250 µm) sediments of the Var River basin, southern French Alps

Mariotti¹,

Blard²,

Charreau³

et al. 2019

Earth Surf. Dynam.

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Marine sedimentary archives are well dated and often span several glacial cycles; cosmogenic 10 Be concentrations in their detrital quartz grains could thus offer the opportunity to reconstruct a wealth of past denudation rates. However, these archives often comprise sediments much finer (< 250 µm) than typically analyzed in 10 Be studies, and few studies have measured 10 Be concentrations in quartz grains smaller than 100 µm or assessed the impacts of mixing, grain size, and interannual variability on the 10 Be concentrations of such fine-grained sediments. Here, we analyzed the in situ cosmogenic 10 Be concentrations of quartz grains in the 50-100 and 100-250 µm size fractions of sediments from the Var basin (southern French Alps) to test the reliability of denudation rates derived from 10 Be analyses of fine sands. The Var basin has a short transfer zone and highly variable morphology, climate, and geology, and we test the impact of these parameters on the observed 10 Be concentrations. Both analyzed size fractions returned similar 10 Be concentrations in downstream locations, notably at the Var's outlet, where concentrations ranged from (4.02±0.78)×10 4 to (4.40±0.64)×10 4 atoms g −1 of quartz. By comparing expected and observed 10 Be concentrations at three major river junctions, we interpret that sediment mixing is efficient throughout the Var basin. We resampled four key locations 1 year later, and despite variable climatic parameters during that period, interannual 10 Be concentrations were in agreement within uncertainties, except for one upper subbasin. The 10 Be-derived denudation rates of Var subbasins range from 0.10 ± 0.01 to 0.57 ± 0.09 mm yr −1 , and spatial variations are primarily controlled by the average subbasin slope. The integrated denudation rate of the entire Var basin is 0.24 ± 0.04 mm yr −1 , in agreement with other methods. Our results demonstrate that fine-grained sediments (50-250 µm) may return accurate denudation rates and are thus potentially suitable targets for future 10 Be applications, such as studies of paleo-denudation rates using offshore sediments.Published by Copernicus Publications on behalf of the European Geosciences Union. 1060 A. Mariotti et al.: Denudation systematics inferred from in situ cosmogenic 10 Be concentrations

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Basinga: A cell‐by‐cell GIS toolbox for computing basin average scaling factors, cosmogenic production rates and denudation rates

Cited by 32 publications

References 62 publications

Steady erosion rates in the Himalayas through late Cenozoic climatic changes

Steady erosion rates in the Himalayas through late Cenozoic climatic changes

A 6 Ma record of palaeodenudation in the central Himalayas from in situ cosmogenic ¹⁰Be in the Surai section

Denudation systematics inferred from in situ cosmogenic ¹⁰Be concentrations in fine (50–100 µm) and medium (100–250 µm) sediments of the Var River basin, southern French Alps

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Basinga: A cell‐by‐cell GIS toolbox for computing basin average scaling factors, cosmogenic production rates and denudation rates

Cited by 32 publications

References 62 publications

Steady erosion rates in the Himalayas through late Cenozoic climatic changes

Steady erosion rates in the Himalayas through late Cenozoic climatic changes

A 6 Ma record of palaeodenudation in the central Himalayas from in situ cosmogenic 10Be in the Surai section

Denudation systematics inferred from in situ cosmogenic 10Be concentrations in fine (50–100 µm) and medium (100–250 µm) sediments of the Var River basin, southern French Alps

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A 6 Ma record of palaeodenudation in the central Himalayas from in situ cosmogenic ¹⁰Be in the Surai section

Denudation systematics inferred from in situ cosmogenic ¹⁰Be concentrations in fine (50–100 µm) and medium (100–250 µm) sediments of the Var River basin, southern French Alps