Differences in 10Be concentrations between river sand, gravel and pebbles along the western side of the central Andes

S. Carretier, V. Regard, R. Vassallo, G. Aguilar, J. Martinod, R. Riquelme, F. Christophoul, R. Charrier, E. Gayer, M. Farías, L. Audin, C. Lagane

Resultado de la investigación: Article

25 Citas (Scopus)

Resumen

Cosmogenic nuclides in river sediment have been used to quantify catchment-mean erosion rates. Nevertheless, variable differences in 10Be concentrations according to grain size have been reported. We analyzed these differences in eleven catchments on the western side of the Andes, covering contrasting climates and slopes. The data include eight sand (0.5-1mm) and gravel (1-3cm) pairs and twelve sand (0.5-1mm) and pebble (5-10cm) pairs. The difference observed in three pairs can be explained by a difference in the provenance of the sand and coarser sediment. The other sand-pebble pairs show a lower 10Be concentration in the pebbles, except for one pair that shows similar concentrations. Two sand-gravel pairs show a lower 10Be concentration in the gravel and the other five pairs show a higher 10Be concentration in the gravel. Differences in climate do not reveal a particular influence on the 10Be concentration between pairs. The analysis supports a model where pebbles and gravel are mainly derived from catchment areas that are eroding at a faster rate. The five gravel samples with high 10Be concentrations probably contain gravel that were derived from the abrasion of cobbles exhumed at high elevations. In order to validate this model, further work should test if pebbles are preferentially exhumed from high erosion rate areas, and if the difference between pebbles with high 10Be concentrations and sand decreases when the erosion rate tends to be homogeneous within a catchment.

Idioma originalEnglish
Páginas (desde-hasta)33-51
Número de páginas19
PublicaciónQuaternary Geochronology
Volumen27
DOI
EstadoPublished - 1 abr 2015

Huella dactilar

pebble
sand and gravel
gravel
sand
river
erosion rate
catchment
climate
abrasion
fluvial deposit
provenance
grain size
sediment

ASJC Scopus subject areas

  • Geology
  • Stratigraphy
  • Earth and Planetary Sciences (miscellaneous)

Citar esto

Carretier, S. ; Regard, V. ; Vassallo, R. ; Aguilar, G. ; Martinod, J. ; Riquelme, R. ; Christophoul, F. ; Charrier, R. ; Gayer, E. ; Farías, M. ; Audin, L. ; Lagane, C. / Differences in 10Be concentrations between river sand, gravel and pebbles along the western side of the central Andes. En: Quaternary Geochronology. 2015 ; Vol. 27. pp. 33-51.
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title = "Differences in 10Be concentrations between river sand, gravel and pebbles along the western side of the central Andes",
abstract = "Cosmogenic nuclides in river sediment have been used to quantify catchment-mean erosion rates. Nevertheless, variable differences in 10Be concentrations according to grain size have been reported. We analyzed these differences in eleven catchments on the western side of the Andes, covering contrasting climates and slopes. The data include eight sand (0.5-1mm) and gravel (1-3cm) pairs and twelve sand (0.5-1mm) and pebble (5-10cm) pairs. The difference observed in three pairs can be explained by a difference in the provenance of the sand and coarser sediment. The other sand-pebble pairs show a lower 10Be concentration in the pebbles, except for one pair that shows similar concentrations. Two sand-gravel pairs show a lower 10Be concentration in the gravel and the other five pairs show a higher 10Be concentration in the gravel. Differences in climate do not reveal a particular influence on the 10Be concentration between pairs. The analysis supports a model where pebbles and gravel are mainly derived from catchment areas that are eroding at a faster rate. The five gravel samples with high 10Be concentrations probably contain gravel that were derived from the abrasion of cobbles exhumed at high elevations. In order to validate this model, further work should test if pebbles are preferentially exhumed from high erosion rate areas, and if the difference between pebbles with high 10Be concentrations and sand decreases when the erosion rate tends to be homogeneous within a catchment.",
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Carretier, S, Regard, V, Vassallo, R, Aguilar, G, Martinod, J, Riquelme, R, Christophoul, F, Charrier, R, Gayer, E, Farías, M, Audin, L & Lagane, C 2015, 'Differences in 10Be concentrations between river sand, gravel and pebbles along the western side of the central Andes', Quaternary Geochronology, vol. 27, pp. 33-51. https://doi.org/10.1016/j.quageo.2014.12.002

Differences in 10Be concentrations between river sand, gravel and pebbles along the western side of the central Andes. / Carretier, S.; Regard, V.; Vassallo, R.; Aguilar, G.; Martinod, J.; Riquelme, R.; Christophoul, F.; Charrier, R.; Gayer, E.; Farías, M.; Audin, L.; Lagane, C.

En: Quaternary Geochronology, Vol. 27, 01.04.2015, p. 33-51.

Resultado de la investigación: Article

TY - JOUR

T1 - Differences in 10Be concentrations between river sand, gravel and pebbles along the western side of the central Andes

AU - Carretier, S.

AU - Regard, V.

AU - Vassallo, R.

AU - Aguilar, G.

AU - Martinod, J.

AU - Riquelme, R.

AU - Christophoul, F.

AU - Charrier, R.

AU - Gayer, E.

AU - Farías, M.

AU - Audin, L.

AU - Lagane, C.

PY - 2015/4/1

Y1 - 2015/4/1

N2 - Cosmogenic nuclides in river sediment have been used to quantify catchment-mean erosion rates. Nevertheless, variable differences in 10Be concentrations according to grain size have been reported. We analyzed these differences in eleven catchments on the western side of the Andes, covering contrasting climates and slopes. The data include eight sand (0.5-1mm) and gravel (1-3cm) pairs and twelve sand (0.5-1mm) and pebble (5-10cm) pairs. The difference observed in three pairs can be explained by a difference in the provenance of the sand and coarser sediment. The other sand-pebble pairs show a lower 10Be concentration in the pebbles, except for one pair that shows similar concentrations. Two sand-gravel pairs show a lower 10Be concentration in the gravel and the other five pairs show a higher 10Be concentration in the gravel. Differences in climate do not reveal a particular influence on the 10Be concentration between pairs. The analysis supports a model where pebbles and gravel are mainly derived from catchment areas that are eroding at a faster rate. The five gravel samples with high 10Be concentrations probably contain gravel that were derived from the abrasion of cobbles exhumed at high elevations. In order to validate this model, further work should test if pebbles are preferentially exhumed from high erosion rate areas, and if the difference between pebbles with high 10Be concentrations and sand decreases when the erosion rate tends to be homogeneous within a catchment.

AB - Cosmogenic nuclides in river sediment have been used to quantify catchment-mean erosion rates. Nevertheless, variable differences in 10Be concentrations according to grain size have been reported. We analyzed these differences in eleven catchments on the western side of the Andes, covering contrasting climates and slopes. The data include eight sand (0.5-1mm) and gravel (1-3cm) pairs and twelve sand (0.5-1mm) and pebble (5-10cm) pairs. The difference observed in three pairs can be explained by a difference in the provenance of the sand and coarser sediment. The other sand-pebble pairs show a lower 10Be concentration in the pebbles, except for one pair that shows similar concentrations. Two sand-gravel pairs show a lower 10Be concentration in the gravel and the other five pairs show a higher 10Be concentration in the gravel. Differences in climate do not reveal a particular influence on the 10Be concentration between pairs. The analysis supports a model where pebbles and gravel are mainly derived from catchment areas that are eroding at a faster rate. The five gravel samples with high 10Be concentrations probably contain gravel that were derived from the abrasion of cobbles exhumed at high elevations. In order to validate this model, further work should test if pebbles are preferentially exhumed from high erosion rate areas, and if the difference between pebbles with high 10Be concentrations and sand decreases when the erosion rate tends to be homogeneous within a catchment.

KW - Andes

KW - Cosmogenic nuclide

KW - Erosion

KW - Granulometry

KW - Gravels

KW - Pebbles

KW - Sand

KW - Sediment

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U2 - 10.1016/j.quageo.2014.12.002

DO - 10.1016/j.quageo.2014.12.002

M3 - Article

AN - SCOPUS:84919933378

VL - 27

SP - 33

EP - 51

JO - Quaternary Geochronology

JF - Quaternary Geochronology

SN - 1871-1014

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