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(Article of periodic en Anglais - 2014)

Document title

Using in situ cosmogenic 10Be to identify the source of sediment leaving Greenland

Authors(s) and Affiliation(s)

NELSON A.H. (1) ; BIERMAN P.R. (2) ; SHAKUN J.D. (3) ; ROOD D.H. (4 5) ;
(1) Dep. of Geology, Univ. of Vermont, Burlington, ETATS-UNIS
(2) Dept. of Geology and Rubenstein School of Environment and Natural Resources, Univ. of Vermont s, Burlington, ETATS-UNIS
(3) Dept. of Earth and Environmental Sciences, Boston College, Chestnut Hill, ETATS-UNIS
(4) Scottish Universities Environmental Research Centre (SUERC), East Kilbride, ROYAUME-UNI
(5) Earth Research Inst., Univ. of California, Santa Barbara, ETATS-UNIS

Abstract

The AA. use the concentration of in situ 10Be in quartz isolated from fluvial and morainal sand to trace sediment sources and to determine the relative contribution of glacerized and deglaciated terrain to Greenland's sediment budget. They sampled along the western, eastern, and southern margins of the Greenland Ice Sheet. The isotope concentration in sediment sourced from non-glacerized terrain is higher than in sediment sourced from glacerized terrain because the non-glacerized landscape has been exposed to cosmic radiation since early Holocene deglaciation. Sediment from glacerized areas contains a low, but measurable concentration of 10Be that probably accumulated at depth during a prolonged period of exposure, probably before the establishment of the Greenland Ice Sheet. The concentration of 10Be in mixed fluvial sediment and in terrace sediment is low, and similar to the concentration in sediment from glacerized areas, which indicates that the Greenland Ice Sheet is the dominant source of sediment moving through the landscape outside the glacial margin in the areas sampled

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2014, vol. 39, no8 [pp. 1087-1100]

Bibliographic references : 3 p.

Collation : 9 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3565

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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