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|Title:||Schmidth Hammer exposure dating (SHED): Rapid age assessment of glacial landforms in the Pyrenees|
|Author:||Tomkins, Matt D.|
Dortch, Jason M.
Hughes, Philip D.
Huck, Jonny J.
Pallàs i Serra, Raimon
|Abstract:||Schmidt hammer (SH) sampling of 54 10Be-dated granite surfaces from the Pyrenees reveals a clear relationship between exposure and weathering through time (n=52, R 2=0.96, P<0.01) and permits the use of the SH as a numerical dating tool. To test this 10Be-SH calibration curve, 100 surfaces were sampled from five ice-front positions in the Têt catchment, eastern Pyrenees, with results verified against independent 10Be and 14C ages. Gaussian modelling differentiates Holocene (9.4±0.6 ka), Younger Dryas (12.6±0.9 ka), Oldest Dryas (16.1±0.5 ka), last glacial maximum (LGM; 24.8±0.9 ka) and Würmian maximum ice extent stages (MIE; 40.9±1.1 ka). These data confirm comparable glacier lengths during the LGM and MIE (~300 m difference), in contrast to evidence from the western Pyrenees (≥15 km), reflecting the relative influence of Atlantic and Mediterranean climates. Moreover, Pyrenean glaciers advanced significantly during the LGM, with a local maximum at ~25 ka, driven by growth of the Laurentide Ice Sheet, southward advection of the polar front, and a solar radiation minimum in the Northern Hemisphere. This calibration curve is available online (http://shed.earth) to enable wider application of this method throughout the Pyrenees.|
|Note:||Versió postprint del document publicat a: https://doi.org/10.1017/qua.2018.12|
|It is part of:||Quaternary Research, 2018, vol. 90, num. 1, p. 26-37|
|Appears in Collections:||Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)|
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