A reconstruction of the last glacial maximum (LGM) ice-surface geometry in the western Swiss Alps and contiguous Alpine regions in Italy and France
作者： Meredith A Kelly , Jean-François Buoncristiani , Christian Schlüchter , None
DOI: 10.1007/S00015-004-1109-6
关键词:
摘要: A reconstruction of the last glacial maximum (LGM) ice-surface geometry in western Swiss Alps and contiguous Alpine regions Italy France is based on detailed field mapping trimlines, ice-erosional features periglacial forms. Field data provide evidence LGM elevations ice-flow directions. The ice surface portrayed as a grid-format digital elevation model (DEM) using geographic information system (GIS) software. areas volumes selected are calculated DEM present land topography. described this paper presented conjunction with previously determined for central eastern Alps. cap was characterized by transection glaciers. Four main centers accumulation that influenced glaciers include Rhone dome, Aletsch icefield, southern Valais Mt. Blanc region. Major diffluences were located north Simplon Pass, Gd. St. Bernard Pass present-day Glacier d’Argentiere. Estimates show largest input into Valley from icefield. Centered Mattertal, icefield had at least 3010 m an thickness 1400 m. basis hypothesis to how erratic boulders transported northern foreland. Certain directions also examined possible paleo-atmospheric circulation information.
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