Neoglacial glacier variations

The term 'neoglaciation' was introduced by Porter and Denton (1967). The term refers to the readvance or formation of glaciers after their minimum extent during the early Holocene. The start of neoglaciations varies significantly from region to region (e.g. Denton and Karlen, 1973; Grove, 1988). On Baffin Island, Arctic Canada, the glacier margins were behind present positions at 5000yrbp, with short readvances before about 3200yrbp. Neoglacial advances in North America are reported from the Canadian Cordillera, the US Rocky Mountains, the Brooks Range in Alaska, and the Torngat Mountains in Labrador. The Neoglacial chronologies have been reconstructed from marginal moraine sequences and material subsequently overrun by glaciers. Investigations of the present glaciers in Scandinavia suggest that most, if not all, glaciers were totally melted once or several times during the Holocene (e.g. Karlen, 1988). In New Zealand, strati-graphic sequences provide a pattern of Neoglacial variations in close agreement with the European records (Gellatly et al., 1988). The Neoglacial history of the Antarctic ice sheet is characterized by relatively small fluctuations, although much research is still to be done.

Was this article helpful?

0 0

Post a comment