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A radiocarbon‐dated gelifluction lobe in the Nachvak Fiord area, northern Labrador, Canada
Author(s) -
Evans David J. A.,
Rogerson Robert J.
Publication year - 1988
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3290130708
Subject(s) - radiocarbon dating , geology , solifluction , lobe , silt , fjord , physical geography , geomorphology , paleontology , glacial period , geography , medicine , anatomy
Radiocarbon dates obtained on organic materials overridden by a gelifluction lobe allow some estimate of past gelifluction rates for a site near sea level in northern Labrador. The calculated mean gelifluction rate for the last 400 years is in the order of 8 mm yr −1 , somewhat higher than the average gelifluction rate described from other locations in the Canadian Arctic. The lobe contains two lithostratigraphic units: an inner diamicton, probably representing a buried gelifluction lobe, overlain by a silt/clay unit which may have been emplaced abruptly as a solifluction sheet. Mean creep rates for these units were in the order of 5 mm yr −1 and 15 mm yr −1 respectively. The area is presently subsiding, and transgressive beach material overlies terrestrial organics which are approximately 300 years old.