Open AccessObservations on Oceanography and Sedimentation at Pangnirtung Fiord, Baffin Island
Author(s) -
Robert G. Gilbert
Publication year - 1978
Publication title -
atlantic geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.471
H-Index - 19
eISSN - 1718-7885
pISSN - 0843-5561
DOI - 10.4138/1952
Subject(s) - fjord , geology , sill , oceanography , benthic zone , glacier , glacial period , turbidity current , sediment , inflow , geomorphology , structural basin , sedimentary depositional environment , geochemistry
Pangnirtung Fiord is a glacial trough draining the southwest portion of Penny Icecap, Baffin Island. Sills associated with riegels divide the fiord into four basins. Despite a large inflow of sediment from streams draining the glaciers and Penny Icecap, glacio-marine sediments have been deposited in sufficient thickness to mask glacial features only in the central portion of the fiord. A major trench in the fiord floor is believed to result from erosion by turbidity currents. A shallow sill (12 to 22 m below mean tide level) at the mouth of the fiord, a large tidal range (up to 6.7 m), and moderate fresh water inflow strongly influence circulation and stability of fiord water. Replacement of bottom water occurs frequently or continuously during the year and helps to determine the distribution of sediment. The oxygen~rich bottom water supports a large benthic fauna which severley bioturbates the sediments making them useless for the interpretation of Holocene events in the region.