CGRG Bibliography of Canadian Geomorphology
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Author : Biksham, G.; and d'Anglejan, B
Date : 1989
Title : Rate of sedimentation and geochemistry of Southeastern Hudson Bay, Canada
Publication : Sediment and the Environment. Proceedings of a Symposium held in Baltimore; Maryland. International Association of Hydrological Sciences, Washington, DC. Publication
Issue : 184:
Page(s) : 27-36
Abstract
Suspended particulate matter (SPM) of Hudson Bay was estimated by collecting 60 samples at three stations and four different depths. The mean SPM in the study area was 0.642 mg/L. The sediments collected in traps indicated that the rate of accumulation increased with depth. Seasonal variation provided a rate that was 2 to 4 times higher during the month of May. The rate of sedimentation estimated by Pb-210 data was 51 to 63 mm/100 yr, which is in general agreement with the trap data. Carbon and nitrogen together constituted more than 50% of SPM. In the trap sediments, carbon ranged from 17 to 38% and nitrogen from 1.6 to 6.3%. In underlying sediments, the carbon was very uniform at a mean 1.96% of total, of which more than 85% was in the organic fraction. Elemental analysis on core sediments showed uniform bulk chemistry. High Si/Al ratio indicated that the source of sediments to the Bay may include other than fluvial transport. The amorphous silica content in the sediments ranged from 0.77 to 2.36%, which is 2 to 8% of total silica; in trap sediments amorphous silica content was more than 6%. Size studies indicated the breakdown of SPM, resulting in collection of relatively more fine sediments in the deeper traps. A gradual increase of sand fraction in the last 1000 years indicates a change in supply of the sediments to the Hudson Bay
Bibliography of Canadian Geomorphology