caa a22 4500 47582752X CHVBK 20180406123832.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1007/s005310000126 doi (NATIONALLICENCE)springer-10.1007/s005310000126 Characterisation of marine and lacustrine sediments in a drowned thermokarst embayment, Richards Island, Beaufort Sea, Canada [Elektronische Daten] [S. Solomon, P. J. Mudie, R. Cranston, T. Hamilton, S. A. Thibaudeau, E. S. Collins] Abstract.: A multidisciplinary study was made of lakes and lagoons in a thermokarst embayment on Richards Island, Canadian Beaufort Sea, in order to investigate the response of the Mackenzie Delta shoreline to changing hydrological influences. Seismo-acoustic profiles made from an amphibious vehicle, combined with sediment core data, show that the deepest lakes contain up to 10m of transparent or stratified silty mud overlying the Kittigazuit sand basement. Palynological and microfossil data from 21 surface samples allow delineation of freshwater, saltmarsh, tidal flat and subtidal assemblages. These modern reference data allow distinction of freshwater and marine facies in the cores and subsequent interpretation of geochemical content (carbon, ammonia, sulphate). Radiocarbon dates and 137 Cs show that sedimentation rates have increased by an order of magnitude since drowning of the embayment during the past millennium, and that most of this sediment is from the Mackenzie River plume. Springer-Verlag, 2000 Beaufort Sea Mackenzie Delta Thermokarst lake Embayment Arctic Cesium radiocarbon Geochemistry Permafrost Acoustic stratigraphy nationallicence Solomon S. Geological Survey of Canada, Atlantic, Box 1006, Dartmouth, Nova Scotia, Canada, B2Y 4A2 aut Mudie P. J. Geological Survey of Canada, Atlantic, Box 1006, Dartmouth, Nova Scotia, Canada, B2Y 4A2 aut Cranston R. Geological Survey of Canada, Atlantic, Box 1006, Dartmouth, Nova Scotia, Canada, B2Y 4A2 aut Hamilton T. Geological Survey of Canada, Pacific, 9860 West Saanich Road, Sidney, British Columbia, Canada V8L 4B2 aut Thibaudeau S. A. BHP Diamonds Inc., #1102, 4920 52nd Street, Yellowknife, N.W.T., Canada aut Collins E. S. Centre for Marine Geology, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 3J5 aut https://doi.org/10.1007/s005310000126 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s005310000126 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Solomon S. Geological Survey of Canada, Atlantic, Box 1006, Dartmouth, Nova Scotia, Canada, B2Y 4A2 aut NATIONALLICENCE 700 1- Mudie P. J. Geological Survey of Canada, Atlantic, Box 1006, Dartmouth, Nova Scotia, Canada, B2Y 4A2 aut NATIONALLICENCE 700 1- Cranston R. Geological Survey of Canada, Atlantic, Box 1006, Dartmouth, Nova Scotia, Canada, B2Y 4A2 aut NATIONALLICENCE 700 1- Hamilton T. Geological Survey of Canada, Pacific, 9860 West Saanich Road, Sidney, British Columbia, Canada V8L 4B2 aut NATIONALLICENCE 700 1- Thibaudeau S. A. BHP Diamonds Inc., #1102, 4920 52nd Street, Yellowknife, N.W.T., Canada aut NATIONALLICENCE 700 1- Collins E. S. Centre for Marine Geology, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 3J5 aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer