CGRG Bibliography of Canadian Geomorphology
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Author : Blasco, S.M.; Tucker, E.B.; Forbes, D.L.; Covill, B.; Harmes, R.A.; Bennett, J.R.; and Craymer, M.
Date : 2005.
Title : -A eustatic sea level curve for the Bermuda Seamount - a reference curve for East Coast Canada.
Publication : Proceedings of the 12th Canadian Coastal Conference. Dartmouth, Nova Scotia. November 6-9, 2005.
Issue :
Page(s) :
Abstract
The Bermuda seamount is primarily subject to eustatic sea level rise. Glacioisostatic forebulge effects are minimal, and vertical motion GPS data can be used to correct for minimal tectonic motion. A wellconstrained eustatic curve for Bermuda could provide a reference curve for the eustatic component of sea level rise for east coast Canada. Bermuda has a well-documented history of sea level rise data from the often-cited Neumann curve of 1971 to the most recent works by Javaux (1999) and Volbrecht (1996). These historic data are being supplemented by new data to generate a more constrained eustatic sea level curve for the past 7 ka. Three submerged forests at Gurnet Rock, Harrington Sound and Well Bay in water depths of 9, 6 and 1.5 m respectively are under investigation. Several in-situ tree stumps with associated forest floor organic layers have been located at each site. In addition, a submerged lake basin identified by a laterally extensive thick peat section is being mapped at Ferry Reach in water depths of 6 m. These sites are being surveyed with multibeam sonar for accurate water/sample depths and for 3-D paleogeographic reconstructions. Surveyed sites are being mapped and excavated using scuba diving techniques. In-situ tree stump, peat, organic and carbonate samples were recovered from these sites and were submitted for carbon dating. Radiocarbon ages range from 79100 to 1430 BP and are consistently younger with decreasing water depths. Three-D timeseries paleogeographic reconstructions facilitate site-flooding geometry relative to rising water levels. Initial results indicate Bermuda sea level has risen 9m over the past 7 ka with decreasing rate over time.
Bibliography of Canadian Geomorphology