00000nam 2200000zi 4500 9.894727 CaOODSP 20221107173826 m o d f cr mn||||||||| 201216t20202020oncab ob f000 0 eng d 9780660369334 CaOODSP eng rda CaOODSP eng eng fre n-cn-ns ln----- Fs97-6/3415E-PDF Zions, Vanessa S., author. Grain size and trace metal concentrations on the Scotian Shelf : results from the Thebaud offshore gas production platform and Gully MPA / by Vanessa S. Zions, Brent A. Law and Timothy G. Milligan. [Ottawa] : Fisheries and Oceans Canada = Pêches et océans Canada, 2020. ©2020 1 online resource (viii, 124 pages) : illustrations (some colour), colour maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian technical report of fisheries and aquatic sciences, 1488-5379 ; 3415 Includes bibliographical references (pages 10-12). "Core samples were collected for sediment grain size and trace metal analysis from the Scotian Shelf in the summers of 2006 and 2007 from the vicinity of Thebaud gas production platform and the Gully Marine Protected Area (MPA). At Thebaud samples were collected along transects radiating from the platform in east, west, north-east and south-east directions. In the Gully, transects followed the canyon axis in a north-west to south-east orientation. All bottom sediment core samples were collected using a slow-corer which preserved the sediment-water interface. Cores were sectioned into 2 cm layers for sediment grain size and trace metal analysis. Sediment analysis from Thebaud revealed a median diameter (d50) that ranged from 158.14-385.03 μm with 0.20-6.04% of material residing in the mud fraction (<63 μm). The Gully had median diameters between 131.06-408.10 μm where mud made up 0.11-5.50% of material. For metals of interest (Zn, Fe, Mn, Ba, and Sr) concentrations were plotted against aluminum for grain size normalization and compared to background concentrations collected from sandy sediments throughout the Scotian and Newfoundland Shelfs. Elevated metal concentrations were measured at Thebaud throughout the sampling program, which may be indicative of drilling waste and produced water impacts. Elevated levels of metals were not detected in the Gully suggesting there was little evidence of hydrocarbon activities in the MPA"--Abstract, page vii. Includes abstracts in English and French. Marine sediments Scotian Shelf. Sediments (Geology) Heavy metal content Scotian Shelf. Offshore gas well drilling Environmental aspects Scotian Shelf. Drilling muds Environmental aspects Scotian Shelf. Sédiments marins Néo-écossaise, Plateforme. Sédiments (Géologie) Teneur en éléments traces métalliques Néo-écossaise, Plateforme. Gaz naturel Puits Forage offshore Aspect de l'environnement Néo-écossaise, Plateforme. Boues de forage Aspect de l'environnement Néo-écossaise, Plateforme. Canada. Department of Fisheries and Oceans, issuing body. Bedford Institute of Oceanography, issuing body. Canadian technical report of fisheries and aquatic sciences ; 3415. (CaOODSP)9.504449 PDF 5.70 MB https://publications.gc.ca/collections/collection_2020/mpo-dfo/Fs97-6-3415-eng.pdf