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POST-GLACIAL PALEOCEANOGRAPHIC HISTORY OF SAANICH INLET, BRITISH COLUMBIA, BASED ON FORAMINIFERAL PROXY DATA

2002; Cushman Foundation for Foraminiferal Research; Volume: 32; Issue: 2 Linguagem: Inglês

10.2113/0320110

1943-264X

R. Timothy Patterson, Arun Kumar,

Plant and Fungal Species Descriptions

Research Article| April 01, 2002 POST-GLACIAL PALEOCEANOGRAPHIC HISTORY OF SAANICH INLET, BRITISH COLUMBIA, BASED ON FORAMINIFERAL PROXY DATA R. Timothy Patterson; R. Timothy Patterson 1 Ottawa Carleton Geoscience Centre & Department of Earth Sciences, College of Natural Sciences, Carleton University, 2240 Herzberg Building, 1125 Colonel By Drive, Ottawa, Ontario, K1S 5B6, CANADA 1E-mail: tpatters@ccs.carleton.ca Search for other works by this author on: GSW Google Scholar Arun Kumar Arun Kumar Ottawa Carleton Geoscience Centre & Department of Earth Sciences, College of Natural Sciences, Carleton University, 2240 Herzberg Building, 1125 Colonel By Drive, Ottawa, Ontario, K1S 5B6, CANADA Search for other works by this author on: GSW Google Scholar Journal of Foraminiferal Research (2002) 32 (2): 110–125. https://doi.org/10.2113/0320110 Article history received: 27 Nov 2000 accepted: 15 Jul 2001 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation R. Timothy Patterson, Arun Kumar; POST-GLACIAL PALEOCEANOGRAPHIC HISTORY OF SAANICH INLET, BRITISH COLUMBIA, BASED ON FORAMINIFERAL PROXY DATA. Journal of Foraminiferal Research 2002;; 32 (2): 110–125. doi: https://doi.org/10.2113/0320110 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract Five benthic foraminiferal biofacies characterize the late Pleistocene to Recent succession at ODP Sites 1033B and 1034B (Leg 169S) in Saanich Inlet, southern Vancouver Island, British Columbia. These faunas document three distinct paleoceanographic phases in the evolution of this inlet. From the latest Pleistocene, ~14,000 years BP, to the earliest Holocene, the distribution of benthic foraminifera (Cribroelphidium excavatum [Biofacies 5]), Islandiella norcrossi [Biofacies 4], and Nonionella stella [Biofacies 3]) in Saanich Inlet was strongly controlled by the influence of cold, low-salinity waters associated with deglaciation. Early Holocene sediments are characterized by Stainforthia feylingi Biofacies 2. Despite a shallower sill depth at the entrance of Saanich than exists today sedimentological and foraminiferal evidence indicate that bottom waters were oxygenated. The foraminiferal fauna indicates that oxygen levels varied from a minimum low oxic (1.5–3 ml/l [67–133 μM]) level early on to suboxic (0.3–1.5 ml/l [13.3–67 μM]) conditions up section where sediments become progressively more laminated. During the early Holocene air temperatures in the region were up to 4°C warmer, and it was much drier than at present. The resultant reduced freshwater flow into the southern Strait of Georgia was conducive to the free exchange of Saanich Inlet bottom waters with those of well-oxygenated Haro Strait.After 7000 years BP the climate in the region cooled and, as the influence of freshwater from Strait of Georgia increased, oxygenation of Saanich bottom waters became a rare occurrence. Finely-laminated sediments characterized mid-Holocene to Recent sediments in the inlet reflecting the development of full anoxic conditions at depth. The Lobatula fletcheri–Buccella frigida Biofacies 1 characterizing this interval is allochthonous and derived by down-slope transport from shallower, more oxygenated regions of Saanich Inlet. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.