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Effects of productivity, glaciation, and ventilation on late Quaternary sedimentary redox and trace element accumulation on the Vancouver Island margin, western Canada

dc.contributor.authorChang, Alice S.en_US
dc.contributor.authorPedersen, Thomas F.en_US
dc.contributor.authorHendy, Ingrid L.en_US
dc.date.accessioned2014-09-03T16:52:18Z
dc.date.availableWITHHELD_11_MONTHSen_US
dc.date.available2014-09-03T16:52:18Z
dc.date.issued2014-07en_US
dc.identifier.citationChang, Alice S.; Pedersen, Thomas F.; Hendy, Ingrid L. (2014). "Effects of productivity, glaciation, and ventilation on late Quaternary sedimentary redox and trace element accumulation on the Vancouver Island margin, western Canada." Paleoceanography 29(7): 730-746.en_US
dc.identifier.issn0883-8305en_US
dc.identifier.issn1944-9186en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/108369
dc.description.abstractVariations in chalcophile and redox‐sensitive trace elements are examined at high‐resolution intervals from a ~50 kyr long sediment core (MD02‐2496) from the Vancouver Island margin. Enrichments of Ag, Cd, Re, U, and Mo above lithogenous levels, signifying sedimentary suboxia and anoxia, occurred during the early Holocene and Bølling/Allerød, and during warm interstadial events of Marine Isotope Stage (MIS) 3. Down‐core trace element profiles co‐vary with productivity proxy records (opal, CaCO 3 , and marine organic carbon), and with sedimentary nitrogen isotope ratios, which reflect variably enriched nitrate upwelled from intermediate waters that were transported northward from the Eastern Tropical North Pacific. The similarity of the MD02‐2496 record with records from the southern portion of the California Current System (CCS), and to the Greenland ice core oxygen isotope record during warm climate intervals, suggests that sedimentary redox conditions along the California Current responded to local productivity, to North Atlantic climate change and to tropical Pacific surface water processes via long‐distance teleconnections. Concentrations of trace elements and productivity proxies were relatively depleted during the Younger Dryas, cool stadial events of MIS 3, and in two episodes of glaciomarine sedimentation from ~14.7 to 30.5 kyr BP (last glacial maximum, LGM), and from 44 to 50.4 kyr BP. Cordilleran Ice Sheet advancement onto the Vancouver Island continental shelf during the LGM led to intervals of increased terrigenous sedimentation and greatly reduced productivity not seen in the southern portion of the CCS, and along with ventilation of North Pacific Intermediate Waters, resulted in brief sedimentary oxic conditions. Key Points Trace elements co‐vary with marine productivity proxies during warm climates Productivity controls pore water oxygen and sedimentary redox conditions Cordilleran ice sheet directly affected productivity and sedimentary redoxen_US
dc.publisherScandinavian University Pressen_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otherNortheast Pacific Oceanen_US
dc.subject.otherSedimentary Redoxen_US
dc.subject.otherTrace Elementsen_US
dc.subject.otherProductivityen_US
dc.subject.otherCordilleran Glaciationen_US
dc.titleEffects of productivity, glaciation, and ventilation on late Quaternary sedimentary redox and trace element accumulation on the Vancouver Island margin, western Canadaen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelAtmospheric and Oceanic Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/108369/1/palo20124.pdf
dc.identifier.doi10.1002/2013PA002581en_US
dc.identifier.sourcePaleoceanographyen_US
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