Sedimentation, stratigraphy and physical properties of sediment on the Juan de Fuca Ridge

Sedimentation near mid-ocean ridges may differ from pelagic sedimentation due to the influence of the ridges' rough topography on sediment deposition and transport. This study explores whether the near-ridge environment responds to glacial-interglacial changes in climate and oceanography. New b...

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Bibliographic Details
Published in:Marine geology 2016-10, Vol.380, p.163-173
Main Authors: Costa, K.M., McManus, J.F., Boulahanis, B., Carbotte, S.M., Winckler, G., Huybers, P.J., Langmuir, C.H.
Format: Article
Language:English
Subjects:
Coarsening
Density
Juan de Fuca Ridge
Marine
Oxygen isotope stratigraphy
Pacific Ocean
Physical properties
Ridges
Sediment density
Sedimentation
Sedimentation rates
Sediments
Topography
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Summary:Sedimentation near mid-ocean ridges may differ from pelagic sedimentation due to the influence of the ridges' rough topography on sediment deposition and transport. This study explores whether the near-ridge environment responds to glacial-interglacial changes in climate and oceanography. New benthic δ18O, radiocarbon, multi-sensor track, and physical property (sedimentation rates, density, magnetic susceptibility) data for seven cores on the Juan de Fuca Ridge provide multiple records covering the past 700,000years of oceanographic history of the Northeast Pacific Ocean. Systematic variations in sediment density and coarse fraction correspond to glacial-interglacial cycles identified in benthic δ18O, and these observations may provide a framework for mapping the δ18O chronostratigraphy via sediment density to other locations on the Juan de Fuca Ridge and beyond. Sedimentation rates generally range from 0.5 to 3cm/kyr, with background pelagic sedimentation rates close to 1cm/kyr. Variability in sedimentation rates close to the ridge likely reflects remobilization of sediment caused by the high relief of the ridge bathymetry. Sedimentation patterns primarily reflect divergence of sedimentation rates with distance from the ridge axis and glacial-interglacial variation in sedimentation that may reflect carbonate preservation cycles as well as preferential remobilization of fine material. •Density shows clear glacial-interglacial cycling•The density cycles can be used to generate stratigraphic age models•Sediment redistribution is enhanced in the near-ridge environment
ISSN:0025-3227
1872-6151
DOI:10.1016/j.margeo.2016.08.003