Abstract
Internal tidal currents are the likely cause of erosional features such as current ripples, sand waves, and truncated bedding horizons on the sediment cap of Horizon Guyot. Current meter data obtained over a 9 month period in 1983–1984 at about 213 m above the guyot show that the tidal currents are anomalously strong for mid-oceanic depths, probably the result of topographically induced generation of internal tidal waves. An analysis of the initiation of motion of the foraminiferal sand by the internal tidal currents indicates that these currents, particularly during the months of March–May, are likely to transport the surficial sediment and generate the observed bedforms.
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References
Backman RT (1984) Intratest porosity in foraminifera. Journal Sedimentary Petrology 54:257–262
Cacchione DA, Wunsch CI (1974) Experimental study of internal waves over a slope. Journal of Fluid Mechanics 66:223–239
Earle MD (1975) Current measurements in the eastern central North Pacific Ocean. Deep Sea Research 22:875–881
Grant WD, Madsen OS (1982), Moveable bed roughness in unsteady oscillatory flow. Journal Geophysical Research 87:469–481
Gould WJ, Hendry R, Huppert HE (1981) An abyssal topographic experiment. Deep-Sea Research 28A:409–440
Hayes S (1979) Benthic current observations at DOMES sites A, B, and C in the tropical North Pacific Ocean. In: Bischoff J, Piper DZ (eds) Marine Geology and Oceanography of the Pacific Manganese Nodules Province. Plenum, New York, pp 83–112
Heathershaw AD (1981) Comparisons of measured and predicted sediment transport rates in tidal currents. In: Nittrouer CA (ed) Sedimentary Dynamics of Continental Shelves-Developments in Sedimentology 32, Elsevier, New York, pp 75–104
Heezen BC, Hollister CD (1971) The Face of the Deep. Oxford University Press, New York, 654 pp
Lonsdale P, Normark WR, and Newman WA (1972) Sedimentation and erosion on Horizon Guyot. Geological Society America Bulletin 83:289–316
Lonsdale P, Spiess FN (1977) Abyssal bedforms explored with a deeply towed instrument package. Marine Geology 23:57–75
Noble M, Cacchione D, Schwab W (1988) Observations of strong mid-Pacific internal tides above Horizon Guyot. Journal Physical Oceanography (in press)
Owens WB, Hogg NG (1980) Oceanic observations of stratified Taylor columns. Deep-Sea Research 27A:1029–1045
Roberts DG, Hogg NG, Bishop DG, Flewellen CG (1974) Sediment distribution around moated seamounts in the Rockall Trough. Deep-Sea Research 21:175–184
Rubin DM, McCulloch DS (1980) Single and superimposed bedforms: a synthesis of San Francisco Bay and flume observations. Sedimentary Geology 26:207–231
Schwab WC, Lee HJ, Kayen RE, Quinterno PJ, Tate GB (1988) Erosion and mass-wasting on Horizon Guyot, Mid-Pacific Mountains. Geo-Marine Letters 8:xx-xx
Smith JD (1977) Modeling of sediment transport on continental shelves. In: Goldberg ED, McCave IN, O'Brien JJ, Steele JH (eds) The Sea, vol. 6, Wiley Interscience, New York, pp 539–577
Soulsby RL (1983) The bottom boundary layer of shelf seas. In: Johns B (ed) Physical Oceanography of Coastal and Shelf Seas. Elsevier, Amsterdam, pp 189–266
Southard JB, Cacchione DA (1972) Experiments on bottom sediment movement by breaking internal waves. In: Swift DIP, Duane DB, Pilkey OH (eds) Shelf Sediment Transport. Dowden, Hutchinson and Ross, Stroudsburg, PA, pp 83–98
Wunsch CI (1969) Progressive internal waves on slopes. Journal of Fluid Mechanics 35:131–144
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Cacchione, D.A., Schwab, W.C., Noble, M. et al. Internal tides and sediment movement on Horizon Guyot, Mid-Pacific Mountains. Geo-Marine Letters 8, 11–17 (1988). https://doi.org/10.1007/BF02238001
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DOI: https://doi.org/10.1007/BF02238001