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Tidal cycles in the sediments of Santa Barbara Basin

¹ Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0524, USA
² Department of Geological Sciences, Indiana University, Bloomington, Indiana 47405-1405, USA
³ Universidad de Concepción, Departmento Oceanografía, Centro FONDAP-COPAS, Casilla 160-C, Concepción-3, Chile

The sediments of Santa Barbara Basin, a valuable source of information about the history of the California Current, show cyclic deposition in three properties here investigated: varve thickness, total organic carbon (TOC) accumulation, and fish-scale abundance. We analyzed the record since A.D. 1350 for varves, A.D. 1120 for TOC, and A.D. 1200 for fish scales. Prominent periods are 169 yr, 93 yr, 51.4 yr, 17.7 yr (varve thickness), 124 yr, 56 yr, 37.4 yr (TOC flux), and 103 yr, 128 yr (fish-scale abundance). A surprising number of the varve and TOC cycles can be interpreted as deriving from the common tidal cycles, i.e., the 4.425 yr perigee period (describing the changing distance between Earth and Moon) and the 18.6 yr lunar nodal period (which pertains to the lineup of Earth, Moon, and Sun). We suggest that the record of the basin is partly a result of pulsed sedimentation aligned with tides. These findings support the hypothesis that a considerable portion of sediment destined for deposition in the center of the basin goes through a phase of shallow storage on the shelf where it can be remobilized through storms and tides. Mechanisms calling on tidally pulsed productivity or tidally influenced climate change are not excluded, but are considered less attractive than remobilization. Fish-scale cycles may reflect the influence of solar forcing.

Key Words: recent varves • organic-matter deposition • fish scales • sediment cycles • tidal cycles • Santa Barbara Basin • California

This article has been cited by other articles:

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