Modern tidal rhythmites deposited in a deep-water estuary |
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| Authors: | E. A. Cowan J. Cai R. D. Powell K. C. Seramur V. L. Spurgeon |
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| Affiliation: | (1) Department of Geology, Appalachian State University, Boone, NC 28608, USA, US;(2) Department of Geology, Northern Illinois University, DeKalb, IL 60115, USA, US |
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| Abstract: | The sedimentary record in Muir Inlet, a macrotidal fjord in Alaska, is dominated by cyclic silt–mud rhythmites. Couplet thicknesses vary systematically in a vertical sequence and reflect a semidiurnal tidal regime. Semimonthly, monthly, bimonthly, and annual cycles can be identified both visually in cores and by spectral frequency analysis. An average annual sedimentation of 22.5 cmyr-1 occurs over a four-month meltwater season and is confirmed by 210Pb dating. These modern deep-water tidal rhythmites can be used to verify interpretations made on ancient rhythmites in the stratigraphic record, and they also provide a dating tool to interpret high latitude successions for high-resolution climate change. Received: 20 February 1997 / Revision received: 1 October 1997 |
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