High resolution seismic study of the Holocene infill of the Elkhorn Slough, central California

High resolution seismic study of the Holocene infill of the Elkhorn Slough, central California The seismic analysis of the sedimentary infill of the Elkhorn Slough, central California, reveals a succession of three main seismic units: U1, U2, U3, with their correspondent discontinuities d 2 , d 3 . These units are deposited over a paleorelief representing the channel location at least 8k years ago. The location of that paleochannel has not changed with time, but the geometry of the infilling sedimentary packages has done so through the years. Discontinuities d 2 and d 3 show a relic island or relative high in the center of the Slough that separated the sedimentation into two main small basins at least 3k years ago. There is evidence of erosion in the last two sedimentary units showing that the present erosive pattern began decades ago at minimum. We have correlated radiocarbon data of selected cores with the high resolution chirp profiles and reconstructed the infill for the Elkhorn Slough. In the most recent unit, the occurrence of numerous lateral accretion surfaces on both ends of the main channel is discussed within their environmental setting, tidal currents and the net ebb flux of the area. We have interpreted the presence of gas in the sediments of the slough, with a gas front located at the tops of units 2 and 3, which are discontinuities that reflect an effective seal for the gas. Our data shows no obvious evidence for seepage, although the shallow presence of some of the fronts points out the fragility of the environment in the present erosive conditions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Continental Shelf Research Elsevier

High resolution seismic study of the Holocene infill of the Elkhorn Slough, central California

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Abstract

The seismic analysis of the sedimentary infill of the Elkhorn Slough, central California, reveals a succession of three main seismic units: U1, U2, U3, with their correspondent discontinuities d 2 , d 3 . These units are deposited over a paleorelief representing the channel location at least 8k years ago. The location of that paleochannel has not changed with time, but the geometry of the infilling sedimentary packages has done so through the years. Discontinuities d 2 and d 3 show a relic island or relative high in the center of the Slough that separated the sedimentation into two main small basins at least 3k years ago. There is evidence of erosion in the last two sedimentary units showing that the present erosive pattern began decades ago at minimum. We have correlated radiocarbon data of selected cores with the high resolution chirp profiles and reconstructed the infill for the Elkhorn Slough. In the most recent unit, the occurrence of numerous lateral accretion surfaces on both ends of the main channel is discussed within their environmental setting, tidal currents and the net ebb flux of the area. We have interpreted the presence of gas in the sediments of the slough, with a gas front located at the tops of units 2 and 3, which are discontinuities that reflect an effective seal for the gas. Our data shows no obvious evidence for seepage, although the shallow presence of some of the fronts points out the fragility of the environment in the present erosive conditions.

Journal

Continental Shelf ResearchElsevier

Published: Mar 1, 2013

References

  • Seasonal variability of shallow biogenic gas in Chesapeake Bay
    Hagen, R.A.; Vogt, P.R.
  • A pockmark field in the Patras Gulf (Greece) and its activation during the 14/7/93 seismic event
    Hasiotis, T.; Papatheodorov, G.; Kastanos, N.; Ferentinos, G.
  • Development of a mid-Holocene estuarine basin, Rhine-Meuse mouth area, offshore the Netherlands
    Hijma, M.P.; van der Spek, A.J.F.; van Heteren, S.
  • Counter point bar deposits: lithofacies and reservoir significance in the meandering modern Peace River and ancient McMurray Formation, Alberta, Canada
    Smith, D.G.; Hubbard, S.M.; Leckie, D.A.; Fustic, M.

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