Correlations between Holocene flood tidal delta and barrier island inlet fill sequences: Back Sound-Shackleford Banks, North Carolina

Authors

  • WILLIAM M. BERELSON,

    1. Department of Geology, Duke University, Durham, North Carolina 27708, U.S.A.
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      Department of Geological Sciences, University of Southern California, Los Angeles, CA 90089–0741, U.S.A.

  • S. DUNCAN HERON JR

    1. Department of Geology, Duke University, Durham, North Carolina 27708, U.S.A.
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ABSTRACT

Large, well-developed flood tidal deltas on a barrier island coastline generally indicate a wave-dominated, microtidal sedimentary regime. Vibracores in a lagoon behind the barrier island Shackleford Banks, North Carolina contain an upward fining sequence of coarse-medium, very shelly sand, medium-fine laminated sand, fine-very fine cross-laminated sand and marsh mud. This sequence is interpreted as being a flood tidal delta deposit based on analogy with modern flood tidal delta sediments and represents lagoonal deposition in response to a migrating or closing inlet. The sand facies defined in lagoonal vibracores is found to be continuous beneath a lagoonal marsh and correlative with inlet sections identified in Shackleford Banks drill holes. The correlation of flood tidal delta deposits with inlet sequences in this microtidal environment indicates a close relationship between barrier and backbarrier inlet controlled sedimentation.

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