Sediment accumulation, stratigraphic order, and the extent of time-averaging in lagoonal sediments: a comparison of Pb-210 and C-14/amino acid racemization chronologies

Matthew A. Kosnik*, Quan Hua, Darrell S. Kaufman, Atun Zawadzki

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    28 Citations (Scopus)
    35 Downloads (Pure)

    Abstract

    Carbon-14 calibrated amino acid racemization (14C/AAR) data and lead-210 (210Pb) data are used to examine sediment accumulation rates, stratigraphic order, and the extent of time-averaging in sediments collected from the One Tree Reef lagoon (southern Great Barrier Reef, Australia). The top meter of lagoonal sediment preserves a stratigraphically ordered deposit spanning the last 600 yrs. Despite different assumptions, the 210Pb and 14C/AAR chronologies are remarkably similar indicating consistency in sedimentary processes across sediment grain sizes spanning more than three orders of magnitude (0.1–10 mm). Estimates of long-term sediment accumulation rates range from 2.2 to 1.2 mm yr−1. Molluscan time-averaging in the taphonomically active zone is 19 yrs, whereas below the depth of final burial (~15 cm), it is ~110 yrs/5 cm layer. While not a high-resolution paleontological record, this reef lagoon sediment is suitable for paleoecological studies spanning the period of Western colonization and development. This sedimentary deposit, and others like it, should be useful, albeit not ideal, for quantifying anthropogenic impacts on coral reef systems.

    Original languageEnglish
    Pages (from-to)215-229
    Number of pages15
    JournalCoral Reefs
    Volume34
    Issue number1
    DOIs
    Publication statusPublished - Mar 2015

    Bibliographical note

    Copyright the Author(s) 2014. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • Carbonate sediment
    • Late Holocene
    • One Tree Reef lagoon
    • Bivaliva
    • Abranda jeanae
    • GREAT-BARRIER-REEF
    • OF-THORNS STARFISH
    • DEATH ASSEMBLAGES
    • IDENTIFYING OUTLIERS
    • RECURRING OUTBREAKS
    • GEOLOGICAL EVIDENCE
    • DAVIES REEF
    • GEOCHRONOLOGY
    • REASSESSMENT
    • DISSOLUTION

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