TY - JOUR
T1 - Sediment accumulation, stratigraphic order, and the extent of time-averaging in lagoonal sediments
T2 - a comparison of 210Pb and 14C/amino acid racemization chronologies
AU - Kosnik, Matthew A.
AU - Hua, Quan
AU - Kaufman, Darrell S.
AU - Zawadzki, Atun
N1 - Funding Information:
The author list is alphabetical following the lead author, and each coauthor contributed time, thought, and effort to this paper. We thank: E. Connolly, P. Hallam, J. Martinelli, P. McCracken, and M. Philips for assistance collecting samples; J. Reiffel and R. Graham for logistical assistance and hospitality at One Tree Island Research Station; S. Duce for the Mastersizer analyses; H. Bell for the excavation sediment weights; K. Cooper for the AAR analyses, and J. Goralewski for the Pb labwork; and K. Wilson and two anonymous reviewers for comments on the manuscript. Funding: Australian Research Council Future Fellowship FT0990983 (Fieldwork and MAK support); Australian Institute of Nuclear Science and Engineering Awards #12/093 and #13/528 (Pb and C analyses); and US National Science Foundation grant EAR-09-9415 (AAR analyses). Open access made possible in part by a contribution by the Department of Biological Sciences, Macquarie University. 210 210 14
Publisher Copyright:
© 2014, The Author(s).
PY - 2015/3
Y1 - 2015/3
N2 - 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.
AB - 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.
KW - Abranda jeanae
KW - Bivaliva
KW - Carbonate sediment
KW - Late Holocene
KW - One Tree Reef lagoon
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U2 - 10.1007/s00338-014-1234-2
DO - 10.1007/s00338-014-1234-2
M3 - Article
AN - SCOPUS:84925483347
SN - 0722-4028
VL - 34
SP - 215
EP - 229
JO - Coral Reefs
JF - Coral Reefs
IS - 1
ER -