Sediment mixing and stratigraphic disorder revealed by the age-structure of Tellina shells in Great Barrier Reef sediment

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dc.contributor.authorKosnik, MAen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorKaufman, DSen_AU
dc.contributor.authorWust, RAJen_AU
dc.date.accessioned2008-04-23T03:47:01Zen_AU
dc.date.accessioned2010-04-30T05:03:33Zen_AU
dc.date.available2008-04-23T03:47:01Zen_AU
dc.date.available2010-04-30T05:03:33Zen_AU
dc.date.issued2007-09en_AU
dc.date.statistics2007-09en_AU
dc.description.abstractRadiocarbon-calibrated amino acid racemization ages of 250 individually dated Tellina shells from two sediment cores are used to quantify molluscan time averaging with increasing burial depth in the shallow-water carbonate lagoon of Rib Reef, central Great Barrier Reef, Australia. The top 20 cm of sediment contain a distinct, essentially modern assemblage with a median age of only 5 yr. Sediment between 20 and 125 cm are age-homogeneous and significantly older than the surface sediment (median age 189 yr). Shell age distributions within layers indicate that the top 125 cm of lagoonal sediment is thoroughly mixed on a subcentennial scale. Shell size is an important correlate of shell half-life and an important determinant of the inferred age of sedimentary layers. These results illustrate the importance of bioturbation in these environments, indicate that age estimates in this depositional setting are sensitive to specimen choice, and document a size-dependent bias in death assemblage formation. © 2007, Geological Society of Americaen_AU
dc.identifier.citationKosnik, M. A., Hua, Q., Jacobsen, G. E., Kaufman, D. S., & Wust, R. A. (2007). Sediment mixing and stratigraphic disorder revealed by the age-structure of Tellina shells in Great Barrier Reef sediment. Geology, 35(9), 811-814. doi:10.1130/G23722A.1en_AU
dc.identifier.govdoc1231en_AU
dc.identifier.issn0091-7613en_AU
dc.identifier.issue9en_AU
dc.identifier.journaltitleGeologyen_AU
dc.identifier.pagination811-814en_AU
dc.identifier.urihttp://dx.doi.org/10.1130/G23722A.1en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1112en_AU
dc.identifier.volume35en_AU
dc.language.isoenen_AU
dc.publisherGeological Society of Americaen_AU
dc.subjectSedimentsen_AU
dc.subjectMixingen_AU
dc.subjectReefsen_AU
dc.subjectShellsen_AU
dc.subjectAustraliaen_AU
dc.subjectAge dependenceen_AU
dc.titleSediment mixing and stratigraphic disorder revealed by the age-structure of Tellina shells in Great Barrier Reef sedimenten_AU
dc.typeJournal Articleen_AU
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