Identifying outliers and assessing the accuracy of amino acid racernization measurements for geochronology: II. data screening

Simple item page
dc.contributor.authorKosnik, MAen_AU
dc.contributor.authorKaufman, DSen_AU
dc.date.accessioned2009-11-11T04:12:35Zen_AU
dc.date.accessioned2010-04-30T05:03:39Zen_AU
dc.date.available2009-11-11T04:12:35Zen_AU
dc.date.available2010-04-30T05:03:39Zen_AU
dc.date.issued2008-11en_AU
dc.date.statistics2008-11en_AU
dc.description.abstractAmino acid racemization (AAR) is a cost-effective method for dating the large numbers of specimens required for time-averaging studies. Because the aim of time-averaging studies is to determine the structure of the age distribution, any data screening must be done cautiously and systematically. Methods to quantitatively assess the quality of AAR data and to identify aberrant specimens are under-developed. Here we examine a variety of screening criteria for identifying outliers and determining the suitability of specimens for numerical dating including: high serine concentrations (modern contamination), covariance of aspartic acid (Asp) and glutamic acid (Glu) concentrations (diagenetic influences), replication of measurements (specimen heterogeneity), and the relation between Asp and Glu d/l values (internal consistency). This study is based on AAR analyses of 481 late Holocene shells of four molluscan taxa (Ethalia, Natica, Tellina, and Turbo) collected from shallow sediment cores from the central Great Barrier Reef. Different outliers are flagged by the different screening criteria, and 6% of specimens were found to be unsuitable for time-averaging analyses based on screening the raw AAR data. We recommend a hybrid approach for identifying outliers and specimens for numerical dating. © 2008, Elsevier Ltd.en_AU
dc.identifier.citationKosnik, M. A., & Kaufman, D. S. (2008). Identifying outliers and assessing the accuracy of amino acid racernization measurements for geochronology: II. data screening. Quaternary Geochronology, 3(4), 328-341. doi:10.1016/j.quageo.2008.04.001en_AU
dc.identifier.govdoc1238en_AU
dc.identifier.issn1871-1014en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleQuaternary Geochronologyen_AU
dc.identifier.pagination328-341en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.quageo.2008.04.001en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2271en_AU
dc.identifier.volume3en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectAmino acidsen_AU
dc.subjectRacemizationen_AU
dc.subjectCalibrationen_AU
dc.subjectAge estimationen_AU
dc.subjectScreeningen_AU
dc.subjectMolluscsen_AU
dc.titleIdentifying outliers and assessing the accuracy of amino acid racernization measurements for geochronology: II. data screeningen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.79 KB
Format:
Plain Text
Description:
Download
Collections
Journal Articles