Douka, K., Hedges, R. E M. and Higham, T. F G. (2010). Improved AMS 14C dating of shell carbonates using high-precision x-ray diffraction and a novel density separation protocol (CarDS) . Radiocarbon 52 (2). Vol 52(2), pp. 735-751.
 Title The title of the publication or report |
Improved AMS 14C dating of shell carbonates using high-precision x-ray diffraction and a novel density separation protocol (CarDS) | |||
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Issue The name of the volume or issue |
Radiocarbon 52 (2) | |||
Series The series the publication or report is included in |
Radiocarbon | |||
Volume Volume number and part |
52 (2) | |||
Number of Pages The number of pages in the publication or report |
637 | |||
Page Start/End The start and end page numbers. |
735 - 751 | |||
Biblio Note This is a Bibliographic record only. |
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Publication Type The type of publication - report, monograph, journal article or chapter from a book |
Journal | |||
Abstract The abstract describing the content of the publication or report |
One critical variable in the successful application of radiocarbon dating is the effective removal of carbonaceous contaminants. In the case of marine carbonates, contamination appears usually in the form of secondary low-magnesium calcite, the stable polymorph of calcium carbonate and byproduct of the post-mortem recrystallization or replacement of the autochthonous phase, originally in the form of high-magnesium calcite or aragonite. Depending on the nature of the depositional environment, the secondary phase may be contemporary in age with the original shell carbonate and may have even been derived from it by dissolution-recrystallization processes, or can be an exogenous contaminant of younger or older age. The limited ability of current pretreatment protocols to detect and remove the secondary mineralogical phases prior to dating carbonates has been one of the reasons marine shell and coral 14C determinations are often difficult to validate in terms of their reliability. We have developed a new pretreatment protocol designed to achieve greater reliability and accuracy in the dating of this material. The method entails 2 steps. The first one involves the improved detection and quantification of secondary calcite in aragonite using X-ray diffraction, at a precision of ~0.1% and ~0.8%, respectively. Next, where this is required, a novel density separation step using non-toxic heavy liquids (CarDS) is applied to the diagenetic sample. This enables the clear separation of calcite and aragonite, with only the latter kept for dating. The new steps, screening and separation, have been applied to standard and archaeological examples and initial results suggest that they are successful and reproducible. The method and initial results are described. | |||
Year of Publication The year the book, article or report was published |
2010 | |||
Locations Any locations covered by the publication or report. This is not the place the book or report was published. |
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Source Where the record has come from or which dataset it was orginally included in. |
BIAB
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Relations Other resources which are relevant to this publication or report |
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Created Date The date the record of the pubication was first entered |
22 Feb 2013 |
