Current Pretreatment Methods for AMS Radiocarbon Dating at the Oxford Radiocarbon Accelerator Unit (Orau)

Brock, Fiona; Higham, Thomas; Ditchfield, Peter; Ramsey, Christopher Bronk

doi:10.1017/s0033822200045069

Cited by 760 publications

(617 citation statements)

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“…another and a more direct indicator of collagen quality is the atomic ratio of C/N, which in the extracted collagen should stay in the interval of 2 .9-3 .5 [van Klinken et al . 1999;Brock et al . 2010] .…”

Section: Featurementioning

confidence: 99%

Chronometry of Late Eneolithic and ‘Early Bronze’ Cultures in the Middle Dniester Area: Investigations of the Yampil Barrow Complex

Goslar

Klochko

Kośko

et al. 2015

Baltic-Pontic Studies

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The paper discusses the 2010-2015 studies of the radiocarbon chronology of Podolia 'barrow cultures' on the left bank of the middle dniester . The studies have relied on series of 14 C dates for the Klembivka 1, Pidlisivka 1, Porohy 3a and Prydnistryanske 1 sites determined in Kyiv and Poznań laboratories . They are the first attempt to construct a regional ('Yampil') radiocarbon scale for 'Early Bronze' funerary rites (4th/3rd-2nd millennium BC) as practised by barrow builders -the communities of the Tripolye and Yamnaya culturesand the secondary barrow users -the designers of necropolises located on barrows -belonging to the Catacomb, Babyno and Noua cultures .

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Section: Featurementioning

confidence: 99%

Chronometry of Late Eneolithic and ‘Early Bronze’ Cultures in the Middle Dniester Area: Investigations of the Yampil Barrow Complex

Goslar

Klochko

Kośko

et al. 2015

Baltic-Pontic Studies

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“…A small fraction was 14 C dated according to the ORAU routine pretreatment protocol (Brock et al 2010). Following this, 100 mg underwent twice the new CarDS protocol.…”

Section: Fiji-1mentioning

confidence: 99%

“…This sample was previously conventionally dated in the Waikato Radiocarbon Laboratory to 4110 ± 60 BP (Wk-7589) (Nunn and Peltier 2001), and more recently using AMS with a range of dates, spanning from 4357 ± 26 to 4472 ± 38 BP (F Petchey, personal communication). In ORAU, it was dated 3 times; once using the routine preparation method as described by Brock et al (2010) and twice following the CarDS protocol.…”

Section: Fiji-1mentioning

confidence: 99%

“…The distinct calcite peak at 29.4 2 was extremely broad (Figure 4), as above. A shell fragment of ~200 mg was crushed and 20 mg of powder was dated following the rou- tine preparation method for carbonates (Brock et al 2010) and gave a 14 C age of 32,890 ± 170 BP (OxA-19616). The rest of the material underwent the CarDS protocol, which led to a reduction in calcite concentration from ~80% to <10% and a younger age of 31,840 ± 270 BP (OxA-19795).…”

Section: Bomb-16mentioning

confidence: 99%

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Improved AMS¹⁴C Dating of Shell Carbonates Using High-Precision X-Ray Diffraction and a Novel Density Separation Protocol (Cards)

2010

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ABSTRACT. 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 14 C 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. We have applied the new steps, screening and separation, on standard and archaeological examples and our initial results suggest that it is successful and reproducible. In this paper, we describe the method and initial results.

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“…1;Moskal-del Hoyo and Kozłowski, 2009;Brock et al, 2010;Michczyński, 2011: 40-41). However, in our opinion the most significant part of the problem with the dating of plant material results from the fact that they are still very rarely identified taxonomically (Damblon and Haesaerts, 2002;Moskal-del Hoyo and Kozłowski, 2009).…”

Section: Introductionmentioning

confidence: 99%

Benefits and weaknesses of radiocarbon dating of plant material as reflected by Neolithic archaeological sites from Poland, Slovakia and Hungary

et al. 2017

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Radiocarbon dating of the plant material is important for chronology of archaeological sites. Therefore, a selection of suitable plant samples is an important task. The contribution emphasizes the necessity of taxonomical identification prior to radiocarbon dating as a crucial element of such selection. The benefits and weaknesses of dating of taxonomically undetermined and identified samples will be analysed based on several case studies referring to Neolithic sites from Hungary, Slovakia and Poland. These examples better illustrate the significance of the taxonomical identification since plant materials of the Neolithic age include only a limited number of cultivated species (e.g. hulled wheats) and typically do not contain remains of late arrived plants (e.g. Carpinus betulus and Fagus sylvatica). For more accurate dating results cereal grains, fruits and seeds, which reflect a single vegetative season, are preferred. Among charred wood, fragments of twigs, branches and external rings should mainly be taken into account, while those of trunks belonging to long-lived trees should be avoided. Besides the absolute chronology of archaeological features and artefacts, radiocarbon dating of identified plant remains might significantly contribute to the history of local vegetation and food production systems.

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Current Pretreatment Methods for AMS Radiocarbon Dating at the Oxford Radiocarbon Accelerator Unit (Orau)

Abstract: ABSTRACT. In this paper, we summarize the main chemical pretreatment protocols currently used for AMS radiocarbon dating at the Oxford Radiocarbon Accelerator Unit, updating the protocols last described by Hedges et al. (1989).

Cited by 760 publications

References 42 publications

Chronometry of Late Eneolithic and ‘Early Bronze’ Cultures in the Middle Dniester Area: Investigations of the Yampil Barrow Complex

Chronometry of Late Eneolithic and ‘Early Bronze’ Cultures in the Middle Dniester Area: Investigations of the Yampil Barrow Complex

Improved AMS¹⁴C Dating of Shell Carbonates Using High-Precision X-Ray Diffraction and a Novel Density Separation Protocol (Cards)

Benefits and weaknesses of radiocarbon dating of plant material as reflected by Neolithic archaeological sites from Poland, Slovakia and Hungary

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Current Pretreatment Methods for AMS Radiocarbon Dating at the Oxford Radiocarbon Accelerator Unit (Orau)

Abstract: ABSTRACT. In this paper, we summarize the main chemical pretreatment protocols currently used for AMS radiocarbon dating at the Oxford Radiocarbon Accelerator Unit, updating the protocols last described by Hedges et al. (1989).

Cited by 760 publications

References 42 publications

Chronometry of Late Eneolithic and ‘Early Bronze’ Cultures in the Middle Dniester Area: Investigations of the Yampil Barrow Complex

Chronometry of Late Eneolithic and ‘Early Bronze’ Cultures in the Middle Dniester Area: Investigations of the Yampil Barrow Complex

Improved AMS14C Dating of Shell Carbonates Using High-Precision X-Ray Diffraction and a Novel Density Separation Protocol (Cards)

Benefits and weaknesses of radiocarbon dating of plant material as reflected by Neolithic archaeological sites from Poland, Slovakia and Hungary

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Resources

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Improved AMS¹⁴C Dating of Shell Carbonates Using High-Precision X-Ray Diffraction and a Novel Density Separation Protocol (Cards)