AMS Dating on the Shell Bar Section from Qaidam Basin, Ne Tibetan Plateau, China
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Le résumé fourni par la source
Radiocarbon dating by accelerator mass spectrometry (AMS) of the shell bar section of Qaidam Basin, NE Tibetan Plateau, shows that this section was formed between ~39.7 and ~17.5 14C kyr BP and represented the highest paleolake development period since the Late Pleistocene. It was difficult to obtain reliable dates due to the low organic carbon content, which was formed mainly by authochtonous algae-bacteria (Zhang et al. 2007a). In order to improve the dating, 14C ages of both the alkali residual and acid-soluble components of the organic carbon were measured to check the consistency of the dating results. Total organic carbon (TOC) content and stable carbon isotopes (δ13Corg) might also be used as critical references for checking the reliability of dates. For example, in our study of the shell bar section from Qaidam Basin, we found that when the TOC content was higher than 0.15% and/or δ13Corg was lower than −23, the AMS dates were reliable. AMS dating of fossil shells demonstrated that they could provide valuable age information. The ages given by fossil shells are comparable to those of bulk carbonate from a similar sampling site, and are about 15~18 kyr older than the ages given by organic matter. Due to the U/Th dating requirements and open nature of the system, we concluded that U/Th dating results are unreliable and that this technique is unsuitable for dating halite deposits from Qaidam Basin.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- AMS Dating on the Shell Bar Section from Qaidam Basin, Ne Tibetan Plateau, China
- Date Crossref
- 01/01/2008
- Éditeur
- Cambridge University Press (CUP)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Chinese Academy of Sciences pays non établi dans la noticeOrganisme public
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Nanjing Institute of Geography and Limnology pays non établi dans la noticeStructure de recherche
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Lanzhou University pays non établi dans la noticeUniversité ou école supérieure
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College of Earth Sciences and Environments Key Laboratory of Western China's Environmental Systems pays non établi dans la noticeUniversité ou école supérieure
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Key Laboratory of Western China's Environmental Systems pays non établi dans la noticeStructure de recherche
Chinese Academy of Sciences, Nanjing Institute of Geography and Limnology et Lanzhou University, avec 2 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.