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  Bayesian estimates of marine radiocarbon reservoir effect in northern Iberia during the Early and Middle Holocene

García-Escárzaga, A., Gutiérrez-Zugasti, I., Cuenca-Solana, D., González-Morales, M. R., Hamann, C., Roberts, P., et al. (2022). Bayesian estimates of marine radiocarbon reservoir effect in northern Iberia during the Early and Middle Holocene. Quaternary Geochronology, 67: 101232. doi:10.1016/j.quageo.2021.101232.

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 Creators:
García-Escárzaga, Asier1, Author              
Gutiérrez-Zugasti, Igor, Author
Cuenca-Solana, David, Author
González-Morales, Manuel R., Author
Hamann, Christian, Author
Roberts, Patrick1, Author              
Fernandes, Ricardo1, Author              
Affiliations:
1Archaeology, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2074312              

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Free keywords: Mesolithic, Shell middens, Cantabrian region, Marine radiocarbon reservoir effect, Bayesian modelling, Marine environments, 8.2 ka event
 Abstract: Reconstructing the past variability of marine radiocarbon reservoir effects (MRE) is crucial for generating reliable chronologies for marine species and their consumers. We investigated the temporal MRE variability at the Early-to Mid-Holocene site of El Mazo (Asturias, northern Spain) by using a combination of new and previously published radiocarbon measurements on marine and terrestrial samples. The El Mazo site is characterized by overall well-defined archaeological layers of unknown occupation length with the predominant presence of two mollusc species (Patella vulgata Linnaeus, 1758 and topshell Phorcus lineatus [da Costa, 1778]) which were analysed for radiocarbon measurements. We employed the recently released IntCal20 calibration curve for the northern hemisphere and Bayesian modelling to reconstruct the site's chronology and temporal variability in MREs according to mollusc species. Obtained radiocarbon modelling results, although the estimate precision is not high, reveal a temporal variability in MREs that can be interpreted in view of known past climatic and environmental events such as the 8.2 ka event. The results also revealed differences in MREs according to mollusc species, which need to be taken into account in future chronological modelling. Overall, our results provide reference MRE values for the study of chronologies in northern Iberia during the Early-to Mid-Holocene. In this respect, a non-conservative ΔR reference for local marine samples dating earlier than c. 8.1 ka cal BP is −238 ± 28 14C years.

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Language(s): eng - English
 Dates: 2021-09-152022-02
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: 1. Introduction
2. Background
2.1. Study area: Langre beach and shell midden site of El Mazo cave
2.2. Biology and ecology of Phorcus lineatus and Patella vulgata
3. Material and methods
3.1. Modern and archaeological sample collection
3.2. Methods
3.2.1. AMS radiocarbon measurements
3.2.2. Stable carbon isotope analyses using IRMS
3.2.3. Bayesian chronological modelling
3.2.4. Bayesian mixing modelling
4. Results and discussion
4.1. Radiocarbon and δ13C differences in modern and past P. lineatus and P. vulgata
4.2. Radiocarbon chronology of archaeological contexts
4.3. ΔR variability during the mesolithic
4.4. Chronological consequences of MRE results
5. Conclusions
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.quageo.2021.101232
Other: shh3061
 Degree: -

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Title: Quaternary Geochronology
Source Genre: Journal
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Publ. Info: Elsevier
Pages: - Volume / Issue: 67 Sequence Number: 101232 Start / End Page: - Identifier: ISSN: 1871-1014
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000238470