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  Initial assessment of bioavailable strontium at Oldupai Gorge, Tanzania: potential for early mobility studies

Tucker, L., Favreau, J., Itambu, M., Larter, F., Mollel, N., Mwambwiga, A., et al. (2020). Initial assessment of bioavailable strontium at Oldupai Gorge, Tanzania: potential for early mobility studies. Journal of Archaeological Science, 114: 105066, pp. 1-16. doi:10.1016/j.jas.2019.105066.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-55DC-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-65E0-A
Genre: Journal Article

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 Creators:
Tucker, Laura, Author
Favreau, Julien, Author
Itambu, Makarius, Author
Larter, Fergus, Author
Mollel, Neduvoto, Author
Mwambwiga, Aloyce, Author
Patalano, Robert, Author
Roberts, Patrick1, Author              
Soto, María, Author
Mercader, Julio1, Author              
Affiliations:
1Archaeology, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2074312              

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Free keywords: Oldupai Gorge, Bioavailable strontium, Strontium isotope analysis, Diagenesis
 Abstract: Strontium isotope analysis is a useful tool for tracing mobility and migration in past populations. For it to be employed, the 87Sr/86Sr values of the landscape must be well-understood. Bioavailable strontium is a combination of geological and atmospheric strontium available for use by plants and animals. In this study we begin mapping bioavailable strontium values around the Oldupai Gorge region so that this method may be utilized on archaeological hominins and animals in the future. We analyzed three plants from 33 localities across volcanic and metamorphic bedrock, including the regional drainage sump, Olbalbal. We found that bioavailable strontium in the region is homogeneous overall, with trends towards increasing values to the north and northeast and in Olbalbal. There was no difference between 87Sr/86Sr values of metamorphic and volcanic areas. Migrants from outside the study area with different isotopic values will be easily identifiable from the local residents. As a proof of concept, we analyzed 7 animal teeth (hippopotamus, crocodile, and equid) from Engaji Nanyori, a Bed III and IV site at Oldupai Gorge. We found that enamel and dentine which had been acetic acid treated to remove diagenetic strontium were significantly different from one another. All animals had higher 87Sr/86Sr values than the plant values, suggesting that modern and ancient bioavailable strontium values may have been different, likely due to environmental differences.

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Language(s): eng - English
 Dates: 2019-12-162020-02
 Publication Status: Published in print
 Pages: 16
 Publishing info: -
 Table of Contents: 1. Introduction
2. Background
2.1. Using strontium values at the landscape level
2.2. Study area
2.3. Geology and palaeoanthropology
2.4. Palaeoenvironment and palaeoclimate
2.5. Engaji Nanyori
2.6. Plant and animal ecology
3. Materials and methods
3.1. Plant sampling
3.2. Excavation
3.3. Plant laboratory methods
3.4. Tooth preparation
3.5. Isotope analyses
3.6. Data analyses
4. Results
4.1. Bioavailable strontium
4.1.1. Geological variation
4.1.2. Geographical variation
4.1.3. Variation between plant types
4.2. Dental results
5. Discussion
5.1. Sources of variation
5.1.1. Bedrock
5.1.2. Atmospheric strontium
5.1.3. Hydrological strontium
5.1.4. Geographical factors
5.1.5. Plant and soil types
5.2. Dental tissues
5.2.1. Diagenesis
5.2.2. Taxonomy and migration
5.3. Modern vs. ancient bioavailable strontium
6. Conclusion
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.jas.2019.105066
Other: shh2586
 Degree: -

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Title: Journal of Archaeological Science
Source Genre: Journal
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Publ. Info: London : Academic Press
Pages: - Volume / Issue: 114 Sequence Number: 105066 Start / End Page: 1 - 16 Identifier: ISSN: 0305-4403
CoNE: https://pure.mpg.de/cone/journals/resource/954922648108