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  Spatial variation in bioavailable strontium isotope ratios (87Sr/86Sr) in Kenya and northern Tanzania: Implications for ecology, paleoanthropology, and archaeology

Janzen, A., Bataille, C., Copeland, S. R., Quinn, R. L., Ambrose, S. H., Reed, D., et al. (2020). Spatial variation in bioavailable strontium isotope ratios (87Sr/86Sr) in Kenya and northern Tanzania: Implications for ecology, paleoanthropology, and archaeology. Palaeogeography, Palaeoclimatology, Palaeoecology, 560: 109957, pp. 1-18. doi:10.1016/j.palaeo.2020.109957.

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 Creators:
Janzen, Anneke1, Author              
Bataille, Clément, Author
Copeland, Sandi R., Author              
Quinn, Rhonda L., Author
Ambrose, Stanley H., Author
Reed, Denné, Author
Hamilton, Marian, Author
Grimes, Vaughan, Author              
Richards, Michael P., Author              
le Roux, Petrus, Author
Roberts, Patrick1, Author              
Affiliations:
1Archaeology, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2074312              

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Free keywords: Africa, Isoscape, Geology, Machine learning, Mobility, Provenience
 Abstract: Eastern Africa is a key region for studying archaeological, palaeontological, and ecological movements. This region hosts critical developments in hominin and human evolution, the dispersal of food-producing populations across the continent, and some of the largest known contemporary mammalian migrations on the planet. Strontium isotope analysis of biominerals such as tooth enamel, eggshell, and other tissues in modern animals have been used to reconstruct migration, residential mobility, and provenience. The diverse geologies of Kenya and Tanzania, ranging from the Archaean Basement System rocks of the Tanzanian Craton to the recent volcanics of rift valleys, make it a highly promising area for mobility and provenience studies using strontium isotope ratios (87Sr/86Sr). Nevertheless, the application of strontium isotope analysis to reconstruct migration and individual mobility has been limited in the region due to the lack of a map predicting biologically available (bioavailable) 87Sr/86Sr. We present bioavailable 87Sr/86Sr data from a variety of modern and archaeological materials throughout Kenya and northern Tanzania. We show that 87Sr/86Srr of living organisms in the study area range from as low as 0.70439 for samples collected from Neogene volcanics to 0.72796 for samples collected from Precambrian Basement System rocks. We also present an 87Sr/86Sr map (isoscape) of Kenya and Tanzania developed using a machine-learning framework and a compilation of bioavailable 87Sr/86Sr data from Africa. This map provides the first predictions of bioavailable 87Sr/86Sr for East Africa, and represents a crucial resource for future work on ancient and modern animal and human mobility.

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Language(s): eng - English
 Dates: 2020-08-092020-12-15
 Publication Status: Published in print
 Pages: 18
 Publishing info: -
 Table of Contents: 1. Introduction
2. Regional Setting: The geological variability of Kenya and northern Tanzania and existing 87Sr/86Sr data
3. Factors driving variability in bioavailable 87Sr/86Sr
4. Methods
4.1. Sample collection
4.2. Sample analyses
4.3. Isoscape Development
5. Results
5.1. Bioavailable 87Sr/86Sr in Kenya and Tanzania
5.2. Model results
6. Discussion
7. Conclusions
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.palaeo.2020.109957
Other: shh2685
 Degree: -

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Title: Palaeogeography, Palaeoclimatology, Palaeoecology
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 560 Sequence Number: 109957 Start / End Page: 1 - 18 Identifier: ISSN: 0031-0182
CoNE: https://pure.mpg.de/cone/journals/resource/954925431351