Abstract
While the use of radiogenic strontium isotope values to examine paleomobility is increasingly common in the Andes, and beyond, many questions about baseline variability remain. To better understand baseline radiogenic strontium isotope compositions in the Andes, we present new 87Sr/86Sr values from Peruvian soil samples. Modern soil samples were collected from agricultural fields from the following areas in central and southern Peru: Arequipa, Atico, Camaná, Chala, Cusco, Ica, Ilo, Lima, Mejía, Moquegua, Nazca, Ocoña, Palpa, Pisco, Puno, Tacna, and Yauca. Samples were partially dissolved to better approximate the bioavailable strontium. Radiogenic strontium isotope values from the partially dissolved soil samples range from 87Sr/86Sr = 0.70202 to 0.71894 and, for all soil samples, have a mean of 87Sr/86Sr = 0.70773 ± 0.00166 (1σ, n = 114). In general, the 87Sr/86Sr values measured for soil samples collected from modern agricultural fields reflect the expected 87Sr/86Sr values based on bedrock geology. Comparing our new soil data with published radiogenic strontium isotope data for bedrock, soil, water, and faunal samples provides constraints on the regions in the Andes that can, and cannot, be distinguished through radiogenic strontium isotope analysis.
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Acknowledgments
This project would not have been possible without generous funding to White, Knudson, and Longstaffe from the Social Science and Humanities Research Council of Canada and with grants to Knudson from the Institute for Social Science Research at Arizona State University and the School of Human Evolution and Social Change at Arizona State University. We are grateful to Dr. Jean-Francois Millaire of The University of Western Ontario and Lic. Estaurdo La Torre for sample collection in the field. In the Archaeological Chemistry Laboratory at Arizona State University, we are grateful for the laboratory assistance of Allisen Dahlstedt and Alejandra Gonzalez and the mapmaking expertise of Elise Alonzi. We also thank Drs. Ariel Anbar and Gwyneth Gordon of the W.M. Keck Foundation for Environmental Biogeochemistry for laboratory access and expertise. Finally, the first author would like to thank a number of scholars for fruitful discussions about isotopic research in the Andes, particularly Drs. Corina Kellner and Bethany Turner.
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Knudson, K.J., Webb, E., White, C. et al. Baseline data for Andean paleomobility research: a radiogenic strontium isotope study of modern Peruvian agricultural soils. Archaeol Anthropol Sci 6, 205–219 (2014). https://doi.org/10.1007/s12520-013-0148-1
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DOI: https://doi.org/10.1007/s12520-013-0148-1