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Expanding radiogenic strontium baseline data for central Mexican paleomobility studies

Author(s): Sofia Pacheco-Fores ; Christopher Morehart ; Elise Alonzi ; Gwyneth Gordon ; Kelly Knudson

Year: 2017

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Summary

Radiogenic strontium (87Sr/86Sr) isotope values reflect local geology and have long been used in analyses of paleomobility within Mesoamerica. Research has focused on reconstructing individuals’ residential histories by comparing strontium isotope ratios in individuals’ tooth enamel and bone with local baseline values generated from soils, plants, or local fauna. While a great deal of work has been done developing baseline values across the Maya region, work in central Mexico is predominantly focused on the Classic period urban center of Teotihuacan. This study will contribute to paleomobility research in central Mexico by analyzing a combination of modern soil (n=32), plant (n=25), and faunal (n=8) samples to generate an expected "local" range of bioavailable strontium ratios for the Epiclassic (600-900 CE) shrine site Non-Grid 4 in Lake Xaltocan in the northern Basin of Mexico. The shrine was established following the collapse of Teotihuacan, and is associated with a large deposit of human crania showing evidence of decapitation. Characterization of local signatures of strontium isotope values from the shrine indicates whether different sites within the Basin of Mexico can be distinguished isotopically. Additionally, this study serves as the first step in determining whether these sacrificed individuals were of local or non-local origin.


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Expanding radiogenic strontium baseline data for central Mexican paleomobility studies. Sofia Pacheco-Fores, Christopher Morehart, Elise Alonzi, Gwyneth Gordon, Kelly Knudson. Presented at The 81st Annual Meeting of the Society for American Archaeology, Vancouver, British Columbia. 2017 ( tDAR id: 429508)


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Spatial Coverage

min long: -107.271; min lat: 12.383 ; max long: -86.353; max lat: 23.08 ;

Record Identifiers

Abstract Id(s): 16208

Arizona State University The Andrew W. Mellon Foundation National Science Foundation National Endowment for the Humanities Society for American Archaeology Archaeological Institute of America