An assessment of solubility profiling as a decontamination procedure for the 87Sr/86Sr analysis of archaeological human skeletal tissue |
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| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. Center for development and Research, China Geological Survey, Beijing 100037, China;3. Key Laboratory of Geochemical Exploration, Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000, China;1. Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico;2. Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana Unidad Cuajimalpa, Ciudad de México, Mexico;3. Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;4. Dirección de Investigación y Posgrado, Instituto Mexicano del Petróleo, Ciudad de México, Mexico;5. Instituto Nacional de Antropología e Historia, Templo Mayor, Ciudad de México, Mexico;6. Department of Physical Anthropology, Instituto Nacional de Antropología e Historia (INAH), Ciudad de México, Mexico;7. Universidad del Claustro de Sor Juana, Ciudad de México, Mexico |
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| Abstract: | 87Sr/86Sr of archaeological skeletal tissues are increasingly used to reconstruct residential mobility and migration, but the post mortem preservation of biogenic Sr is often uncertain. Sample pre-treatment regimes, notably ‘solubility profiling’, have been used to remove diagenetic Sr prior to analysis, but doubts remain over their effectiveness. The investigation examines the effectiveness of solubility profiling by comparing the Sr content and 87Sr/86Sr composition of bone, dentine and enamel from two archaeological juveniles (Blackfriars, UK) before and after attempted decontamination. For both individuals leached samples of cortical bone and dentine had similar 87Sr/86Sr to those of soil leachates from the burial site, and are therefore thought to represent diagenetic 87Sr/86Sr. For both individuals samples of treated dental enamel have 87Sr/86Sr considerably more or less radiogenic than the soil leachates and other tissues. These are considered representative of biogenic Sr, i.e. Sr acquired in vivo. In effect, solubility profiling should have resulted in 87Sr/86Sr that were similar for all 3 tissues types and close to those of the untreated enamel. Experimental results show that tooth enamel 87Sr/86Sr remained largely unaffected by solubility profiling, and the process did not significantly alter the final 87Sr/86Sr of either dentine or cortical bone. It is concluded that the technique was ineffective in facilitating the recovery of biogenic Sr from these tissues. |
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