Sr/Sr variability in Puerto Rico: geological complexity and the study of paleomobility |
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| Authors: | William J Pestle Antonio Simonetti L Antonio Curet |
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| Institution: | 1. Department of Anthropology, University of Miami, Merrick Hall 102E, Coral Gables, FL 33124, United States;2. Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, IN 46556, United States;3. Department of Anthropology, Field Museum of Natural History, 1400 S. Lake Shore Drive, Chicago, IL 60605, United States |
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| Abstract: | The temptation to use biogeochemical techniques to resolve issues of paleomigration is evident and well intentioned. Knowledge of radiogenic strontium isotope baselines in a region of interest is a sine qua non of such archaeological studies of paleomobility. Here, we present the first detailed study of baseline 87Sr/86Sr values for the island of Puerto Rico. The high degree of 87Sr/86Sr variability present in this corpus of modern Puerto Rican bedrock and terrestrial malacological samples (0.70406–0.70909) is a testament to the complex geology of that island. This diversity of 87Sr/86Sr values makes parsing issues of origin a difficult and highly contingent task. Given these complexities, regional studies seeking to assess paleomigration by such isotopic means should proceed with a great deal of caution. |
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| Keywords: | 87Sr/86Sr Caribbean Puerto Rico Paleomobility Paleomigration |
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