INSTITUTO DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Isótopos de estroncio y escala de las sociedades andinas del sur: un nuevo proyecto
AUGUSTO TESSONE; PAULA NOVELLINO; VÍCTOR DURÁN; RAMIRO BARBERENA; FRANCISCA SANTANA SAGREDO; CARINA LLANO; PETRUS LE ROUX; ALEJANDRA GASCO; KELLY J. KNUDSON
Taller; II Taller de Arqueología e Isótopos Estables en el Sur de Sudamérica; 2017
The goal of this research is to present the geological frame of reference for bioavailable strontium isotopes (87Sr/86Sr) in the southern Andes of Argentina and Chile. This stage forms part of a larger project that tackles the scale of human paleomobility and ecological complementarity between the Andean highlands and the surrounding lowlands. At a temporal level, the focus is on the last 2300 years. This framework is based on the combination of geological data with isotope results for rodent samples.We develop an isotopic assessment of scale of human mobility in a mountain landscape combining strontium and oxygen isotopes. Human samples from the main geological units and periods within the last two millennia are selected. This is based on strontium results for human bone and teeth samples from Mendoza Province (Argentina) that allow targeting life-history changes in spatial residence. The 87Sr/86Sr values from human samples indicate residential stability within geological regions along life history. Despite the large socio-economic changes recorded, 87Sr/86Sr values indicate a persisting scenario of low systematic mobility between the different geological regions. When comparing strontium and oxygen values for the same human samples, we record a divergent pattern: while d18O values for samples from distant regions overlap widely, there are important differences in strontium values. Our results suggest that strontium isotope values provide the most germane means to track patterns of human occupation of distinct regions in complex geological landscapes, offering higher spatial resolution than oxygen isotopes in the southern Andes.