Obsidian circulation in south-central Andes after ca. 1100 BP: A contribution based on geochemical studies in Argentinean Southern Puna Plateau

The results obtained are compared with those available for other contemporary sites and Formative contexts (ca. 3000-1100 BP) within the area of study. A preliminary discussion is presented on the basis of the environmental, political and social tendencies that characterized the times after ca. 1100 BP at the micro-region and south-central Andes.