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De Vleeschouwer, François; Vanneste, Heleen; Mauquoy, Dmitri; Piotrowska, Natalia; Torrejón, Fernando; Roland, Thomas; Stein, Ariel; Le Roux, Gaël (2014)
Publisher: Public Library of Science
Journal: PLoS ONE
Languages: English
Types: Article
Subjects: Research Article, Earth Sciences, [ SDE.BE ] Environmental Sciences/Biodiversity and Ecology, Atmospheric Dispersion Modeling, Ecology and Environmental Sciences, Metals, Atmospheric Science, Geology, Andes, Volcanology, [ SDE.ES ] Environmental Sciences/Environmental and Society, Physical Sciences, Milieux et Changements globaux, Archaeology, Applied Chemistry, Cenozoic Era, Dust, Chemistry, Geochronology, Radioactive Carbon Dating, Geochemistry, Biodiversité et Ecologie, Environnement et Société, Atmospheric Dynamics, Volcanoes, Terrestrial Environments, Pre-hispanic metallurgy, Environmental Impacts, Medicine, Biogeochemistry, Holocene Epoch, Atmospheric Physics, Geologic Time, Q, R, Social Sciences, Science, Archaeological Dating, Atmospheric Circulation, Atmospheric long-range transport, Tierra del Fuego, [ SDE.MCG ] Environmental Sciences/Global Changes
International audience; Metallurgical activities have been undertaken in northern South America (NSA) for millennia. However, it is still unknown how far atmospheric emissions from these activities have been transported. Since the timing of metallurgical activities is currently estimated from scarce archaeological discoveries, the availability of reliable and continuous records to refine the timing of past metal deposition in South America is essential, as it provides an alternative to discontinuous archives, as well as evidence for global trace metal transport. We show in a peat record from Tierra del Fuego that anthropogenic metals likely have been emitted into the atmosphere and transported from NSA to southern South America (SSA) over the last 4200 yrs. These findings are supported by modern time back-trajectories from NSA to SSA. We further show that apparent anthropogenic Cu and Sb emissions predate any archaeological evidence for metallurgical activities. Lead and Sn were also emitted into the atmosphere as by-products of Inca and Spanish metallurgy, whereas local coal-gold rushes and the industrial revolution contributed to local contamination. We suggest that the onset of pre-Hispanic metallurgical activities is earlier than previously reported from archaeological records and that atmospheric emissions of metals were transported from NSA to SSA.
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