Emissions from Pre-Hispanic Metallurgy in the South American Atmosphere

François de Vleeschouwer (1) , Heleen Vanneste (1) , Dmitri Mauquoy (2) , Natalia Piotrowska (3) , Fernando Torrejón (4) , Thomas Roland (5, 6) , Ariel Stein (7) , Gaël Le Roux (1)

1 LEFE - Laboratoire Ecologie Fonctionnelle et Environnement
2 University of Aberdeen
3 Silesian University of Technology
4 Universidad de Concepción - University of Concepcion [Chile]
5 University of Exeter
6 University of Southampton
7 ARL - NOAA Air Resources Laboratory

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.

Mots clés: Tierra del Fuego; Dust; Metals; Pre-hispanic metallurgy; Andes; Atmospheric long-range transport

Domaines: Biodiversité et Ecologie; Environnement et Société; Milieux et Changements globaux

François de Vleeschouwer, Heleen Vanneste, Dmitri Mauquoy, Natalia Piotrowska, Fernando Torrejón, et al.. Emissions from Pre-Hispanic Metallurgy in the South American Atmosphere. PLoS ONE, 2014, vol. 9, pp. 1-13. ⟨10.1371/journal.pone.0111315⟩. ⟨hal-01095695⟩