Ice-Core Evidence of Earliest Extensive Copper Metallurgy in the Andes 2700 Years ago

Authors

• Anja Eichler Laboratory of Environmental Chemistry, Paul Scherrer Institute, CH-5232 Villigen, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland. anja.eichler@psi.ch
• Gabriela Gramlich Laboratory of Environmental Chemistry, Paul Scherrer Institute, CH-5232 Villigen, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland
• Thomas Kellerhals Laboratory of Environmental Chemistry, Paul Scherrer Institute, CH-5232 Villigen, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland
• Leonhard Tobler Laboratory of Environmental Chemistry, Paul Scherrer Institute, CH-5232 Villigen, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland
• Thilo Rehren UCL Institute of Archaeology, 31-34 Gordon Square, London WC1H 0PY, UK; College for Humanities and Social Sciences, HBKU Doha, Qatar
• Margit Schwikowski Laboratory of Environmental Chemistry, Paul Scherrer Institute, CH-5232 Villigen, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, CH-3012 Bern, Switzerland; Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland