Multilayered artifacts in the pre-Columbian metallurgy from the North of Peru |
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Authors: | Roberto Cesareo Angel D Bustamante Julio S Fabian Sandra Del Pilar Zambrano Walter Alva Luis Z Chero Maria C Del Carmen Espinoza Rosendo R Rodriguez Marco F Seclen Fidel V Gutierrez Edgard B Levano Juan A Gonzales Marcia A Rizzutto Enrico Poli Cristiane Calza Marcelino Dos Anjos Renato Pereira De Freitas Ricardo T Lopes Carlos Elera Izumi Shimada Victor Curay Maria G Castillo Giovanni E Gigante Gabriel M Ingo Fabio Lopes Ulla Holmquist David Diestra |
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Institution: | 1. Dipartimento di Matematica e Fisica, Università di Sassari, Sassari, Italy 2. Istituto per lo studio dei materiali nanostrutturati, CNR-Montelibretti, via Salaria km. 29. 5, 00015, Monterotondo, Rome, Italy 3. Universidad Nacional Mayor de San Marcos, Lima, Peru 4. Museo “Tumbas Reales de Sipán”, Lambayeque, Peru 5. Instituto de Fisica, Universidade de S?o Paulo, S?o Paulo, SP, Brazil 6. Associacion cultural and Museum Enrico Poli, Lima, Peru 7. COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil 8. Museo de Sicán”, Ferra?afe, Peru 9. Istituto Nacional de Cultura, Piura, Peru 10. Dipartimento di Scienze di Base e Applicate, Sapienza Università di Roma, Rome, Italy 11. Universidade de Londrina, Londrina, PA, Brazil 12. Museo Larco, Lima, Peru
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Abstract: | Three types of alloys were recognized when analyzing pre-Columbian artifacts from the North of Peru: gold, silver, and copper alloys; gilded copper and silver; silvered copper; tumbaga, i.e., copper or silver enriched on gold at the surface by depletion gilding. In this paper, a method is described to differentiate gold alloys from gilded copper and from copper–gold tumbaga, and silver alloys from silvered copper and copper–silver tumbaga. This method is based on the use of energy-dispersive X-ray fluorescence, i.e., on a sophisticated analysis of XRF-spectra carrying out an accurate determination of Cu(K α /K β ), Ag(K α /K β ), Au(L α /L β ), and Au-L α /Cu-K α or Ag-K α /Cu-K α ratios. That implies a dedicated software for the quantitative determination of the area of X-ray peaks. This method was first checked by a relevant number of standard samples and then it was applied to pre-Columbian alloys from the North of Peru. |
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