Study of compositional and luminescence properties of calcite in lapis lazuli for provenance investigations of archaeological findings

Marta Magalini · Laura Guidorzi · Alessandro Re · M. Marabotto · Alessandro Borghi · Massimo M. V. Vidale +9 more

6 citations0/0 files storedThe European Physical Journal Plus

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Cultural Heritage Materials Analysis Mineralogy and Gemology Studies Building materials and conservation

Abstract

Abstract In this study, calcite crystals within 42 lapis lazuli reference rocks coming from four distinct mining regions (in present-day Afghanistan, Tajikistan, Siberia and Myanmar) were characterised in terms of their compositional and luminescence properties in order to identify potential provenance markers. A non-destructive approach based on Ion Beam Analysis was employed, in particular using μ-Particle Induced X-rays Emission (μ-PIXE) and μ-Ion Beam Induced Luminescence (μ-IBIL). The results indicate that calcite crystals in Afghan rocks are characterised by the highest quantity of Mg and Mn; whereas, Siberian calcite exhibit the highest Sr content. The application of Principal Component Analysis also enhanced the possibility of discriminating between the Myanmar and Tajik rocks, as well as between the four provenances in general, by exploiting the compositional variability of Mg, Mn, Sr and Y elements. Regarding the luminescence properties, notable differences in the intensity ratio between the 360 nm and the 620 nm luminescence bands were detected among the provenances. In the second part of this study, the new results were employed to infer the origin of the raw material of certain archaeological findings discovered in two different historical sites: four lapis lazuli fragments from Shahr-i Sokhta (Iran, 3rd millennium BCE) and a lapis lazuli tessera from the city of Tanis (Egypt, 1050–700 BCE). The results of the analysis indicate that, among the four provenances considered in the reference rocks database, the best compatibility of the data from both case studies is found with the Afghan dataset. This suggests that the area of Afghanistan is the most probable source for the raw materials of the investigated findings.

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2010The Guelph PIXE software package IV 1968Lapis Lazuli: The Early Phases of Its Trade 2013Development of a multi-detector and a systematic imaging system on the AGLAE external beam 2015Programs for visualization, handling and quantification of PIXE maps at the AGLAE facility 2009Multitechnique characterization of lapis lazuli for provenance study 2003Cathodoluminescence of synthetic and natural calcite: the effects of manganese and iron on orange emission 2013New markers to identify the provenance of lapis lazuli: trace elements in pyrite by means of micro-PIXE 2016Protocol for lapis lazuli provenance determination: evidence for an Afghan origin of the stones used for ancient carved artefacts kept at the Egyptian Museum of Florence (Italy)

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