A New Approach for Provenance Studies of Archaeological Finds: Inferences from Trace Elements in Carbonate Minerals of Alpine White Marbles by a Bench-to-Top μ -XRF Spectrometer

  • Vaggelli G
  • Serra M
  • Cossio R
  • et al.
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Abstract

The metamorphic rocks outcropping in the Western Alps are characterised by a great variety of white marbles which have been used since the antiquity. This variety mostly includes nine historical Piedmont white marbles (Ornavasso, Candoglia, Crevola, Pont Canavese, Foresto, Chianocco, Prali, Brossasco, and Garessio marbles) coming from well-known quarry sites and belonging to different metamorphic geological units of the Western Alps. The petrographical, minerochemical, and C–O isotopic data of these white marbles have been integrated with CaO and trace element (Fe, Mn, and Sr) concentration determined on single crystals of carbonate minerals (i.e., calcite and/or dolomite) by means of a bench-to-top µ-XRF spectrometer. Principal component analysis and hierarchical cluster analysis were performed on a data set of 178 observations containing CaO, Fe, Mn, and Sr concentration as well as the maximum grain size (MGS), δ 18 O and δ 13 C. The use of only five selected variables (CaO, Fe, Mn, Sr, and δ 18 O) has provided the correct allocation of each individual observation to its relevant class. Therefore, this approach based mostly on a noninvasive µ-XRF determination will be useful to define the provenance of unknown marbles of alpine origin used in antiquity for cultural heritage.

Figures

  • Figure 1: Tectonic sketch map of the Western Alps. The locations of the historical quarries are reported. Modified after [20]. Legend: 1 = Postorogenic continental andmarine terrigenous deposits of Plio-Pleistocene toQuaternary age. 2 = late orogeny fore-deep turbiditic deposits of Oligo-Miocene age. 3 = Apennine chain. 4 = South-Alpine domain. 5 = Canavese zone. 6 = Austroalpine domain. 7–11 = Penninic domain: 7 = upper Piedmont unit; 8 = lower Piedmont unit; 9 = internal crystalline massifs; 10 = Briançonnais zone; 11 = lower penninic unit. 12 = Helvetic domain. 13 = tectonic lines: PF = Penninic front; SL = Simplon line; ECL = external Canavese line; ICL = internal Canavese line; IL= insubric line; RF = Rio Freddo line.
  • Table 1: List of studied alpine marbles: type, microscopic features, and C–O isotope from [20].
  • Table 2: Measured 𝜇-XRF elements: mean and standard deviation (𝜎) values are calculated from a variable number of diffraction free spectra reported in # points column.
  • Figure 2: Two elements scatter plot (a): Fe versus Sr; (b) Fe versus Mn.
  • Table 3: Correlation matrix of the whole set of variables.
  • Table 5: Eigenvalues (in descending order) and extracted eigenvectors (PC1 and PC2 coefficients referring to the first 2 eigenvalues are reported in bold) belonging to the correlation matrix: PCA performed on 5 variables (𝛿18O, CaO, Fe, Sr, and Mn).
  • Table 4: Eigenvalues (in descending order) and extracted eigenvectors (PC1 and PC2 coefficients referring to the first 2 eigenvalues are reported in bold) belonging to the correlation matrix: PCA performed on 4 variables (CaO, Fe, Sr, and Mn).
  • Figure 3: PCA performed on (a) 3 variables (Mn, Fe, and Sr); (b) 4 variables (CaO, Mn, Fe, and Sr); (c) 5 variables (𝛿18O, 𝛿13C, Mn, Fe, and Sr); (d) 5 variables (𝛿18O, CaO, Mn, Fe, and Sr). Single scatter points refer to bottom and left scale (PC scores); element vectors refer to right and top scale (PC coefficients).

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APA

Vaggelli, G., Serra, M., Cossio, R., & Borghi, A. (2014). A New Approach for Provenance Studies of Archaeological Finds: Inferences from Trace Elements in Carbonate Minerals of Alpine White Marbles by a Bench-to-Top μ -XRF Spectrometer. International Journal of Mineralogy, 2014, 1–11. https://doi.org/10.1155/2014/217916

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