Abstract
The metamorphic rocks outcropping in the Western Alps are characterized by a great variety of white marbles, which have been poorly studied in the archaeometric field even though they have been used since antiquity. Typical examples are the Arc of August of Roman times in Susa (Piedmont, Italy) and lots of monuments and historical buildings of Turin (Italy). A multi‐analytical approach based on petrographic (optical and scanning electron microscopy), electron microprobe and stable isotope analysis of Piedmont white marbles has been performed in order to carry out a detailed description, summarizing their main microtextural, mineralogical and isotopic features. Eight historical Piedmont marbles have been sampled from well‐known quarry sites belonging to different metamorphic geological units of the Western Alps (Ornavasso, Crevola, Pont Canavese, Foresto, Chianocco, Prali, Brossasco and Garessio marbles). Their different metamorphic conditions, ages and structural evolution allowed us to draw a discriminative flowchart based on microscopic and minero‐chemical data.
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