Fig. 11From: Petrographic and geochemical analyses to characterise the source of built historical natural stones — a case study of the volcanic stones from historical quarries and Baoguosi Temple in the city of Ningbo, Chinaa: Primitive mantle-normalised spider-grams for trace elements (Source: the authors, after Sun and McDonough 1989). b: Chondrite-normalised rare earth elements diagram (Source: the authors, after Boynton 1984)Back to article page