Fig. 6: Rb/Sr–K₂O/CaO diagrams showing distinct geochemical fields for the three gabbroic stones used in early 20th-century Japanese architecture. | npj Heritage Science

Fig. 6: Rb/Sr–K₂O/CaO diagrams showing distinct geochemical fields for the three gabbroic stones used in early 20th-century Japanese architecture.

From: Non-destructive identification of gabbroic building stone using portable X-ray fluorescence (pXRF) analysis

Fig. 6

The plots of the three gabbroic stones, Ukigane, Nakoso, and Matsuba, are clearly separated based on pXRF values plotted before (left) and after (right) adjustment using WD-XRF bulk compositions, demonstrating distinct geochemical fields for each. The result indicates that the adjustment has minimal effect on stone discrimination.

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