LA-ICP-MS Chemical Analysis Profiles of Paraiba Tourmaline, Batalha Mine Sample No. GRS-Ref2976.2
Fig. Par 52
Photograph of a multicolored tourmaline analyzed by LA-ICP-MS. Two profiles of craters are visible in the picture. One targeting the chemical composition in the “neon”-blue color zone (See Fig. Par42) and one through the purple core.
Fig. Par53a-d Variation of Pb-, Mg-, Be- and Sb-concentrations
The maximum of the Mg-concentrations are well correlated with the end of the “neon”-blue growth phase. During the “neon”-blue growth phase, Zn- and Mg-concentrations are depleted. The increase in Mg-concentrations is in coincidence with the first major increase in concentrations of Mn. This observation confirms the findings of another sample (Fig. Par33a). The following observation do also confirm the previous findings in the first sample:
1.) Pb and be are enriched in the “neon”-blue growth zone (Fig. Par53b, d) 2.) Zn increases in the green rim along with Mg (Fig. Par 53b) 3.) Th- and U-concentrations are slightly enriched in the “neon”-blue growth zone. Th-concentrations are higher than U-concentrations (Fig. Par53b). The highest U-concentrations appear before the Th-maximum in the profile from the core to the rim (See also Fig. Par51b). 4.) The Ca- and Sr-maximum is correlated with the REE-maximum (Fig. Par53c).
Fig. Par54 Ternary Mg-Pb-Zn Diagram
The same trend in the concentration variations of Mg, Pb and Zn was found as described in Fig. Par 34.
LA-ICP-MS Chemical Analysis Profiles of Paraiba Tourmaline, Batalha Mine
Fig. Par54 Ternary Mg-Pb-Zn Diagram
