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Fig. Par51a Variation in V- and Cr-concentrations
A very distinctly localized Cr-concentration is found only within the “neon”-blue growth phase. V is not correlated with Cr and can only be found in the rim.
Fig. Par51b Variation in Th- and U-concentrations
Th- and U- concentrations are symmetrically detected in the profile and the positions are not identical. They can be correlated with the maximum of the Bi-concentrations. The Th-concentrations were formed first, before the high Bi-concentrations occurred.
Fig. Par51c Variation in Ta- and Nb-concentrations
Ta- and Nb-concentrations show an opposite distribution in the crystal. Highest Ta- and lowest Nb-concentrations are found within the “neon”-blue growth phase of the tourmalines.
Fig. Par51d Variation in Zn-, Fe-, Ti- and Ga-concentrations
A sharp increase in Ti-, Zn- and Fe-concentrations occur at the beginning of the Mn-dominated growth phase. It can correlated with the increase of REE, Ca and Sr. Ti-, Fe- and Zn-concentrations are highest at the contact to the green rim. Towards the end of the crystal growth, their concentrations are constantly decreasing. This trend is opposite to the general increase of Nb, Ca, REE and Sr, which increase towards the outer rim. Slightly elevated Ga-concentrations are found in the green rim of the tourmaline.
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LA-ICP-MS Chemical Analysis Profiles of Paraiba Tourmaline, Batalha Mine
