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Fig. 6


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A. CL image of a large fluoroapatite IV crystal from SADC(cold cathode type CITL Mk 5, 15 kV, 500 μA, defocalized beam of 4 mm diameter, 20° incidence angle, Mons Polytechnique University, Belgium). The black circle is cylindrical hollow formed by laser ablation performed in Moëlo et al. (2008). The growth banding is due to Sr (green) ↔ Ca (blue) substitution. Labelled laser spots correspond to U-Pb analyses reported in ESM2 (analysis No. 6 failed, whereas No. 22 and 23 are outside the photo framework). Labeled red circles correspond to analyses with radiogenic lead. B. Tera-Wasserburg diagram and intercept age obtained on fluorapatite IV from SADC.

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