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The older cores are interpreted as representing the first alteration/metamorphism of the volcanic pile.Titanite rims record a U–Pb age of 1870 ± 24 Ma (2σ) at Luossavaara, and 1826 ± 15 Ma (2σ) at the smaller Fe oxide–apatite body at Gruvberget.

If the analysed zircon crystal has not suffered either Pb loss or U gain, it will plot on the concordia line from which its age can be deduced.

To check the matrix effect, titanite (BLR-1) and zircon (91500) standards were analyzed as the external standards.

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