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Supplementary Table 2: Modeling parameter Mantle Wedge beneath Colville Ridge

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Supplementary Table 2: Modeling parameter Mantle Wedge

beneath Colville

Ridge1 Subducting

Sediment1 Three Kings Ridge shoshonitic lava2

Sr (ppm) 12 300 768

87Sr/86Sr 0.70260 0.709 0.70457

Nd (ppm) 1.2 21.6 20.0

143Nd/144Nd 0.51311 0.5125 0.51276

Pb (ppm) 0.2 10.0 11.0

206Pb/204Pb 18.45 18.80 18.84

207Pb/204Pb 15.50 15.64 15.61

208Pb/204Pb 38.17 38.70 38.70

Th (ppm) 0.01 8.0 18.0

Zr (ppm) 15 127 187

1Depleted mantle wedge endmember and subducting sediment compositions are similar to those presented in Todd et al. (2011) and 2Three Kings Ridge data are from Mortimer et al. (1998).

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