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A sample of mantle-derived basalt with a Hf concentration of 1.5ppm and a 176Hf/177Hf of 0.283100 assimilates some Precambrian crust with 3.5ppmHf and a 176Hf/177Hf

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A sample of mantle-derived basalt with a Hf concentration of 1.5ppm and a 176Hf/177Hf of 0.283100 assimilates some Precambrian crust with 3.5ppmHf and a 176Hf/177Hf of 0.282166. The resulting magma consists of 90% basalt and 10% added crust. Calculate the concentration of Hf,176Hf/177Hf, and epsilon Hf in the mixture. 176Hf/177Hf for CHUR is 0.282785

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