3. The element tungsten (W) is important for Hf/W dating of core formation in rocky planets. Tungsten has lithophile and siderophile tendencies and will be distributed between the silicate and metallic portions of the Earth. The W concentration in Earth's mantle is 16 ppb (16 ng/g). Given D = 42 for metal/silicate partitioning, calculate the W concentration in Earth's core and in the bulk Earth. You can assume Ycore = 0.325 and Ymantle = 0.675. The crustal contribution to Earth's tungsten inventory is negligible.

3. The element tungsten (W) is important for Hf/W dating of core formation in rocky planets. Tungsten has lithophile and siderophile tendencies and will be distributed between the silicate and metallic portions of the Earth. The W concentration in Earth's mantle is 16 ppb (16 ng/g). Given D = 42 for metal/silicate partitioning, calculate the W concentration in Earth's core and in the bulk Earth. You can assume Ycore = 0.325 and Ymantle = 0.675. The crustal contribution to Earth's tungsten inventory is negligible.