Table S3.
Elemental and isotopic compositions of the end members used for mixing and AFC models
| Element/isotopes | Depleted mantle | Primitive magma | Sediment | D value (AFC) |
| MgO, wt% | 37.8 | 7.95 | 2.36 | 3 |
| Sr, ppm | 15.5 | 178 | 220 | 3.2 |
| Nd, ppm | 0.713 | 5.5 | 22.6 | 0.22 |
| Pb, ppm | 0.02 | 1.34 | 7.9 | 0.61 |
| δ26Mg | −0.25 | −0.25 | −0.06 | |
| 87Sr/86Sr | 0.70346 | 0.70360 | 0.70887 | |
| 143Nd/144Sr | 0.51301 | 0.51301 | 0.51181 | |
| 206Pb/204Pb | 18.5 | 18.5 | 19.735 |
The MgO content of the depleted mantle is from McDonough and Sun (20). The MgO content of the sediment is from Plank (25), and MgO of the primitive magma is from Kelemen (3). The δ26Mg of the depleted mantle and primitive magma are from Teng et al. (18). The δ26Mg of the sediment is the MgO-weighted average of sediments measured in this study. The assimilation/crystallization ratio of 0.25, Sr, Nd, and Pb content and isotopic compositions of the primitive magma and crustal contaminant, as well as D values for Sr, Nd, and Pb, are from Labanieh et al. (4).