Sample BKC-10 Mn. Sample BKC-23 Mn. BKC-10 grt Path A Path B Path C. garnet resorption. garnet resorption. BKC-23 grt Path A Path B Path C

0.5 0.45 0.4 0.35 0.3 Sample BKC-10 Mn BKC-10 grt Path A Path B Path C 0.12 0.1 0.08 Mg 0.25 0.06 0.2 0.15 0.04 0.1 0.05 0.02 0 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 Core Rim 0.9 0.8 Fe 0 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.3.25 0.2 Sample BKC-23 Mn BKC-23 grt Path A Path B Path C garnet resorption 0.3 0.25 0.2 Mg garnet resorption 0.15 0.15 garnet diffusion 0.1 0.1.05 0.05 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Core Rim 0.9 0.85 0.8 0.75 Fe garnet diffusion garnet resorption 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.7 0.65 0.6 0.55 0.5 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Table DR1 - Representative mineral compositions for sample BKC-16 ID number 16grt3(21) grtbt2(12) grtinst1(7) sttr2(12) sttr1(5) S1 16pl1(18) pltr1(20) S10 grtbt2(19) grtbt2(14) S6 grtt1(13) 14S6 S19inpl S14 14S1 Sample BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 BKC-16 Mineral garnet core garnet rim grt inc in st st core st rim st inc in grt pl core pl rim pl inc in grt bt matrix bt near grt chl in grt chl in grt chl matrix mus ilm ep SiO2 36.02 37.10 37.21 28.46 29.09 28.45 60.46 62.27 66.85 37.66 36.84 24.91 26.08 25.96 46.92 0.00 39.27 TiO2 0.00 0.00 0.00 0.72 0.58 0.84 0.00 0.00 0.00 1.19 1.09 0.00 0.00 0.00 0.49 51.34 0.00 Al2O3 20.58 20.40 20.55 53.71 53.20 54.16 23.60 23.02 19.22 17.98 17.78 18.73 23.78 23.99 38.25 0.00 28.64 Cr2O3 0.00 0.00 0.00 0.31 0.42 1.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.41 0.00 0.00 Fe2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.51 9.01 FeO 32.72 32.06 31.97 13.79 14.41 13.81 0.00 0.00 1.19 15.63 16.56 36.47 18.90 22.82 1.02 44.91 0.00 MnO 5.44 7.47 7.42 0.24 0.27 0.36 0.00 0.00 0.00 0.00 0.00 0.53 0.28 0.00 0.00 1.25 0.00 MgO 2.82 1.62 1.85 1.37 1.74 2.09 0.00 0.00 0.00 12.69 11.99 6.74 19.45 15.85 0.49 0.00 0.00 ZnO 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 CaO 1.46 1.43 1.40 0.00 0.00 0.00 6.13 4.73 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 23.07 Na2O 0.00 0.00 0.00 0.00 0.00 0.00 8.19 8.66 10.61 0.00 0.00 0.00 0.00 0.00 1.47 0.00 0.00 K2O 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9.25 9.31 0.00 0.00 0.00 9.07 0.00 0.00 Total 99.05 100.07 100.40 98.60 99.71 100.85 98.38 98.67 98.12 94.40 93.57 87.39 88.50 88.63 98.13 100.00 99.09 No. Oxygens 12 12 12 46 46 46 8 8 8 11 11 14 14 14 11 11 21 Si 2.957 3.021 3.017 7.836 7.943 7.689 2.730 2.788 2.984 2.822 2.806 2.814 2.622 2.652 3.010 0.000 5.03 Ti 0.000 0.000 0.000 0.148 0.120 0.171 0.000 0.000 0.000 0.067 0.062 0.000 0.000 0.000 0.024 0.976 0.00 Al 1.991 1.958 1.963 17.424 17.118 17.249 1.256 1.215 1.011 1.588 1.596 2.494 2.817 2.888 2.892 0.000 4.32 Cr 0.000 0.000 0.000 0.068 0.091 0.240 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.021 0.000 0.00 Fe3+ 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.048 0.87 Fe2+ 2.246 2.183 2.167 3.174 3.291 3.121 0.000 0.000 0.044 0.979 1.054 3.445 1.589 1.949 0.055 0.949 0.00 Mn2+ 0.378 0.516 0.509 0.057 0.063 0.083 0.000 0.000 0.000 0.000 0.000 0.051 0.024 0.000 0.000 0.027 0.00 Mg 0.345 0.197 0.224 0.564 0.706 0.841 0.000 0.000 0.000 1.418 1.362 1.135 2.916 2.414 0.047 0.000 0.00 Zn 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.00 Ca 0.128 0.124 0.122 0.000 0.000 0.000 0.297 0.227 0.012 0.000 0.000 0.000 0.000 0.000 0.000 0.000 3.16 Na 0.000 0.000 0.000 0.000 0.000 0.000 0.717 0.751 0.918 0.000 0.000 0.000 0.000 0.000 0.183 0.000 0.00 K 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.885 0.905 0.000 0.000 0.000 0.742 0.000 0.00 Total cations (s) 8.047 8.000 8.002 29.270 29.332 29.395 5.000 4.981 4.969 7.759 7.786 9.939 9.969 9.904 6.973 2.00 13.38 Xmg (mg/(fe+mg)) 0.13 0.08 0.09 0.15 0.18 0.21 0.59 0.56 0.25 0.65 0.55 Xan (ca/(ca+na+k)) 0.29 0.23 0.01 Xps 0.17 Xgrs 0.04 0.04 0.04 Xalm 0.73 0.72 0.72 Xpyr 0.11 0.07 0.07 Xsps 0.12 0.17 0.17 XK 0.80 y(bi) 0.41 0.40

Table DR1 contd. - Representative mineral compositions for sample BKC-23 ID number grt7_(10) grt7_(11) grts1_(33) grts1_(34) grt4_(2) st1_(10) st1_(14) pl1t_(8) chl1t_(1) plingrt1_(6) chl1t_(2) S5 chl1t_(5) S3 mu1_(10) mxeptr1(4) Sample BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 BKC23 Mineral garnet core garnet core garnet rim garnet rim garnet rim st core st rim pl core pl rim pl inc grt pl nxt chl bt chl matrix chl in grt mu ep SiO2 38.25 37.95 36.68 37.15 37.62 28.21 28.93 59.10 60.09 58.64 64.45 34.96 24.90 24.75 46.96 39.61 TiO2 0.00 0.00 0.92 0.00 0.00 0.52 0.56 0.00 0.00 0.00 0.00 1.28 0.00 0.00 0.51 0.00 Al2O3 21.51 21.67 20.53 20.91 21.52 55.32 55.42 26.34 25.34 26.50 21.68 17.77 23.57 22.86 35.34 30.07 Cr2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Fe2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6.29 FeO 29.73 29.46 31.14 32.12 34.04 8.87 6.46 0.00 0.30 0.00 0.42 20.95 25.34 29.87 0.94 0.00 MnO 6.20 6.56 1.04 1.06 2.42 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MgO 2.32 2.08 2.81 2.81 2.60 1.68 0.95 0.00 0.00 0.00 0.00 10.90 15.46 12.79 0.93 0.00 ZnO 0.00 0.00 0.00 0.00 0.00 4.70 6.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 CaO 3.64 3.58 6.09 5.67 2.86 0.00 0.00 7.41 6.64 7.87 2.19 0.00 0.00 0.00 0.00 24.37 Na2O 0.00 0.00 0.00 0.00 0.00 0.00 0.00 7.35 7.78 7.17 10.11 0.00 0.00 0.00 0.59 0.00 K2O 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 7.91 0.00 0.00 10.48 0.00 Total 101.65 101.31 99.22 99.72 101.07 99.29 98.83 100.20 100.15 100.17 98.85 93.78 89.27 90.27 95.75 100.34 No. Oxygens 12 12 12 12 12 46 46 8 8 8 8 11 14 14 11 21 Si 3.020 3.009 2.961 2.986 2.995 7.707 7.908 2.629 2.672 2.614 2.869 2.707 2.569 2.587 3.101 5.024 Ti 0.000 0.000 0.056 0.000 0.000 0.106 0.115 0.000 0.000 0.000 0.000 0.075 0.000 0.000 0.025 0.000 Al 2.001 2.025 1.953 1.981 2.019 17.810 17.853 1.381 1.328 1.392 1.137 1.621 2.866 2.816 2.750 4.494 Cr 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe3+ 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.600 Fe2+ 1.962 1.953 2.102 2.159 2.266 2.027 1.476 0.000 0.011 0.000 0.016 1.356 2.186 2.610 0.052 0.000 Mn2+ 0.415 0.440 0.071 0.072 0.163 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Mg 0.274 0.246 0.338 0.337 0.309 0.684 0.386 0.000 0.000 0.000 0.000 1.258 2.377 1.993 0.092 0.000 Zn 0.000 0.000 0.000 0.000 0.000 0.948 1.313 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Ca 0.308 0.304 0.527 0.488 0.244 0.000 0.000 0.353 0.316 0.376 0.104 0.000 0.000 0.000 0.000 3.311 Na 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.634 0.671 0.619 0.873 0.000 0.000 0.000 0.076 0.000 K 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.781 0.000 0.000 0.882 0.000 Total cations (s) 7.980 7.978 8.007 8.023 7.996 29.282 29.051 4.997 4.998 5.001 4.999 7.798 9.998 10.01 6.98 13.43 Xmg (mg/(fe+mg)) 0.12 0.11 0.14 0.13 0.12 0.25 0.21 0.48 0.52 0.43 Xan (ca/(ca+na+k)) 0.36 0.32 0.38 0.11 Xps 0.12 Xgrs 0.10 0.10 0.17 0.16 0.08 Xalm 0.66 0.66 0.69 0.71 0.76 Xpyr 0.09 0.08 0.11 0.11 0.10 Xsps 0.14 0.15 0.02 0.02 0.05 XK 0.92 y(bi) 0.33

Table DR1 contd. - Representative mineral compositions for sample BKC-10 ID number grttr1g4(1) grttr1g4(6) grttr1g4(22) grttr1g4(29) S15 chlpltr1(12) chlpltr1(9) S14 S2 S3 S4 S4 S5 S2 S18 Sample BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 BKC10 Mineral garnet core garnet core garnet rim garnet rim bt pl core pl rim pl with mus chl fine chl coarse chl in grt ilm in grt ilm grt rim ilm matrix ep SiO2 38.56 36.37 36.90 37.38 36.38 58.78 62.17 61.69 24.82 25.95 25.03 0.00 0.15 0.19 38.15 TiO2 0.00 0.00 0.00 0.00 0.98 0.00 0.00 0.00 0.18 0.26 0.00 48.88 50.99 51.78 0.00 Al2O3 19.76 20.27 20.38 20.55 15.32 26.14 23.80 22.70 22.87 22.04 20.78 0.00 0.00 0.00 26.56 Cr2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Fe2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9.64 FeO 28.29 29.49 30.47 30.81 19.82 0.22 0.47 0.45 28.98 28.39 31.09 7.45 2.90 1.27 0.00 MnO 10.01 9.49 8.61 5.72 0.30 0.00 0.00 0.00 0.18 0.31 0.40 41.80 41.78 43.62 0.15 MgO 1.47 1.55 1.49 1.43 11.88 0.00 0.00 0.00 12.58 11.99 11.59 1.44 4.06 3.14 0.00 ZnO 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.34 0.00 0.00 0.00 CaO 2.16 2.22 2.80 4.62 0.00 8.14 5.37 4.70 0.00 0.00 0.00 0.00 0.00 0.00 22.61 Na2O 0.00 0.00 0.00 0.00 0.00 7.05 8.63 8.72 0.00 0.00 0.00 0.08 0.12 0.00 0.00 K2O 0.00 0.00 0.00 0.00 8.73 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Total 100.26 99.39 100.65 100.50 93.42 100.33 100.44 98.25 89.62 88.93 88.89 100.90 101.20 100.27 97.12 No. Oxygens 12 12 12 12 11 8 8 8 14 14 14 3 3 3 21 Si 3.112 2.990 2.996 3.015 2.830 2.620 2.749 2.782 2.603 2.729 2.687 0.000 0.004 0.005 5.055 Ti 0.000 0.000 0.000 0.000 0.057 0.000 0.000 0.000 0.014 0.020 0.000 0.929 0.969 0.983 0.00 Al 1.879 1.964 1.949 1.954 1.404 1.373 1.240 1.207 2.827 2.732 2.629 0.000 0.000 0.000 4.148 Cr 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.00 Fe3+ 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.142 0.055 0.024 0.962 Fe2+ 1.909 2.027 2.068 2.078 1.289 0.008 0.017 0.017 2.541 2.496 2.791 0.883 0.882 0.921 0.00 Mn2+ 0.684 0.661 0.592 0.390 0.020 0.000 0.000 0.000 0.016 0.027 0.036 0.031 0.087 0.067 0.017 Mg 0.177 0.190 0.180 0.172 1.378 0.000 0.000 0.000 1.967 1.880 1.855 0.013 0.000 0.000 0.00 Zn 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.00 Ca 0.187 0.196 0.243 0.399 0.000 0.389 0.254 0.227 0.000 0.000 0.000 0.002 0.003 0.000 3.210 Na 0.000 0.000 0.000 0.000 0.000 0.609 0.740 0.763 0.000 0.000 0.000 0.000 0.000 0.000 0.00 K 0.000 0.000 0.000 0.000 0.866 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.00 Total cations (s) 7.948 8.028 8.029 8.008 7.844 4.998 5.001 4.996 9.969 9.885 9.999 2.000 2.000 2.00 13.39 Xmg (mg/(fe+mg)) 0.08 0.09 0.08 0.08 0.52 0.44 0.43 0.40 0.48 0.43 Xan (ca/(ca+na+k)) 0.39 0.26 0.23 Xps 0.19 Xgrs 0.06 0.06 0.08 0.13 Xalm 0.65 0.66 0.67 0.68 Xpyr 0.06 0.06 0.06 0.06 Xsps 0.23 0.22 0.19 0.13 XK 0.92 y(bi) 0.33

Table DR2 - U-Pb LA-SF-ICPMS monazite data Spot 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ ρ Concordance 207 Pb/ 206 Pb 1σ 206 Pb/ 238 U 1σ 207 Pb/ 235 U 1σ Sample BKC-8 1a 0.28692 0.00581 27.56646 3.37337 0.70299 0.01314 0.153 99.18 3401 31 3432 50 3404 ## 1b 0.29025 0.00414 27.67197 1.9663 0.68203 0.00955 0.197 101.65 3419 22 3352 37 3408 70 1c 0.29101 0.00492 30.07756 2.93796 0.76696 0.01223 0.163 95.08 3423 26 3670 45 3489 96 1d 0.29075 0.0052 29.87649 3.1812 0.73995 0.01245 0.158 97.55 3422 28 3570 46 3483 ## 1e 0.29874 0.00547 28.71558 3.12247 0.71635 0.01239 0.159 98.89 3464 28 3482 47 3444 ## 1f 0.28692 0.00458 27.72276 2.41672 0.6853 0.01043 0.175 101.33 3401 25 3365 40 3409 85 2a 0.31619 0.00387 35.72249 1.90232 0.82976 0.01051 0.238 93.94 3551 19 3895 37 3659 53 2c 0.30039 0.00965 31.25661 6.83592 0.77855 0.02246 0.132 95.02 3472 49 3712 81 3527 ## 4 0.28723 0.00472 57.73135 7.03491 1.33826 0.02155 0.132 75.53 3403 25 5476 59 4136 ## 3a 0.29953 0.00549 38.44069 4.68081 0.89506 0.016 0.147 90.55 3468 28 4121 54 3731 ## 3b 0.29833 0.0067 29.25511 4.13934 0.69298 0.01436 0.146 102.01 3462 34 3394 55 3462 ## 3c 0.30099 0.00584 28.11647 3.12354 0.66274 0.01195 0.162 104.44 3475 30 3278 46 3423 ## 3d 0.29525 0.00746 28.03139 4.40109 0.69788 0.01596 0.146 100.22 3446 39 3413 61 3420 ## 3e 0.28945 0.00642 33.48669 4.83945 0.80826 0.01644 0.141 94.14 3415 34 3819 59 3595 ## 3f 0.29235 0.00711 28.30385 4.29216 0.71112 0.01566 0.145 99.05 3430 37 3463 59 3430 ## 3g 0.30376 0.00699 27.89104 3.83946 0.66738 0.0141 0.153 103.63 3490 35 3296 55 3415 ## 2d 0.30387 0.00764 43.21191 8.1252 1.02845 0.02416 0.125 84.38 3490 38 4559 77 3847 ## Sample BKC-16 1a 0.24772 0.00288 20.97794 0.83703 0.60458 0.00693 0.287 102.93 3170 18 3048 28 3138 39 1b 0.24998 0.00309 21.21042 0.99985 0.60404 0.00716 0.251 103.36 3185 19 3046 29 3148 46 1c 0.26297 0.00374 22.19862 1.48145 0.6253 0.00832 0.199 101.96 3265 22 3131 33 3193 65 2a 0.24871 0.00276 20.62041 0.68554 0.59454 0.00659 0.333 103.76 3177 17 3008 27 3121 32 2b 0.2498 0.00271 21.03035 0.62549 0.61072 0.00668 0.368 102.18 3184 17 3073 27 3140 29 3 0.25014 0.00279 21.31009 0.71858 0.61509 0.00684 0.330 102.02 3186 18 3090 27 3153 33 4a 0.25253 0.00297 21.20995 0.86004 0.60979 0.00709 0.287 102.57 3201 19 3069 28 3148 39 4b 0.24973 0.00279 21.50695 0.69875 0.618 0.00693 0.345 101.92 3183 18 3102 28 3162 32 5 0.25101 0.00296 21.55927 0.87713 0.61463 0.00715 0.286 102.45 3191 19 3089 29 3164 39 8 0.25005 0.0029 21.39714 0.81727 0.61594 0.00708 0.301 102.04 3185 18 3094 28 3157 37 9a 0.25197 0.00282 23.12039 0.78531 0.65948 0.00742 0.331 98.99 3197 18 3265 29 3232 33 10a 0.25384 0.00319 21.76435 1.02259 0.61433 0.00749 0.259 102.79 3209 20 3087 30 3173 46 11 0.25091 0.00296 21.4263 0.83277 0.62279 0.00729 0.301 101.19 3191 19 3121 29 3158 38 9b 0.25065 0.00288 20.72845 0.69462 0.59964 0.0069 0.343 103.22 3189 18 3028 28 3126 32 4c 0.24973 0.00304 21.23318 0.87593 0.61912 0.00736 0.288 101.38 3183 19 3106 29 3149 40 2c 0.25118 0.00291 21.50894 0.74094 0.60981 0.00706 0.336 103.02 3192 18 3069 28 3162 33

Table DR3 - Laser ablation trace element data for monazite and garnet Monazite BKC-8 Element (ppm) MON_1_g1 MON_2_g1 MON_3_g1 MON_4_g1 MON_5_g1 MON_6_g1 MON_7_g2 MON_8_g3 MON_9_g3 MON_10_g3 MON_11_g3 MON_12_g3 Li7 bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl P31 138413.02 132622.7 124819.55 109084.09 111319.99 106484.53 85932.99 91588.27 87810.1 82918.61 79615.93 77454.64 Sc45 bdl bdl bdl bdl bdl bdl 2.55 bdl bdl bdl 3.66 bdl Ti47 15.23 bdl bdl 439.44 144.3 75.96 bdl 4071.61 553.69 30.41 132.42 6664.72 V51 bdl bdl 0.36 bdl bdl bdl bdl bdl bdl bdl 0.82 bdl Rb85 0.7 0.67 1.43 0.45 4.05 0.89 6.06 1.68 1.53 0.89 0.81 0.23 Sr88 33.47 39.08 33.23 55.97 41.59 27.28 98.54 35.9 48.86 45.53 48.88 30.53 Y89 2982.75 3793.44 4717.24 4140.22 4087.72 5201.41 2395.07 3654.74 3122.92 3129.19 3149.34 3331.67 Zr90 0.94 42.27 19.05 348.31 647.29 581.56 17.12 130.85 48.36 1.84 12.93 291.84 Nb93 0.158 0.151 0.24 31.61 7.36 4.49 0.024 105.62 13.5 0.58 2.71 155.71 Cs133 0.031 0.067 0.157 0.049 0.058 0.05 0.085 bdl 0.019 0.02 bdl 0.074 Ba137 2.2 2.28 3.85 1.61 12.27 3.08 3.05 5.34 8.3 4.5 7.11 4.73 La139 85162.68 86732.31 88929.74 107124.24 103972.25 104672.3 152970.31 112002.02 115725.37 123858.08 120936.97 138147.84 Ce140 230468.56 230468.56 230468.56 230468.56 230468.56 230468.56 230468.56 230468.55 230468.56 230468.55 230468.56 230468.56 Pr141 27811.57 27883.81 27560.01 22792.97 23735.33 23698.24 17922.67 25774.28 25443.21 24402.36 24619.93 23336.81 Nd146 111194.96 113664.55 115155.13 77324.5 82630.86 85492.07 47331.58 103656.21 98036.73 92607.52 94351.5 88333.35 Sm147 18516.6 19243.99 20919.52 12741.42 14418.18 15803.25 4951.21 19160.26 17918.14 15305.09 16318.87 13668.08 Eu151 1625.22 1734.95 1996.93 1270.92 1385.19 1552.97 475.24 1378.9 1341.75 1359.53 1374.93 812.72 Gd157 10668.32 11845.15 13274.54 9522.31 10335.76 11900.04 2522.27 12469.36 11592.71 9785.32 10430.49 8391.16 Tb159 808.91 938.32 1091.91 889.25 928.02 1086.66 241.96 1022.49 948.53 818.96 848.05 640.58 Dy163 2014.1 2399.69 2894.52 2436.99 2486.61 3016.74 963.3 2526.75 2300.67 2125.68 2111.56 1845.57 Ho165 160.12 204.13 248.23 210.96 213.81 270.74 123.76 196.72 174.6 174.03 169.78 170.15 Er166 167.3 218.2 282.64 232.24 230.62 308.82 169.34 204.01 174.77 177.99 177.49 188.88 Tm169 8.87 12.35 16.22 13.58 12.66 18.17 10.18 11.19 9.24 9.06 9.71 10.82 Yb174 24.2 35.77 48.04 42.69 40.1 60.56 28.83 30.73 24.3 25.2 25.16 31.22 Lu175 1.77 2.65 3.77 3.08 3.07 4.74 1.97 2.15 1.63 1.53 1.6 2.08 Hf178 0.122 1.2 0.73 12.02 20.43 20.98 0.67 7.06 2.87 0.47 1.19 18.86 Ta181 0.04 0.044 0.011 2.02 0.94 0.502 0.045 9.93 1.73 <0.031 0.291 20.84 Pb208 2600.46 1844.11 1441.68 1533.53 954.56 715.02 4861.35 2031.45 3265.48 2720.1 2442.91 773.85 Th232 7585.89 5805.41 4753.02 4968.02 3073.29 2287.61 14718.69 6037.1 9817.5 8323.46 7643.09 2442.63 U238 37.48 73.45 81.75 577.07 320.95 202.71 56.98 47.22 35.72 33.72 39.2 66.8 Eu/Eu* 0.35 0.35 0.37 0.35 0.35 0.35 0.41 0.27 0.28 0.34 0.32 0.23 (Gd/Lu) N 745.08 552.56 435.27 382.18 416.18 310.35 158.27 716.95 879.18 790.62 805.87 498.70

Table DR3 contd. - Laser ablation trace element data for monazite and garnet Monazite BKC-16 Element (ppm) MON_1_g1 MON_2_g2 MON_3_g2 MON_4_g2 MON_5_g3 MON_6_g4 MON_7_g8 MON_9_g7 MON_11_g2 MON_12_g1 Li7 bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl P31 90189.28 97515.24 99324.09 104300.63 101492.32 104387.05 107160.24 111121.46 111986.06 111421.81 Sc45 7.04 bdl bdl bdl bdl bdl bdl bdl bdl bdl Ti47 66.65 bdl 66.13 bdl 121.78 121.37 bdl 44.35 955.65 bdl V51 13.96 4.96 4.36 8.01 29.15 64.48 9.3 11.33 17.34 5.09 Rb85 0.87 bdl bdl 0.58 3.12 0.84 1.55 1.19 1.11 bdl Sr88 15.2 17.32 16.2 19.96 16.57 67.13 19.55 19.1 14.73 15.17 Y89 15339.94 17323.6 17393.02 19350.08 18350.53 15986.88 16258.08 18617.47 15807.03 15565.94 Zr90 127.97 36.57 248.24 0.22 bdl 96.78 1.09 0.44 92.33 0.28 Nb93 0.24 0.07 bdl bdl 0.41 0.22 0.067 0.34 bdl bdl Cs133 bdl bdl bdl bdl bdl bdl bdl bdl 0.09 bdl Ba137 bdl bdl bdl 0.69 16.66 5.38 0.7 bdl bdl bdl La139 96519.43 94692.54 94096.02 94272.6 93491.59 92311.9 94649.67 92771.51 94735.17 92588.86 Ce140 230468.59 230468.59 230468.58 230468.56 230468.56 230468.56 230468.56 230468.56 230468.56 230468.56 Pr141 32243.96 33000.55 32929.3 33517.32 32605.61 33369.32 32983.9 32734.56 32468.31 33312.39 Nd146 163561.23 166337.92 167492.89 169435.41 165440.08 162764.23 161620.98 158998.34 156759.25 158653.58 Sm147 36279.79 38626.04 39081.9 41028.84 38199.3 36416.09 36986.82 35781.13 36026.44 36428.51 Eu151 6719.12 7643.89 7730.91 8054.12 7103.83 7095.35 6850.33 7262.82 6604.47 8157.52 Gd157 25658.8 30832.32 31552.19 34222.73 28477.85 27764.09 26901.41 26168.59 26159.09 24691.19 Tb159 2448.21 3075.25 3155.27 3342.45 2797.52 2840.21 2578.39 2601.6 2541.44 2340.03 Dy163 7970.9 9979.37 10006.43 10629.31 9452.81 9331.8 8698.98 9139.52 8744.74 7894.3 Ho165 826.33 923.6 950.51 1033.31 973.86 917.82 890.52 977.55 847.84 822.02 Er166 1081.89 1073.41 1097.46 1222.97 1214.26 1018.65 1164.52 1362 1029.15 1114.74 Tm169 71.03 67.27 66.56 77.16 81.05 59.23 76.54 100.31 65.94 78.88 Yb174 245.98 189.62 199.3 243.71 294.04 175.36 262.42 372.49 202.79 292.74 Lu175 18.87 15.12 15.56 17.57 19.99 12.31 21.47 27.47 16.65 24.46 Hf178 8.77 1.13 8.08 0.6 1.13 2.66 0.81 0.61 2.45 0.27 Ta181 bdl 0.034 0.244 0.099 bdl 0.22 bdl 0.102 0.06 bdl Pb208 1309.68 2083.07 1911.62 2430.25 1969.54 2686.89 1604.45 2032.31 1455.7 1690.63 Th232 4242.61 6630.95 6276.38 7703.41 6229.96 8200.28 5165.6 6436.01 4831.76 5537.19 U238 387.51 815.75 803.96 1113.86 601.27 714.62 461.41 658.58 427.26 397.67 Eu/Eu* 0.67 0.68 0.67 0.66 0.66 0.68 0.66 0.72 0.66 0.83 (Gd/Lu) N 168.09 252.08 250.67 240.78 176.11 278.81 154.89 117.76 194.22 124.79

Table DR3 contd. - Laser ablation trace element data for monazite and garnet Garnet BKC-23 Element (ppm) rim core core core core rim 1GRT_5 1GRT_6 1GRT_7 1GRT_8 1GRT_9 1GRT_10 1GRT_15 2GRT_2 2GRT_4 2GRT_7 2GRT_9 2GRT_12 2GRT_17 2GRT_18 2GRT_22 2GRT_23 Li7 bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl P31 bdl 36.62 133.82 32.69 bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl Sc45 26.72 18.26 6.08 7.09 13.76 74.57 56.07 9.31 18.07 56.50 48.38 81.30 14.18 11.38 14.21 29.13 Ti47 415.00 425.72 321.47 356.83 321.00 428.87 312.88 357.38 278.85 402.52 140.69 138.41 320.52 522.51 290.83 289.23 V51 42.75 44.53 24.31 47.23 31.18 90.15 59.61 30.90 32.42 40.12 97.63 140.95 32.94 56.95 19.35 20.42 Rb85 bdl 0.03 bdl 0.01 bdl bdl 0.15 0.12 bdl bdl bdl bdl bdl bdl bdl 0.04 Sr88 0.09 bdl 0.10 bdl bdl 0.01 0.11 0.65 bdl 0.04 bdl 0.04 0.11 bdl bdl bdl Y89 91.33 64.95 24.34 27.72 24.86 127.22 85.71 17.09 13.67 68.15 209.60 614.95 28.43 26.94 265.95 316.63 Zr90 4.73 5.07 49.48 6.27 3.59 281.26 14.54 4.67 4.25 1946.90 127.42 2.51 2.90 5.25 5.49 5.56 Nb93 0.05 0.15 0.11 0.09 0.18 0.77 0.97 0.13 0.79 1.33 0.19 0.12 0.16 0.35 0.66 0.02 Cs133 bdl 0.01 bdl bdl bdl 0.01 0.02 0.04 bdl bdl bdl 0.02 bdl bdl 0.08 bdl Ba137 bdl 0.03 bdl bdl 0.13 0.03 0.18 0.59 bdl 0.09 0.06 0.05 bdl bdl bdl bdl La139 bdl bdl bdl bdl bdl bdl bdl 0.01 bdl 0.01 bdl bdl bdl bdl 0.01 bdl Ce140 bdl bdl bdl 0.03 bdl bdl bdl bdl 0.01 0.01 bdl 1.62 0.01 bdl 0.01 0.02 Pr141 bdl bdl bdl 0.00 bdl 0.01 bdl bdl 0.01 0.04 0.00 bdl bdl 0.01 0.00 bdl Nd146 0.06 0.08 0.08 0.17 bdl 0.03 0.02 0.14 bdl 0.10 bdl 0.06 bdl 0.11 bdl 0.04 Sm147 0.28 0.32 0.39 0.31 0.21 0.25 0.05 0.31 0.33 0.27 0.04 0.17 0.23 0.30 0.31 0.25 Eu151 0.38 0.32 0.47 0.43 0.38 0.26 0.23 0.36 0.27 0.59 0.25 0.28 0.32 0.47 0.40 0.36 Gd157 2.83 1.83 1.73 2.46 1.82 1.62 0.94 2.08 1.11 1.03 0.60 1.21 0.88 1.75 5.66 5.75 Tb159 0.97 0.73 0.55 0.51 0.39 0.82 0.38 0.49 0.31 0.37 0.45 0.88 0.30 0.37 2.22 2.77 Dy163 8.98 6.51 3.00 3.15 2.91 9.83 4.40 2.17 1.94 4.30 8.60 24.36 2.49 2.77 26.77 33.40 Ho165 2.71 1.79 0.85 0.63 0.59 3.30 1.81 0.34 0.39 1.65 4.51 14.40 0.72 0.57 8.91 9.96 Er166 10.56 5.36 1.52 1.68 1.55 14.52 8.66 0.91 0.96 9.23 26.36 97.73 2.43 1.68 31.85 34.52 Tm169 1.88 1.02 0.37 0.22 0.22 2.97 1.98 0.17 0.12 2.14 7.04 27.04 0.47 0.30 6.38 5.84 Yb174 14.56 7.83 2.56 1.81 2.16 25.81 18.04 1.11 1.05 21.96 65.07 248.90 4.20 1.79 53.30 40.84 Lu175 2.31 1.15 0.53 0.28 0.32 4.56 2.90 0.22 0.15 3.96 7.85 35.21 0.68 0.29 9.72 6.51 Hf178 0.13 0.08 1.48 0.50 0.04 7.79 0.47 0.04 0.08 50.78 3.46 0.03 0.06 0.04 0.04 0.07 Ta181 0.05 0.06 0.03 0.02 0.04 0.17 0.11 0.04 0.08 0.24 0.03 0.03 0.12 0.12 0.04 0.02 Pb208 bdl 0.06 bdl 0.10 bdl bdl 0.33 0.07 0.09 0.18 bdl bdl 0.07 bdl bdl bdl Th232 0.12 0.00 0.01 0.04 bdl 0.04 0.05 0.03 0.06 0.07 0.05 bdl bdl bdl 0.01 0.24 U238 0.01 bdl 0.26 0.03 bdl 0.88 0.13 bdl 0.01 7.22 1.31 bdl 0.03 0.04 0.00 0.00 Eu/Eu* 1.30 1.27 1.74 1.51 1.85 1.23 3.39 1.39 1.39 3.37 5.13 1.92 2.19 1.98 0.93 0.92 (Gd/Lu) N 0.15 0.20 0.40 1.08 0.70 0.04 0.04 1.19 0.89 0.03 0.01 0.00 0.16 0.74 0.07 0.11

Table DR4: Lu, Hf, Sm, Nd concentrations and 176 Lu/ 177 Hf, 176 Hf/ 177 Hf, 147 Sm/ 144 Nd and 143 Nd/ 144 Nd isotope compositions of whole rocks and garnets from the Barberton mountain land. Sample Type Lu (ppm) Hf (ppm) 176 Lu/ 177 Hf * 176 Hf/ 177 Hf εhf(0) εhf(t) Sm (ppm) Nd (ppm) 147 Sm/ 144 Nd 143 Nd/ 144 Nd εnd(0) εnd(t) BKC-23 Whole rock (bomb) 0.5245 5.734 0.01298 0.281288 ±5-52.2-0.3 6.113 31.41 0.1192 0.510775 ±8-36.3-1.3 BKC-23 Whole rock (table top) 0.4497 5.458 0.01169 0.281296 ±8-52.5-3.7 6.295 31.91 0.1176 0.510774 ±8-36.4-0.6 BKC-23 Gt-2; core corse 3.846 3.722 0.1469 0.289748 ±4 +247-27.8 2.089 10.38 0.1215 0.510848 ±10-34.9-1.0 BKC-23 Gt-2; core fine 4.400 3.559 0.1758 0.291458 ±5 +308-36.2 1.035 4.890 0.1279 0.510981 ±9-32.3-1.2 BKC-23 Gt-2; rim coarse 6.260 11.10 0.08007 0.285531 ±3 +97.6-15.7 2.660 10.45 0.1539 0.511465 ±7-22.9-3.6 BKC-23 Gt-2; rim fine 2.181 3.757 0.08243 0.285712 ±3 +104-15.0 2.862 13.92 0.1242 0.510930 ±10-33.3-0.6 BKC-23 Gt-1; core 2.915 4.380 0.09454 0.286500 ±4 +132-16.4 0.6678 2.640 0.1529 0.511456 ±6-23.1-3.3 BKC-23 Gt-1; rim 2.912 3.907 0.1059 0.287089 ±4 +153-22.9 0.5162 1.401 0.2227 0.512877 ±10 +4.7-7.1 * external error on 176 Lu/ 177 Hf is 0.5% for whole rocks and 1% for garnet separates and includes average error magnification for over- or under-spiked samples external error on 147 Sm/ 144 Nd is 0.5% for whole rocks and 1% for garnet separates and includes average error magnification for over- or under-spiked samples Reported uncertainties are 2σ internal on 176 Hf/ 177 Hf. The external reproducibility is estimated to be 0.5 epsilon units for the whole rocks and 1 epsilon unit for the garnet separates. Where internal errors were larger than external estimates the internal errors were taken for the calculation of the isochron. Reported uncertainties are 2σ internal on 143 Nd/ 144 Nd. The external reproducibility is estimated to be 0.5 epsilon units for whole rocks and samples. Where internal errors were larger than external estimates the internal errors were taken for the calculation of the isochron.

Table DR5. Whole rock compositions for studied samples. Sample BKC-10 BKC-16 BCK-23 Major elements (wt%) SiO 2 64.29 58.61 62.54 TiO 2 1.72 3.02 0.84 Al 2 O 3 12.72 20.58 16.80 Cr 2 O 3 0.07 0.12 0.01 FeO 11.06 9.10 6.99 Fe 2 O 3 0.00 0.21 0.16 MnO 0.59 0.38 0.14 MgO 3.35 2.64 3.05 CaO 1.30 0.81 3.45 Na 2 O 1.60 1.15 2.86 K 2 O 0.34 1.43 0.31 P 2 O 5 0.00 0.02 0.18 LOI 2.56 1.22 2.34 Total 99.60 99.29 99.66