Electronic Supplementary Materials 4. Representative electron microprobe analyses and structural formula of biotite from the Pengshan granites.

Sample / 801-13-1 / 801-13-2 / 801-13-3 / 801-13-4 / 801-13-5 / 801-13-6 / 801-13-7
SiO2 / 35.77 / 35.48 / 35.05 / 35.91 / 35.53 / 34.42 / 34.33
TiO2 / 2.77 / 1.80 / 1.94 / 1.76 / 1.74 / 2.11 / 2.40
Al2O3 / 21.35 / 22.38 / 21.37 / 21.58 / 21.58 / 21.45 / 22.01
FeO / 26.18 / 25.32 / 24.40 / 23.72 / 22.92 / 24.89 / 25.83
MnO / 1.40 / 1.35 / 0.72 / 0.69 / 0.80 / 0.68 / 1.08
MgO / 1.23 / 1.26 / 1.25 / 1.50 / 1.37 / 1.17 / 1.94
CaO / 0.00 / 0.04 / 0.00 / 0.01 / 0.02 / 0.00 / 0.00
Na2O / 0.23 / 0.17 / 0.28 / 0.35 / 0.27 / 0.28 / 0.21
K2O / 9.13 / 9.06 / 9.30 / 9.09 / 9.10 / 9.04 / 9.32
BaO / 0.10 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00
F / 1.91 / 1.69 / 2.68 / 2.85 / 2.48 / 2.19 / 1.28
Cl / 0.09 / 0.07 / 0.18 / 0.18 / 0.18 / 0.19 / 0.09
SnO / 0.00 / 0.00 / 0.00 / 0.00 / 0.03 / 0.04 / 0.00
Total / 100.16 / 98.61 / 95.99 / 96.39 / 94.92 / 95.50 / 98.48
Cations based on 22 oxgen anions
Si / 5.394 / 5.395 / 5.473 / 5.527 / 5.539 / 5.416 / 5.269
Al iv / 2.606 / 2.605 / 2.527 / 2.473 / 2.461 / 2.584 / 2.731
Tetrahedral site / 8.000 / 8.000 / 8.000 / 8.000 / 8.000 / 8.000 / 8.000
Al vi / 1.189 / 1.406 / 1.406 / 1.442 / 1.505 / 1.395 / 1.250
Ti / 0.314 / 0.206 / 0.227 / 0.204 / 0.204 / 0.250 / 0.277
Cr / 0.000 / 0.000 / 0.000 / 0.000 / 0.000 / 0.000 / 0.000
Fe / 3.302 / 3.220 / 3.186 / 3.053 / 2.988 / 3.275 / 3.315
Mn / 0.179 / 0.174 / 0.095 / 0.090 / 0.105 / 0.091 / 0.140
Mg / 0.276 / 0.286 / 0.290 / 0.344 / 0.318 / 0.275 / 0.444
Ca / 0.000 / 0.007 / 0.000 / 0.001 / 0.003 / 0.000 / 0.000
Octahedral site / 5.260 / 5.297 / 5.206 / 5.134 / 5.123 / 5.286 / 5.427
Na / 0.067 / 0.050 / 0.084 / 0.104 / 0.083 / 0.085 / 0.062
K / 1.756 / 1.757 / 1.852 / 1.784 / 1.810 / 1.815 / 1.824
Ba / 0.006 / 0.000 / 0.000 / 0.000 / 0.000 / 0.000 / 0.000
Interlayer / 1.829 / 1.807 / 1.936 / 1.889 / 1.892 / 1.899 / 1.887
F / 0.911 / 0.813 / 1.325 / 1.389 / 1.224 / 1.090 / 0.621
Cl / 0.023 / 0.018 / 0.046 / 0.046 / 0.046 / 0.051 / 0.023
OH (calc.) / 3.066 / 3.169 / 2.629 / 2.564 / 2.729 / 2.859 / 3.355
Fe/(Fe+Mg) / 0.923 / 0.919 / 0.917 / 0.899 / 0.904 / 0.923 / 0.882
Fe2+ * / 0.332 / 0.321 / 0.309 / 0.299 / 0.289 / 0.316 / 0.330
Fe3+ * / 0.032 / 0.032 / 0.030 / 0.031 / 0.030 / 0.031 / 0.030
Fe3+/Fe(total) / 0.089 / 0.090 / 0.090 / 0.093 / 0.094 / 0.089 / 0.083
T(Ti)** / 633 / 548 / 570 / 546 / 546 / 590 / 611

Electronic Supplementary Materials 4-continued

Sample / 801-13-8 / 801-13-9 / 801-13-10 / 801-13-11 / 1002-13-1 / 1002-13-2 / 1002-16-1 / 1002-16-2
SiO2 / 35.44 / 38.24 / 36.63 / 36.92 / 34.15 / 35.75 / 35.82 / 34.93
TiO2 / 2.54 / 2.25 / 2.43 / 1.97 / 2.87 / 2.39 / 3.26 / 2.63
Al2O3 / 20.91 / 21.47 / 21.44 / 21.97 / 21.45 / 21.18 / 20.54 / 21.09
FeO / 25.74 / 22.17 / 24.06 / 23.41 / 25.98 / 25.35 / 25.78 / 25.43
MnO / 0.88 / 1.12 / 1.16 / 1.24 / 0.94 / 0.71 / 1.01 / 1.01
MgO / 2.02 / 1.21 / 1.15 / 1.21 / 1.71 / 1.83 / 2.00 / 1.88
CaO / 0.02 / 0.00 / 0.01 / 0.00 / 0.01 / 0.03 / 0.03 / 0.02
Na2O / 0.11 / 0.31 / 0.25 / 0.32 / 0.20 / 0.17 / 0.25 / 0.19
K2O / 8.98 / 9.20 / 8.88 / 8.92 / 8.97 / 8.76 / 9.09 / 9.07
BaO / 0.21 / 0.00 / 0.00 / 0.00 / 0.00 / 0.01 / 0.10 / 0.10
F / 0.81 / 2.19 / 1.80 / 1.90 / 1.48 / 1.59 / 2.03 / 1.50
Cl / 0.07 / 0.33 / 0.35 / 0.35 / 0.09 / 0.08 / 0.07 / 0.06
SnO / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00 / 0.00
Total / 97.73 / 98.48 / 98.16 / 98.21 / 97.84 / 97.86 / 99.98 / 97.90
Cations based on 22 oxgen anions
Si / 5.409 / 5.679 / 5.539 / 5.557 / 5.289 / 5.451 / 5.404 / 5.373
Al iv / 2.591 / 2.321 / 2.461 / 2.443 / 2.711 / 2.549 / 2.596 / 2.627
Tetrahedral site / 8.000 / 8.000 / 8.000 / 8.000 / 8.000 / 8.000 / 8.000 / 8.000
Al vi / 1.171 / 1.437 / 1.360 / 1.454 / 1.205 / 1.258 / 1.056 / 1.198
Ti / 0.292 / 0.251 / 0.276 / 0.223 / 0.334 / 0.274 / 0.370 / 0.304
Cr / 0.000 / 0.000 / 0.000 / 0.000 / 0.000 / 0.000 / 0.000 / 0.000
Fe / 3.286 / 2.753 / 3.043 / 2.947 / 3.365 / 3.233 / 3.253 / 3.272
Mn / 0.114 / 0.141 / 0.149 / 0.158 / 0.123 / 0.092 / 0.129 / 0.132
Mg / 0.460 / 0.268 / 0.259 / 0.271 / 0.395 / 0.416 / 0.450 / 0.431
Ca / 0.003 / 0.000 / 0.002 / 0.000 / 0.002 / 0.005 / 0.005 / 0.003
Octahedral site / 5.325 / 4.850 / 5.089 / 5.053 / 5.425 / 5.277 / 5.262 / 5.340
Na / 0.033 / 0.089 / 0.073 / 0.093 / 0.060 / 0.050 / 0.073 / 0.057
K / 1.748 / 1.743 / 1.713 / 1.712 / 1.772 / 1.704 / 1.749 / 1.780
Ba / 0.013 / 0.000 / 0.000 / 0.000 / 0.000 / 0.001 / 0.006 / 0.006
Interlayer / 1.793 / 1.832 / 1.786 / 1.806 / 1.832 / 1.755 / 1.828 / 1.842
F / 0.391 / 1.029 / 0.861 / 0.904 / 0.725 / 0.767 / 0.969 / 0.730
Cl / 0.018 / 0.083 / 0.090 / 0.089 / 0.024 / 0.021 / 0.018 / 0.016
OH (calc.) / 3.591 / 2.888 / 3.049 / 3.006 / 3.251 / 3.213 / 3.014 / 3.255
Fe/(Fe+Mg) / 0.877 / 0.911 / 0.921 / 0.916 / 0.895 / 0.886 / 0.879 / 0.884
Fe2+ * / 0.326 / 0.278 / 0.303 / 0.294 / 0.331 / 0.321 / 0.327 / 0.323
Fe3+ * / 0.032 / 0.031 / 0.032 / 0.032 / 0.031 / 0.032 / 0.032 / 0.031
Fe3+/Fe(total) / 0.089 / 0.101 / 0.096 / 0.097 / 0.086 / 0.092 / 0.089 / 0.088
T(Ti)** / 620 / 591 / 610 / 566 / 644 / 608 / 661 / 628

*Using the calculateing method of Lin & Peng, (1994) to allocate the iron.

**Using the empirical formula provided by Henry et al. (2005) for the temperature of biotite.