Table 1.

Representative mineral compositions of the Cpx–Rt shear zone samples

Mineral:PhengiteClinopyroxene Cpx–Rt shear zoneBiotite Cpx–Rt shear zoneNa-amphibole (inclusion in Cpx) Cpx–Rt shear zone
Sample:Host rockCpx–Rt shear zone
Analysis:core 1rim 3core 5rim 71519141061317201419
SiO249.4850.2049.8550.7251.8855.13SiO254.2954.0452.91SiO237.1837.0237.77SiO255.1155.6355.34
TiO20.090.530.030.620.530.22TiO20.770.300.10TiO21.700.800.57TiO20.060.060.15
Al2O327.8323.5127.9922.1919.0018.43Al2O35.075.642.64Al2O312.5011.8610.94Al2O32.272.312.28
FeOtot3.876.333.486.026.284.57FeOtot22.1820.5127.34FeOtot31.5833.0034.37FeOtot22.4721.0322.28
MnO0.240.120.230.17bdl0.04MnO0.010.050.02MnO0.150.120.08MnO0.120.120.15
MgO1.852.491.962.425.186.62MgO1.702.220.43MgO2.723.401.56MgO8.639.408.60
CaObdlbdlbdl0.010.030.00CaO2.543.120.56CaO0.02bdlBdlCaO0.360.280.39
Na2O0.010.060.010.260.250.03Na2O12.5312.2913.28Na2O0.070.051.00Na2O6.977.337.09
K2O11.7111.4211.6510.4110.0011.04K2ObdlbdlbdlK2O9.559.668.47K2O0.280.470.31
BaO0.040.040.010.240.050.04BaObdl0.02bdlBaO0.030.050.18BaObdlbdlbdl
Total95.1294.7095.2193.0693.2096.11Total99.0998.1997.28Total95.5095.9694.94Total96.2796.6396.59
Si3.3633.4713.3723.5413.5893.698Si1.9931.9901.997Si3.0113.0113.114Si7.9887.9777.991
Ti0.0040.0270.0010.0330.0280.011AlT0.0070.0100.003AlT0.9890.9890.886Ti0.0060.0070.017
Al2.2291.9162.2311.8263.0982.914AlO0.2130.2350.115AlO0.2040.1480.176Al0.3880.3900.389
Fe2+0.2200.3660.1970.3520.2370.196Ti0.0210.0080.003Ti0.1040.0490.035Fe3+1.5311.5951.526
Mn0.0140.0070.0130.0100.0000.000Fe3+0.6430.6320.855Fe2+2.1392.2452.370Fe2+1.1930.9271.164
Mg0.1880.2570.1980.2520.5340.662Fe2+0.0380.0000.008Mn0.0110.0080.006Mn0.0150.0150.018
Ca0.0000.0000.0000.0010.0000.000Mn0.0000.0010.001Mg0.3280.4130.191Mg1.8652.0091.851
Ba0.0010.0010.0000.0070.0000.000Mg0.0930.1220.024Ba0.0010.0000.000Ca0.0560.0430.060
Na0.0010.0080.0010.0350.0340.004Ca0.1000.1230.022Ca0.0030.0040.016Na1.9592.0381.985
K1.0151.0071.0050.9270.8820.944Na0.8920.8770.972Na0.0110.0080.160K0.0520.0860.057
K0.9861.0030.891
Jd0.2270.2450.118Gln0.1180.1280.121
Acm0.6650.6320.855XMg0.1330.1550.075Fe–Gln0.0750.0590.076
Di0.0710.1230.017Mg–Rbk0.4800.5560.488
Hd0.0290.0000.006Rbk0.30690.25660.3070
Opx0.0080.0000.005Act0.02060.00000.0076
  • The analyses are normalized to fixed oxygen: phengite, O = 11; biotite, O = 11; amphibole, O = 23; total cations without K = 15; pyroxene, O = 6, total cations = 4. bdl, below detection limit. Mineral abbreviations follow Whitney & Evans (2010).