Table 2.

U–Pb data for the acmite–rutile-bearing shear zone, sample T5A

PropertiesWeight (µg)U (ppm)Pbc (ppm)Pbcom (pg)238/204*2σ%206/204*2σ%235/204*2σ%207/204*2σ%238/206*2σ%207/206*2σ%204/206*2σ%
R515.190.313.5314119829742319816.39.8107100.557730.300.034170.60
R115.680.84114461323.563.03.231316.080.8418.9100.682670.150.042450.50
R155.280.9516364.08.122.661.72.648.115.840.6816.180.699280.300.044140.50
R89.283.9632153.83.521.290.591.123.515.820.397.2100.742770.150.046970.50
R106.311.2114342.49.622.681.92.489.615.690.6615.1100.692040.170.044100.50
R incl in A82502221.763.71.812215.861.111.5100.728660.150.045960.50
A with R incl36011.494.831663156.060.4821.5780.311.1320.4815.790.387.21.00.731760.100.046340.40
A24230.600.22515177.390.5322.130.291.2870.5315.860.338.01.00.716750.110.045200.30
A fibrous4370.410.2398116.361.221.710.370.8441.215.850.375.41.50.730180.200.046070.50
A blocky28230.550.30814120921.460.790.879.215.690.765.6100.731180.300.046601.00
P8768.581.320.980.430.4971.315.770.443.31.50.751470.150.047660.50
C5989050.0780.6120.5180.200.0010.6115.7740.300.001.00.768790.100.048740.10
  • R, rutile; A, acmite; P, phengite; C, oxide or sulphide coatings on quartz; incl, inclusions. Pbc, initial amount of common Pb. Pbcom, total amount of common Pb (initial + blank).

  • * Corrected for fractionation, spike and blank; error calculated by propagating the main sources of uncertainty.