Table 6.

XRF and ICP-MS bulk geochemistry results for the host lithologies (averaged) and two representative pseudotachylytes from Eaval and Obasaraigh

SampleGabbro–diorite–gneissTonalite–gneissPyroxeniteGranite–gneissPseudotachylyte OHFZ-16-012APseudotachylyte OHFZ-16-018A
ClassComponent 1Component 2Component 3Component 4ModelledMeasuredModelledMeasured
Weight %
SiO252.1659.9637.6271.2759.4059.4059.3359.33
Al2O310.1313.441.4815.1412.3116.0512.3414.25
Fe2O310.169.6011.872.267.758.317.887.99
CaO0.370.650.120.320.420.830.430.68
MgO13.874.0937.790.797.943.047.814.61
Na2O1.242.850.004.182.444.032.452.58
K2O1.261.150.033.291.830.851.782.42
Cr2O30.240.020.580.000.120.010.120.04
TiO27.596.411.680.635.326.625.415.13
MnO0.160.120.140.010.110.090.110.10
P2O50.070.100.010.120.090.230.090.18
SrO0.000.040.000.000.010.070.010.03
BaO0.030.020.000.080.040.030.040.05
LOI2.661.619.141.662.140.452.122.55
Total97.2798.4591.3298.0997.7799.5597.8097.40
ppm
Ce22.07146.621.1334.7452.8950.6357.6451.56
Dy1.8210.240.460.243.202.653.573.34
Er1.135.320.270.121.751.381.941.87
Eu0.662.150.140.721.001.331.061.23
Gd2.0313.400.350.644.103.694.594.10
Ho0.371.930.090.040.610.510.680.64
La9.4056.910.5820.2522.9023.3224.5923.07
Lu0.150.640.040.020.220.180.240.26
Nb2.0410.870.002.574.123.864.466.04
Nd11.0275.090.849.8724.6525.4227.2425.64
Pr2.7118.170.163.166.216.216.826.35
Rb38.9323.870.64112.6157.0212.6654.9485.32
Sm2.1616.310.291.004.914.645.504.75
Sr30.34347.1211.93121.38125.78535.75136.68277.13
Ta0.220.570.000.120.270.220.280.55
Tb0.291.880.060.060.570.490.640.58
Th0.8717.380.082.965.081.275.708.46
Tm0.150.720.040.020.240.190.260.26
U0.240.930.020.220.380.180.411.30
V115.21136.7963.1630.4595.33123.8197.89125.27
Y8.8945.172.191.1214.5411.7216.1615.74
Yb1.014.420.270.121.491.221.651.76
Tl0.110.070.000.270.150.040.140.36
Sc21.1345.589.111.8820.8816.0822.2418.44
Comp. 1%49%47%
Comp. 2%22%26%
Comp. 3%0%0%
Comp. 4%29%27%
χ2 value12.9610.53
P-value0.790.91

Associated IDL model results and the relative contributions of each host lithology, plus Chi2 and P-values for the modelled pseudotachylyte are also presented.