Table 5.

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

SampleGabbro–diorite–gneissGranodiorite–gneissGranite–gneissPseudotachylyte OHFZ-16-001APseudotachylyte OHFZ-16-002A
ClassComponent 1Component 2Component 4ModelledMeasuredModelledMeasured
Weight %
SiO249.6169.4669.2063.2763.2757.7257.72
Al2O313.2815.4014.9314.1915.6613.5814.94
Fe2O315.813.092.807.305.8710.879.93
TiO21.300.320.210.550.650.820.91
MgO5.631.111.162.992.584.273.74
Na2O2.624.053.143.313.682.903.33
K2O1.162.465.201.652.781.282.24
Cr2O30.010.000.000.010.020.010.01
CaO9.603.102.325.244.137.076.26
MnO0.170.030.030.090.070.130.12
P2O50.160.110.090.110.220.120.22
SrO0.030.060.070.050.060.040.05
BaO0.020.060.180.040.070.030.04
LOI0.540.620.661.190.641.190.44
Total99.3999.2599.3298.7999.0598.8199.50
ppm
Ce28.7043.6914.44102.88107.31100.89104.13
Dy4.721.602.206.723.327.735.51
Er2.900.791.073.491.694.152.89
Eu1.330.860.931.621.371.781.58
Gd4.442.272.748.805.409.617.17
Ho0.990.290.401.270.611.491.03
La12.5815.066.8239.2552.3939.4248.25
Lu0.410.110.140.430.220.520.39
Nb5.343.952.658.017.208.528.70
Nd16.9115.6811.6450.1845.8451.7047.62
Pr3.804.102.3912.2512.3512.4512.55
Rb13.3183.59115.4946.55126.7326.3769.27
Sm4.052.853.0310.707.3911.298.74
Sr209.42470.94527.18390.20477.28317.05380.44
Ta0.420.290.250.460.700.501.05
Tb0.730.290.391.230.681.381.00
Th1.745.973.1812.4417.7611.5312.49
Tm0.420.110.160.470.220.570.40
U0.640.610.450.802.020.811.70
V314.2845.3037.07107.5595.12182.06167.57
Y23.267.199.8329.7715.2834.8725.38
Yb2.760.730.952.941.443.562.55
Comp. 1%3%30%
Comp. 2%39%10%
Comp. 3%*58%60%
Comp. 4%0%0%
χ2 value19.408.57
P-value0.370.97

Associated IDL model results and the relative contributions of each host lithology, plus χ2 and P-values for the modelled pseudotachylyte are also presented.

* Component 3: tonalite–gneiss, see Table 6, component number 2.