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Home All issues Volume 191 (2020) BSGF - Earth Sci. Bull., 191 (2020) 26 Full HTML
Chaîne varisque
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Table 2

Geochemical data for the dated rocks.

Rock-type Granite-Gneiss Vaugnerite Vaugnerite Vaugnerite Vaugnerite
Location Grande Roche Clefcy quarry Barançon quarry Habeaurupt roadside Tête des Sapins
Sample # Vo14-16 Vo15-01 Vo15-04 Vo15-07 Vo15-08
Easting (°) 7.01681 6.98594 7.03574 7.01245 6.78311
Northing (°) 48.15902 48.16719 48.17156 48.14884 47.84628
Major elements (%) by ICP-AES
  DL          
   SiO2 0.01 73.06 48.3 55.46 58.21 49.27
   Al2O3 0.01 13.36 9.47 15.48 16.08 10.86
   Fe2O3(T) 0.01 2.04 8.11 7.71 5.63 9.08
   MnO 0.001 0.02 0.126 0.11 0.073 0.161
   MgO 0.01 0.33 14.74 6.84 5.32 15.21
   CaO 0.01 0.51 6.44 5.23 3.38 8.56
   Na2O 0.01 2.57 1.14 2.68 2.58 1.15
   K2O 0.01 5.29 5.3 3.39 5.55 2.73
   TiO2 0.001 0.232 1.045 0.876 0.993 0.519
   P2O5 0.01 0.2 1.96 0.32 0.66 0.19
   LOI 0.01 0.76 2.04 1.33 1.35 2.72
   Total   98.37 98.69 99.42 99.82 100.4
Trace elements (μg/g) by ICP-AES
   Sc 1 4 20 17 15 37
   Be 1 3 7 4 8 2
   V 5 16 124 126 106 157
   Ba 3 364 1472 827 1868 961
   Sr 2 52 427 406 520 266
   Y 2 44 31 21 25 19
   Zr 4 153 315 223 448 131
Trace elements (μg/g) by ICP-MS
   Cr 20 <20 950 310 270 910
   Co 1 2 47 32 22 56
   Ni 20 <20 250 110 60 250
   Cu 10 <10 20 30 30 30
   Zn 30 <30 70 80 70 50
   Ga 1 18 14 20 24 10
   Ge 1 2 1 1 2 1
   As 5 <5 7 <5 8 17
   Rb 2 315 370 155 280 97
   Nb 1 11 20 15 21 3
   Mo 2 <2 <2 <2 <2 <2
   Ag 0.5 <0.5 <0.5 <0.5 0.9 <0.5
   In 0.2 <0.2 <0.2 <0.2 <0.2 <0.2
   Sn 1 10 9 7 11 3
   Sb 0.5 <0.5 <0.5 <0.5 <0.5 1.1
   Cs 0.5 23.2 34.2 17.1 35.9 11.9
   La 0.1 23 53.5 47.3 72 20.4
   Ce 0.1 49.9 120 89.3 143 41.8
   Pr 0.05 5.7 16.3 10.2 16 4.94
   Nd 0.1 19.9 75.8 36 58.4 20.9
   Sm 0.1 4.7 19.3 6.9 9.7 4.7
   Eu 0.05 0.5 3.12 1.45 2.03 1.28
   Gd 0.1 4.8 11.9 4.8 6.2 4.6
   Tb 0.1 0.9 1.3 0.7 0.9 0.7
   Dy 0.1 6.4 6 3.9 4.5 3.7
   Ho 0.1 1.3 1 0.7 0.7 0.7
   Er 0.1 4 2.7 1.8 2.1 1.7
   Tm 0.05 0.61 0.34 0.29 0.32 0.23
   Yb 0.1 3.8 2.2 1.7 2 1.5
   Lu 0.04 0.57 0.33 0.27 0.32 0.24
   Hf 0.2 3.7 1.9 5.2 9.1 2.6
   Ta 0.1 1.7 1.5 1.4 2.2 0.1
   W 1 6 1 2 5 2
   Tl 0.1 1.7 4.4 1.3 1.8 0.9
   Pb 5 19 21 35 35 14
   Bi 0.4 <0.4 <0.4 <0.4 <0.4 <0.4
   Th 0.1 16.2 48.7 19.6 19.1 12.2
   U 0.1 4.1 19.9 4.4 11.3 4.4
Selected parameters
   mg#   24 78 64 65 77
   fn1 (Fig. 6D)     6.85 -0.11 2.40 0.35
   fn2 (Fig. 6D)     1.31 0.94 1.29 0.87
   ASI   1.28 0.70 1.21 1.21 0.86
   ∑REE   126 314 205 318 107
   Eu/Eu*   0.32 0.63 0.77 0.80 0.84
   (La/Yb)N   4 17 19 24 9
   Ba/Rb   1.2 4.0 5.3 6.7 9.9
   Rb/Sr   6.1 0.9 0.4 0.5 0.4
   Tsat Zr (°C) (1)   801 641 758 844 606

DL: detection limit. LOI: loss on ignition. mg# = 100 x Mg/(Fetotal + Mg) (atomic ratios). fn1 and fn2 are composite factors computed after Scarrow et al. (2008) classification of K-rich granitoids. ASI = Al/(Na + K + 2Ca) (at.), aluminium saturation index. (./.)N denotes a ratio of values normalized to the chondrite reference of Sun and McDonough (1989). Eu/Eu* is the square root of (Eu/Gd)N x (Eu/Sm)N. (1) TSatZr are zircon saturation temperatures computed after Watson and Harrison (1983).

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