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Table 4. Geochemical data for basement rocks from the field trip area.
Stop
1
--
2
3
3
4
Map Unit
Ygg
Ygg
Ypqd
Ygg
Ypqd
Ylgn
Sample
SNP-03-197
SNP-01-164
SNP-01-175
SNP-01-174
SNP-01-155
SNP-01-150
SiO2 64.10 68.94 55.29 72.51 63.51 66.49
TiO2 0.23 0.51 1.71 0.45 1.20 0.79
Al2O3 18.44 16.13 16.49 14.63 15.18 15.83
Fe2O31 6.59 3.02 9.33 1.92 9.19 5.08
MnO 0.26 0.03 0.14 0.03 0.13 0.07
MgO 0.28 0.42 4.78 0.40 4.54 1.04
CaO 2.92 1.30 6.54 1.17 1.93 3.43
Na2O 4.13 2.59 3.00 2.14 1.85 2.95
K2O 2.71 6.50 2.00 6.18 2.66 4.43
P2O5 0.11 0.16 0.52 0.14 0.05 0.20
Total 99.77 99.60 99.80 99.55 100.23 100.31
Rb 65.9 173.3 57.9 155.7 111.4 193.9
Ba 786 1524 1030 1198 726 896
Sr 511 327 993 308 194 213
Pb 39 44 11 49 17 26
Th2 38.20 21.68 0.59 50.9 5.9 3.6
U 1 0.8 0.63 1.9 1.1 n.d
Zr 331 305 188 286 259 388
Hf 10.38 10.98 6.55 9.30 7.88 11.37
Nb 7.8 7.9 6.7 4.4 12.1 12.5
Ta 0.42 0.47 0.70 0.60 1.10 1.28
Ni 1 3 32 3 35 5
Zn 41 54 130 23 192 87
Cr 20 24 144 30 139 34
Ga 27 24 25 17 22 23
V 1 17 161 11 168 45
La 103.2 100.6 39.2 120.2 35.0 45.7
Ce 323.4 203.1 79.4 264.1 70.0 108.7
Nd 121.4 79 47 102 32 54.5
Sm 16.83 9.55 8.43 17.12 6.56 10.85
Eu 2.02 2.48 2.66 2.00 1.91 2.01
Tb 1.65 0.71 1.04 1.37 1.51 1.77
Yb 5.21 1.1 1.80 2.0 5.7 4.6
Lu 0.79 0.16 0.28 0.25 0.92 0.65
Y 38.8 12.4 21.8 24.3 53.4 52.7
Sc 5.04 4.38 20.24 4.04 24.29 14.02
Ga/Al 2.77 2.81 2.86 2.20 2.74 2.75
A/CNK 1.23 1.18 0.87 1.19 1.61 1.00
FeOt/(FeOt+MgO) 0.95 0.87 0.64 0.81 0.65 0.81
Stop
4
5
5
6
7
--
Map Unit
dike
Ycf
Ycf
Ycf
Yg
Yfqj
Sample
SNP-01-149
SNP-01-142
SNP-01-143
SNP-96-10
SNP-96-1
SNP-96-17
SiO2 50.03 74.58 70.09 69.78 68.37 63.75
TiO2 2.72 0.30 0.46 0.74 0.64 1.29
Al2O3 14.03 12.84 14.22 13.64 14.93 15.22
Fe2O31 10.10 2.57 4.09 4.23 4.22 5.97
MnO 0.15 0.02 0.04 0.07 0.06 0.09
MgO 6.61 0.25 0.40 0.66 0.70 1.23
CaO 7.12 1.00 1.93 2.29 2.45 3.51
Na2O 2.58 1.94 2.33 2.38 3.19 3.17
K2O 4.71 6.90 6.50 5.63 4.94 5.30
P2O5 1.61 0.04 0.15 0.19 0.18 0.47
Total 99.65 100.45 100.23 99.60 99.66 99.99
Rb 276 238.7 212.6 199.3 170.3 181.2
Ba 2388 563 870 668 986 1650
Sr 611 85 107 128 175 579
Pb 39 49 39 28 30 38
Th2 7.2 40.0 10.93 2.3 12.0 2.2
U 2.0 3.5 1 0.7 n.d. 1.4
Zr 644 444 474 260 330 501
Hf 17.1 14.7 15.84 11.2 10.7 15.1
Nb 13.4 11.5 19.0 9.3 9.6 14.6
Ta 2.10 0.46 1.10 0.85 0.64 1.49
Ni 123 3 3 3 7 3
Zn 154 66 90 63 81 120
Cr 267 21 19 28 34 22
Ga 22 19 24 21 21 25
V 142 5 10 25 36 44
La 109.7 258.4 94.8 52.8 58.0 102.0
Ce 226.4 477.0 224.5 94.3 105.0 185.0
Nd 112 165 102 47 47 91
Sm 17.22 23.50 17.91 10.30 10.00 19.10
Eu 3.7 1.81 2.70 2.09 1.82 3.31
Tb 1.97 1.41 2.26 1.50 1.25 2.30
Yb 3.60 2.6 5.6 3.4 2.2 5.3
Lu 0.49 0.35 0.73 0.42 0.23 0.60
Y 42.3 31.4 72.6 38.2 26.2 63.5
Sc 20.88 2.44 8.75 8.90 9.08 11.30
Ga/Al 2.96 2.79 3.19 2.91 2.66 3.10
A/CNK 0.63 1.03 0.99 0.96 0.99 0.88
FeOt/(FeOt+MgO) 0.58 0.90 0.90 0.85 0.84 0.81
Stop
--
--
11
12
13
14
Map Unit
Yor
Ygr-d
Yfpg
Yfh
Ybg
Yfqj
Sample
OR-97-35
OR-97-51
SNP-02-177
SNP-01-146
SNP-02-186
SNP-02-180
SiO2 72.18 72.85 67.36 69.69 62.41 53.24
TiO2 0.28 0.43 0.78 0.58 1.44 2.69
Al2O3 14.44 14.36 14.73 15.21 13.87 15.69
Fe2O31 2.76 1.61 5.34 3.80 9.13 11.96
MnO 0.06 0.03 0.08 0.05 0.15 0.18
MgO 0.34 0.44 0.95 0.68 0.81 2.14
CaO 1.15 1.38 2.72 1.87 3.97 6.51
Na2O 2.85 2.50 2.73 2.34 2.80 3.11
K2O 6.04 5.69 4.83 6.13 4.43 2.72
P2O5 0.10 0.23 0.22 0.15 0.69 1.31
Total 100.19 99.53 99.74 100.49 99.70 99.55
Rb 305.1 240.6 186.2 166.7 109.1 52.8
Ba 425 746 863 951 2112 1926
Sr 80 151 161 170 314 633
Pb 65 53 28 28 28 19
Th2 75.1 53.8 15.00 3.19 1.40 1.4
U 9.5 4.2 1.5 n.d. 0.83 0.5
Zr 230 392 336 239 1354 988
Hf 9.0 12.1 13.07 9.26 43 22.90
Nb 10.9 12.6 10.4 8.6 25.2 35.5
Ta 0.72 0.68 1.1 0.50 1.4 1.57
Ni 2 2 8 5 1 2
Zn 70 48 77 64 249 241
Cr 25 18 39 27 11 21
Ga 25 24 22 20 25 30
V 8 10 49 33 39 95
La 112.0 170.9 69.5 46.2 83.6 117.8
Ce 202.0 339 129.2 100.4 170 250.2
Nd 81 130 61 42.9 106 127
Sm 20.80 23.70 10.82 7.06 18.87 28.61
Eu 0.91 1.49 1.72 1.83 5.0 4.51
Tb 3.61 1.45 0 0.85 1.9 3.24
Yb 10.2 1.5 3.9 1.9 4.6 5.40
Lu 1.10 0.22 0.57 0.27 0.73 0.8
Y 62.6 32.4 40.1 20.5 58.6 84.1
Sc 6.27 2.72 12.57 10.84 20.0 20.82
Ga/Al 3.27 3.16 2.82 2.48 3.41 3.61
A/CNK 1.09 1.12 1.00 1.10 0.83 0.79
FeOt/(FeOt+MgO) 0.88 0.77 0.84 0.83 0.91 0.83
Stop
15
20
20
20
Map Unit
Ylg2
Ylgg
Yfqj
Yfqj
Sample
SNP-03-199
SNP-99-90
SNP-99-91
SNP-99-92
SiO2 75.67 74.26 62.57 58.59
TiO2 0.14 0.20 1.58 1.78
Al2O3 12.65 13.93 13.87 15.44
Fe2O31 0.85 1.94 9.45 10.79
MnO 0.02 0.02 0.12 0.17
MgO 0.01 0.22 0.85 2.99
CaO 0.61 0.79 3.26 2.16
Na2O 3.02 3.15 2.35 3.40
K2O 6.73 6.16 4.82 3.26
P2O5 0.02 0.04 0.60 0.85
Total 99.71 100.71 99.47 99.45
Rb 237.1 161.5 144.0 89.6
Ba 126 1009 2132 978
Sr 60 157 351 92
Pb 46 28 31 8
Th2 34.64 33.4 1.75 3.1
U 13 1.2 1.1 0.2
Zr 75 169 1676 1157
Hf 4.53 6.8 45.0 34.7
Nb 3.9 6.7 24.2 32.7
Ta 0.16 0.72 1.45 2.2
Ni 1 4 2 1
Zn 20 18 286 420
Cr 19 30 13 13
Ga 17 22 28 22
V 1 5 42 50
La 81.7 94 91.1 123.7
Ce 144.4 190 193 273
Nd 58.7 64 105 142
Sm 11.25 8.35 22.4 20.8
Eu 0.52 1.65 4.95 5.01
Tb 0.96 0.62 1.54 1.53
Yb 1.22 1.38 6.4 6.8
Lu 0.15 0.2 1.10 1.0
Y 10.6 8.1 69.7 83.1
Sc 3.19 3.75 18.71 20.35
Ga/Al 2.54 2.98 3.81 2.69
A/CNK 0.95 1.05 0.92 1.18
FeOt/(FeOt+MgO) 0.98 0.89 0.91 0.76

1total iron expressed as Fe2O3.
n.d.: not detected
2elements measured by instrumental neutron activation (INA) analysis noted in italics; all other elements measured by X-ray fluorescence.


U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubs.usgs.gov /circ/2004/1264/html/trip2/table4.html
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