Bull. Nagoya Univ. Museum No. 20, 79 91, 2004 Quantitative chemical analysis of rocks with X-ray fluorescence analyzer XRF-1800 NAKAZAKI Mineko TSUBOI Motohiro KANAGAWA Kazuyo KATO Takenori SUZUKI Kazuhiro Center for Chronological Research, Nagoya University, Chikusa, Nagoya 464-8602, Japan Graduate School of Enviromental Studies, Nagoya University, Chikusa, Nagoya 464-8602, Japan Abstract This paper describes analytical procedures to determine 10 major and 15 trace elements in silicate rocks, using an X-ray fluorescence analyzer (Shimadzu SXF 1800) with a Rh target at the Center for Chronological Research, Nagoya University. Analyses are carried out on glass bead prepared through fusion of sample and flux (Li 2 B 4 O 7 ) mixture in the proportion of 0.7g : 6.0g for major elements (Si, Ti, Al, Fe, Mn, Mg, Ca, Na, K, P ) and 2g : 3g for trace elements (V, Cr, Co, Ni, Cu, Zn, As, Rb, Sr, Y, Zr, Nb, Ba, Pb, Th). Calibration curves for the major elements cover a wide compositional range of igneous, metamorphic and sedimentary silicate rocks. Calibration curves for the trace elements are corrected for spectral line-overlap and matrix effect, and carry out reliable analyses at concentration above 2-10ppm. 79
θ θ α α α α α 80
αα αα α α θ αα α αα α 81
JB-1a JB-2 JB-3 JG-1a JG-2 JG-3 JGb-1 JA-1 JA-2 SiO 2 52.41 53.25 50.96 72.30 76.83 67.29 43.66 63.97 56.42 TiO 2 1.28 1.19 1.44 0.25 0.044 0.48 1.60 0.85 0.66 Al 2 O 3 14.45 14.64 17.20 14.30 12.47 15.48 17.49 15.22 15.41 Fe 2 O 3 * 9.05 14.25 11.82 2.00 0.97 3.69 15.06 7.07 6.21 MnO 0.148 0.218 0.177 0.057 0.016 0.071 0.189 0.157 0.108 MgO 7.83 4.62 5.19 0.69 0.037 1.79 7.85 1.57 7.60 CaO 9.31 9.82 9.79 2.13 0.70 3.69 11.90 5.70 6.29 Na 2 O 2.73 2.04 2.73 3.39 3.54 3.96 1.20 3.84 3.11 K 2 O 1.40 0.42 0.78 3.96 4.71 2.64 0.24 0.77 1.81 P 2 O 5 0.26 0.101 0.294 0.083 0.002 0.122 0.056 0.165 0.146 H 2 O (+) 0.92 0.25 0.18 0.59 0.33 0.67 1.28 0.72 1.12 H 2 O ( ) 0.92 0.13 0.07 0.12 0.12 0.17 0.13 0.30 1.25 Total 100.71 100.93 100.63 99.87 99.77 100.05 100.66 100.33 100.13 JA-3 JR-1 Ol-neph CO01 CO02 CO03 2401C 2401D 2401F SiO 2 62.27 75.45 41.01 58.64 47.88 53.80 42.99 42.82 47.85 TiO 2 0.70 0.11 3.85 0.65 1.07 0.00 4.10 3.65 2.26 Al 2 O 3 15.56 12.83 8.45 11.39 23.20 9.53 14.00 12.94 16.81 Fe 2 O 3 * 6.60 0.89 15.23 7.30 12.91 4.20 15.42 14.75 10.93 MnO 0.104 0.099 0.18 0.14 0.18 0.00 0.17 0.17 0.23 MgO 3.72 0.12 15.49 12.39 4.19 22.36 5.78 6.80 2.79 CaO 6.24 0.67 11.95 4.40 8.90 0.32 11.11 12.54 8.56 Na 2 O 3.19 4.02 2.23 2.90 1.83 1.24 1.98 3.07 5.97 K 2 O 1.41 4.41 0.67 0.616 0.39 6.55 1.44 0.88 2.59 P 2 O 5 0.116 0.021 1.07 0.12 0.09 0.00 0.73 0.58 0.53 H 2 O (+) 0.20 1.16 H 2 O ( ) 0.11 0.20 Total 100.22 99.98 100.13 98.55 100.64 98.00 97.72 98.20 98.52 82
JA-1 JA-2 JA-3 JB-1a JB-2 JB-3 JF-1 JF-2 JG-1a V 105 126 169 205 575 372 5.43 4.86 22.7 Cr 7.83 436 66.2 392 28.1 58.1 5.48 2.47 17.6 Co 12.3 29.5 21.1 38.6 38 34.3 0.12 0.68 5.9 Ni 3.49 130 32.2 139 16.6 36.2 1.36 1.38 6.91 Cu 43 29.7 43.4 56.7 225 194 0.82 0.78 1.67 Zn 90.9 64.7 67.7 82.1 108 100 4.41 1.4 36.5 Rb 12.3 72.9 36.7 39.2 7.37 15.1 266 218 178 Sr 263 248 287 442 178 403 172 200 187 Y 30.6 18.3 21.2 24 24.9 26.9 2.84 2.67 32.1 Zr 88.3 116 118 144 51.2 97.8 38.6 6.73 118 Nb 1.85 9.47 3.41 26.9 1.58 2.47 0.74 0.7 11.4 Ba 311 321 323 504 222 245 1750 298 470 Pb 6.55 19.2 7.7 6.76 5.36 5.58 33.4 48.7 26.4 Th 0.82 5.03 3.25 9.03 0.35 1.27 1.17 0.31 12.8 As 2.78 0.85 4.68 2.3 2.87 1.84 0.92 0.28 0.43 JG-2 JG-3 JGb-1 JP-1 JR-1 JR-2 Ol-neph 9G3 9B1a V 3.78 70.1 635 27.6 7 3 66 198 Cr 6.37 22.4 57.8 2807 2.83 3.1 606 689 1042 Co 3.62 11.7 60.1 116 0.83 0.46 60.8 76 101 Ni 4.35 14.3 25.4 2460 1.67 1.99 38.5 133 248 Cu 0.49 6.81 85.7 6.72 2.68 1.36 60 105 Zn 13.6 46.5 109 41.8 30.6 27.8 72 105 Rb 301 67.3 6.87 0.8 257 303 59 37 Sr 17.9 379 327 3.32 29.1 8.11 1080 1478 1541 Y 86.5 17.3 10.4 1.54 45.1 51.1 42.1 304 310 Zr 97.6 144 32.8 5.92 99.9 96.3 159 165 Nb 14.7 5.88 3.34 1.48 15.2 18.7 176 195 Ba 81 466 64.3 19.5 50.3 39.5 1250 1529 1568 Pb 31.5 11.7 1.92 0.12 19.3 21.5 107 103 Th 31.6 8.28 0.48 0.19 26.7 31.4 137 138 As 0.68 0.37 1.09 0.34 16.3 19.2 10R2 13F1 14G1a 14B3 15B1a JB2As1 JB2As2 JB2As3 JB2Pb V 7 3 21 345 198 567 570 571 569 Cr 595 31 63 101 464 28 28 28 28 Co 80 161 185 212 125 37 38 38 38 Ni 32 597 703 732 934 16 16 16 16 Cu 95 173 196 373 282 222 223 223 223 Zn 81 139 207 267 266 106 107 107 107 Rb 1462 339 240 90 67 7 7 7 7 Sr 7 229 394 583 856 175 177 177 176 Y 102 175 95 92 135 25 25 25 25 Zr 565 325 276 262 264 50 51 51 51 Nb 86 57 32 23 136 1.6 1.6 1.6 1.6 Ba 115 2898 1211 1024 447 219 220 220 220 Pb 375 197 153 134 115 5.3 5.3 5.3 3432 Th 83 20 75 65 287 0.3 0.3 0.3 0.3 As 3026 504 86 83
84
α αα α αα α αα α 1 2 3 4 5 6 7 SiO 2 43.3 43.3 43.0 43.1 42.9 43.2 43.3 TiO 2 1.57 1.57 1.57 1.57 1.56 1.57 1.57 Al 2 O 3 17.3 17.3 17.1 17.1 17.0 17.3 17.3 Fe 2 O 3 14.8 14.8 14.8 14.8 14.8 14.7 14.8 MnO 0.17 0.17 0.17 0.17 0.17 0.17 0.17 MgO 7.70 7.68 7.58 7.61 7.50 7.67 7.70 CaO 11.9 11.9 11.9 11.9 11.9 11.9 11.9 Na 2 O 1.06 1.08 1.37 1.39 1.53 1.11 1.06 K 2 O 0.19 0.19 0.21 0.21 0.21 0.19 0.19 P 2 O 5 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Total 98.0 98.0 97.8 97.9 97.6 97.9 98.0 85
θ α α α α α α α α α α θ α β β α α α α α β α α α α α α α α α α α α α α α α θ αααα 86
θ α αααα α θ θ α β α β α β α β α β α α α ββ α β I VKα = I VKα * k I TiKα 87
α θ θ θ α β θ θ α β α β α β α β α β α α α I VKα = I* VKα 0.02952 I TiKα I CrKα = I* CrKα 0.08168 I VKα I CrKα = I* CrKα 0.08168 (I* VKα 0.02952 I TiKα ) 88
I YKα = I* YKα 0.17896 IRbKα I NbKα = I* NbKα 0.08263 I YKα I NbKα = I* NbKα 0.08263 (I* YKα 0.17896 IRbKα ) I Zr Kα = I* Zr Kα 0.16737 I SrKα I BaLα = I* BaLα 0.07291 I TiKα β α Wi = ( a I 2 + b I + c ) (1 + Σdj Wj ) σ = I Peak +IBackground 2IBackground ; I peak I background c= 3 2IBackground /( A t)t σ α β α α β β α α β 89
90
Imai, N., Terashima, S., Itoh, S. and Ando, A. (1995) 1994 compilation values for GSJ reference samples, Igneous rock series. Geochemical J., 29, 91-95. Suzuki, K. (1986) Enrichment of incompatible elements at grain-boundaries of olivine in an olivinenephelinite. Geochemical J., 20, 17-27. 91