贵州省黔西县官坝地区二叠系-三叠系地质界面碳、氧同位素特征及意义

杨斌, 赵飞, 何碧, 王宁祖, 张文斌, 张志玺, 李伟

Carbon and oxygen isotope geochemistry of the Permian-Triassic boundary in Guanba area of Qianxi,Guizhou Province, and its significance

Bin YANG, Fei ZHAO, Bi HE, Ning-Zu WANG, Wen-Bin ZHANG, Zhi-Xi ZHANG, Wei LI

表2 凝灰岩样品主量元素、微量元素分析结果及参数

样品编号 PM315-DH5 PM315-DH6 PM315-DH7 PM315-DH9 PM315-DH10 PM315-DH11 PM315-DH13 SiO2 55.78 56.65 56.12 78.45 79.89 52.11 56.12 TiO2 0.27 0.28 0.26 0.27 0.27 0.43 0.45 Al2O3 22.85 22.74 22.88 11.12 10.18 25.65 22.64 Fe2O3 1.03 0.94 0.90 1.03 0.74 1.36 1.96 FeO 0.09 0.09 0.13 0.40 0.45 0.40 0.40 MnO 0.009 0.010 0.008 0.006 0.012 0.008 0.031 MgO 3.06 3.02 3.02 1.15 1.15 3.08 2.45 CaO 1.03 0.59 0.74 0.25 0.37 0.32 0.56 Na2O 0.55 0.51 0.85 0.27 0.33 0.48 0.42 K2O 6.68 6.72 6.65 3.16 2.92 7.07 6.24 P2O5 0.096 0.066 0.071 0.039 0.085 0.091 0.10 烧失量 8.52 8.32 8.30 3.78 3.56 8.96 8.56 总量 99.97 99.94 99.93 99.93 99.96 99.96 99.93 w(SiO2)/w(Al2O3) 2.44 2.49 2.45 7.05 7.85 2.03 2.48 w(TiO2)/w(Al2O3) 0.012 0.012 0.011 0.024 0.027 0.017 0.020 Rb 226.000 217.800 220.500 91.200 95.400 245.700 191.70 Ba 265.00 283.88 278.63 138.25 150.00 298.00 294.63 Th 52.30 56.30 52.90 27.76 22.52 61.46 47.14 U 13.80 13.09 12.75 6.28 4.52 8.93 4.00 Ta 3.96 4.56 4.30 1.74 1.68 3.46 3.02 Nb 40.300 41.600 39.312 17.971 13.800 28.220 21.200 Sr 35.20 26.46 22.37 35.93 28.58 27.60 34.20 Zr 318.00 317.84 300.44 265.64 231.30 371.90 377.46 Hf 10.84 10.52 10.35 7.26 6.42 13.31 12.75 Co 3.91 5.18 5.50 3.32 4.96 15.56 13.27 Ni 9.52 8.89 8.88 4.63 6.07 17.20 23.00 Ga 28.60 28.28 28.70 13.02 12.67 29.05 24.29 Pb 38.60 37.20 38.22 20.44 29.60 27.89 26.55 Cr 5.21 5.21 5.37 4.98 7.97 7.23 14.08 Sc 17.60 17.60 17.93 9.52 8.36 22.77 23.10 La 135.60 132.00 106.20 56.30 40.92 130.80 114.84 Ce 212.06 217.67 185.13 105.58 77.08 243.47 231.13 Pr 31.20 29.18 23.20 12.08 8.61 28.46 27.27 Nd 108.903 110.128 87.833 44.200 31.483 103.513 105.963 Sm 22.60 23.70 18.90 8.11 6.33 17.50 19.90 Eu 1.420 1.320 1.147 1.059 0.946 1.835 2.60 Gd 20.20 18.16 17.11 7.23 6.46 14.04 16.05 Tb 3.82 3.34 3.49 1.32 1.28 2.25 2.68 Dy 24.23 21.60 23.05 8.20 7.99 12.11 15.05 Ho 5.41 4.73 5.30 1.87 1.73 2.56 3.20 Er 16.70 14.28 16.47 5.76 5.10 7.57 9.11 Tm 2.78 2.51 2.71 0.96 0.85 1.27 1.41 Yb 18.60 15.79 17.26 6.36 5.32 8.12 8.60 Lu 2.57 2.27 2.46 0.94 0.77 1.14 1.21 Y 163.00 134.60 155.25 48.60 48.50 68.58 101.93 ΣREE 606.09 596.68 510.26 259.97 194.87 574.64 559.01 LREE 511.78 514.00 422.41 227.33 165.37 525.58 501.70 HREE 94.31 82.68 87.85 32.64 29.50 49.06 57.31 w(LREE)/w(HREE) 5.43 6.22 4.81 6.96 5.61 10.71 8.75 δEu 0.20 0.19 0.19 0.41 0.45 0.35 0.43 δCe 0.77 0.82 0.87 0.95 0.96 0.93 0.98 LaN/YbN 5.23 6.00 4.41 6.35 5.52 11.55 9.58