北祁连西段熬油沟组玄武岩地球化学特征及构造意义
刘懿馨, 侯克选, 沙鑫, 马蓁, 王金荣

Geochemical Characteristics and Tectonic Significance of Aoyougou Group Basalts in Western North Qilian
Yixin Liu, Kexuan Hou, Xin Sha, Zhen Ma, Jinrong Wang
表1 北祁连西段熬油沟组玄武岩主微量元素(%)、微量元素(×10-6)分析结果
Table 1 The contents of major (%) and trace elements (×10-6)of Aoyougou Group Basalts in the Western North Qilian
样号 14-KW-H30 14-KW-H31 14-KW-H32 14-KW-H33 14-KW-H34 14-KW-H35 14-KW-H36
SiO2 44.86 44.56 45.64 45.56 48.07 46.78 46.64
Al2O3 15.64 16.15 15.72 15.16 15.47 15.71 15.59
TiO2 2.90 2.43 2.50 2.30 1.96 2.55 2.39
TFe2O3 13.01 10.99 11.30 10.58 10.49 11.53 11.04
MnO 0.65 0.85 0.72 0.46 0.46 0.63 0.55
MgO 6.71 6.35 5.68 5.99 5.37 5.80 5.75
CaO 2.57 2.99 3.22 5.51 3.56 2.74 3.67
Na2O 1.91 1.08 1.72 1.61 1.60 2.07 2.57
K2O 4.33 6.07 5.36 5.13 6.01 4.95 4.27
P2O5 0.49 0.56 0.54 0.51 0.47 0.56 0.52
LOI 6.41 7.27 7.01 6.40 6.05 6.12 6.59
Total 99.48 99.30 99.41 99.21 99.51 99.44 99.58
Mg# 48 51 48 50 48 48 48
Ba 1 280 3 810 2 380 1 790 2 040 1 890 1 290
Rb 42.80 67.20 83.00 68.40 86.80 64.60 40.00
Cs 2.99 3.49 3.32 2.89 3.18 3.21 2.75
Th 3.12 3.19 3.65 3.13 3.37 3.71 3.30
U 0.80 0.73 0.78 0.94 0.77 0.80 0.79
Nb 43.90 36.20 36.90 42.00 36.90 37.90 39.00
Ta 3.55 2.75 2.78 3.02 2.86 2.88 2.98
Pb 4.27 3.81 4.03 3.19 3.81 6.15 3.08
Sr 211.00 275.00 312.00 307.00 250.00 257.00 236.00
Zr 272.00 236.00 236.00 264.00 238.00 248.00 252.00
Hf 6.81 5.59 5.96 6.27 5.80 6.04 6.19
P 2 140 2 446 2 358 2 227 2 052 2 446 2 271
Cr 246.00 165.00 181.00 223.00 123.00 170.00 207.00
Ni 134.00 96.10 93.30 107.00 54.80 94.90 91.10
Co 50.20 39.60 38.80 37.40 28.00 45.00 34.60
V 274.00 229.00 220.00 204.00 169.00 236.00 213.00
Sc 24.90 20.60 21.80 15.50 16.70 24.20 20.60
Ga 24.00 21.20 21.20 22.30 20.70 21.50 21.30
La 27.90 29.00 36.90 35.80 33.90 36.80 31.10
Ce 61.60 63.80 81.20 79.40 75.90 78.20 67.20
Pr 7.85 8.53 10.40 9.82 9.25 10.20 8.28
Nd 31.20 35.60 42.80 40.20 37.10 41.20 32.40
Sm 7.43 8.24 9.15 8.69 8.47 9.40 7.46
Eu 2.54 3.30 3.33 3.10 2.96 3.28 2.66
Gd 7.23 7.56 8.76 8.17 7.62 8.75 7.07
Tb 1.18 1.19 1.38 1.29 1.23 1.45 1.11
Dy 6.58 6.44 7.30 6.53 6.36 7.39 5.96
Ho 1.23 1.20 1.34 1.23 1.22 1.35 1.11
Er 3.24 3.06 3.42 3.06 3.12 3.56 2.90
Tm 0.46 0.42 0.47 0.43 0.44 0.48 0.42
Yb 2.89 2.60 2.91 2.72 2.75 2.96 2.60
Lu 0.43 0.38 0.42 0.38 0.40 0.41 0.38
Y 30.10 27.50 31.00 26.40 25.50 31.80 24.80
∑REEEE 191.86 198.82 240.78 227.22 216.22 237.23 195.45
LREE 138.52 148.47 183.78 177.01 167.58 179.08 149.10
HREE 53.34 50.35 57.00 50.21 48.64 58.15 46.35
LREE/HREE 2.60 2.95 3.22 3.53 3.45 3.08 3.22
δEu 1.02 1.12 1.06 1.05 1.05 1.04 1.05
δCe 0.86 0.86 0.87 0.87 0.88 0.87 0.87
(La/Yb)N 6.92 8.00 9.10 9.44 8.84 8.92 8.58
Nb /U 54.88 49.59 47.31 44.68 47.92 47.38 49.37