青海省天峻县阳康地区花岗岩岩体锆石U-Pb年代学及地球化学特征研究

方永坤, 曹成刚, 董峻麟, 李领贵

Geochronology and geochemistry of the granodiorite intrusion in Yangkang area of Qinghai Province and its geological significance

FANG Yong-Kun, Cao Cheng-Gang, DONG Jun-Lin, LI Ling-Gui

表2 花岗闪长岩主量元素、稀土元素和微量元素含量及有关参数

Table 2 Major, REE and trace element content and parameter of the granodiorite in Yangkang

指标 PM07-3 PM07-8 PM017-7 PM017-8 QC8112 SiO2 68.14 69.05 64.72 67.81 68.83 LOS 0.69 0.9 2.02 1.82 1.33 FeO 3.88 3.42 2.83 3.68 3.95 Fe2O3 0.54 0.61 0.71 1.06 0.85 TiO2 0.38 0.29 0.37 0.53 0.55 Al2O3 14.9 14.06 16.87 13.53 13.08 CaO 2.52 1.91 2.92 2.29 2.58 MgO 0.44 0.37 1.19 1.89 1.73 K2O 3.91 3.9 3.51 3.81 3.86 Na2O 3.6 3.38 3.75 2.47 2.37 MnO 0.1 0.08 0.06 0.08 0.08 P2O5 0.07 0.07 0.1 0.15 0.15 Total 99.17 99.15 99.05 99.12 99.36 ALK 7.51 7.28 7.26 6.28 6.23 Na2O/K2O 0.92 0.87 1.07 0.65 0.61 A/CNK 1.007 1.059 1.104 1.094 1.024 Mg# 61.75 54.58 76.85 77.93 80.13 La 35.5 103 27.7 41.2 43.6 Ce 84.6 187 50.8 81.2 86.5 Pr 11.5 20.9 5.71 9.12 9.71 Nd 47.1 72.7 20.5 32.8 34.1 Sm 9.56 11.70 5.28 5.78 5.88 Eu 1.95 2.29 0.96 0.94 0.82 Gd 7.81 8.52 4.23 4.73 4.64 Tb 1.37 1.42 0.47 0.8 0.79 Dy 7.54 6.99 2.49 4.29 4.04 Ho 1.49 1.34 0.5 0.83 0.79 Er 4.13 3.68 1.39 2.29 2.19 Tm 0.69 0.6 0.24 0.38 0.38 Yb 4.24 3.85 1.51 2.42 2.42 Lu 0.65 0.61 0.24 0.39 0.36 Y 38.6 33.8 13.8 22.2 21.5 ΣREE 256.70 458.40 133.06 209.37 217.72 LREE 190.21 397.59 109.6 171.04 180.61 HREE 27.92 27.01 9.66 16.13 15.61 w(LREE)/w(HREE) 6.81 14.72 11.35 10.6 11.57 [w(La)/w(Yb)]N 5.64 26.75 18.34 17.02 18.02 δEu 0.67 0.67 0.98 0.53 0.46 δCe 1.00 0.92 0.92 0.97 0.97 Li 41.8 16.1 37.8 58.1 57.2 Ga 21.6 19.5 20.7 17.6 17.6 Rb 102 125 138 152 152 Sr 357 222 354 218 225 Nb 11.6 14.3 9.23 12.9 13.2 Ba 1089 1277 815 813 890 Ta 0.77 1 0.82 1.19 1.13 Th 5.1 19.7 9.45 19.5 18.7 Zr 270 496.3 157 194 184 Sn 2.6 2.3 1.8 2.4 2.9 Se 0.03 0 0.02 0.06 0.03 w(Nb)/w(Ta) 15.06 14.30 11.26 10.84 11.68 w(Rb)/w(Sr) 0.29 0.56 0.39 0.70 0.68 w(La)/w(Nb) 3.06 7.2 3.0 3.19 3.3