Characteristics of "Guangyuan-Wangcang" trough during Late Middle Permian and its petroleum geological significance in northern Sichuan Basin, SW China

WANG Xingzhi,LI Bo,YANG Xiyan,WEN Long,XU Liang,XIE Shengyang,DU Yao,FENG Mingyou,YANG Xuefei,WANG Yaping,PEI Senqi

Table 1. Geochemical test results of Maokou Formation top in the Chejiaba profile of Guangyuan.

Sample No. Lithology Element content mNi/mCo Uau (mCu+mMo)/mZn mAl/(mAl+mFe+mMn) δCe Al2O3/% Fe2O3/% SiO2/% MnO/% La/(μg·g-1) Ce/(μg·g-1) Co/(μg·g-1) Cu/(μg·g-1) Hf/(μg·g-1) Mo/(μg·g-1) Nd/(μg·g-1) Ni/(μg·g-1) Sc/(μg·g-1) Th/(μg·g-1) Zn/(μg·g-1) Zr/(μg·g-1) CJBs1 Bioclastic limestone 0.5 0.6 0.6 1.1 Less than 0.1 0.53 0.3 0.4 0.1 0.05 5.0 1.4 0.67 4.62 0.33 -0.214 CJBs2 Bioclastic limestone 1.4 2.1 0.8 1.7 0.1 2.35 1.0 7.6 0.3 0.21 8.0 2.9 9.50 5.88 0.51 -0.135 CJBs3 Bioclastic limestone 2.1 3.1 0.7 4.9 Less than 0.1 1.43 1.8 6.1 0.5 0.20 7.0 2.7 8.71 4.38 0.90 -0.164 CJBs4 Bioclastic limestone 1.0 1.1 0.8 2.4 0.1 2.84 0.7 22.0 0.3 0.14 14.0 2.7 27.50 5.66 0.37 -0.268 CJBz5 Argillaceous bioclastic limestone* 0.37 0.19 13.25 0.02 1.1 1.4 0.5 1.4 0.1 2.10 0.7 7.3 0.2 0.18 7.7 2.6 9.20 5.59 0.45 0.64 -0.194 CJBd6 Siliceous rock 1.33 1.01 84.48 0.01 6.8 4.5 2.8 30.8 0.2 52.50 4.7 3 929.9 0.7 0.34 104.0 8.4 1 355.07 11.82 0.80 0.57 -0.487 CJBd7 Siliceous rock 1.96 0.88 55.24 0.01 21.6 26.4 4.4 50.3 1.4 74.90 15.8 302.0 3.6 2.32 184.0 53.0 68.64 23.23 0.68 0.69 -0.227 CJBd8 Siliceous rock 0.36 1.59 87.57 0.02 2.9 2.4 1.3 15.5 Less than 0.1 25.50 1.9 2 960.0 0.4 0.17 64.0 2.6 2 276.92 5.85 0.64 0.18 -0.384 CJBd9 Siliceous rock 0.82 1.26 85.94 0.01 10.1 10.4 3.9 24.1 0.4 29.70 7.1 2 820.0 1.5 0.97 82.0 16.4 723.08 9.13 0.66 0.39 -0.297 CJBd10 Siliceous rock 0.36 1.59 90.19 0.02 5.4 4.5 4.8 61.6 0.1 36.50 3.4 3 480.0 0.6 0.42 88.0 9.3 725.00 6.96 1.11 0.18 -0.377 CJBd11 Siliceous rock 0.71 1.06 86.45 0.01 6.9 4.6 2.9 30.9 0.3 52.60 4.8 3 930.0 0.8 0.44 128.0 8.5 1 355.17 6.28 0.65 0.40 -0.484 CJBd12 Siliceous rock 1.42 0.90 85.45 0.01 5.1 5.3 3.8 31.6 0.4 53.30 5.5 3 823.0 1.5 0.61 98.0 9.2 1 006.05 8.93 0.87 0.61 -0.348 CJBz13 Argillaceous bioclastic limestone* 0.46 0.21 12.63 0.02 4.3 3.8 0.9 6.2 Less than 0.1 25.50 1.2 56.0 0.5 0.14 78.0 4.0 157.30 5.45 0.41 0.67 -0.291 CJBd14 Siliceous rock 1.52 1.02 82.28 0.01 6.3 4.8 1.3 30.3 0.2 52.00 4.2 3 330.0 0.2 0.38 120.0 7.9 2 561.54 8.90 0.69 0.59 -0.422 CJBd15 Siliceous rock 1.28 0.93 83.96 0.02 5.1 3.4 1.5 29.1 0.7 50.80 3.0 2 910.0 0.1 0.26 118.0 6.7 1 940.00 10.14 0.67 0.57 -0.467 CJBd16 Siliceous rock 1.67 1.08 80.22 0.01 6.6 5.2 2.4 30.6 0.9 52.30 4.5 3 060.0 1.6 0.76 122.0 8.2 1 275.00 12.48 0.68 0.61 -0.410 CJBd17 Siliceous rock 1.59 1.36 67.34 0.02 16.5 17.1 3.7 60.2 1.7 550.00 13.5 528.0 5.2 6.37 530.0 69.0 142.70 34.98 1.15 0.54 -0.312 CJBz18 Argillaceous bioclastic limestone* 0.30 0.16 13.31 0.01 7.0 4.1 1.1 43.2 Less than 0.1 145.50 3.9 176.0 0.8 0.21 139.0 6.7 160.00 30.43 1.36 0.64 -0.518 CJBd19 Siliceous rock 1.28 1.75 83.85 0.03 9.0 10.2 3.6 31.7 0.8 191.00 7.3 314.0 2.8 1.76 190.0 32.0 87.22 30.61 1.17 0.42 -0.272