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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 |
The Second Institute of Geology and Minerals Exploration, Gansu Bureau of Geology and Mineral Exploration and Development,Lanzhou 730020,China |
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Abstract This study focuses on the C and O isotope signature for the rocks from the Permian?Triassic boundary in Guanba area of Qianxi, Guizhou Province. The result reveals that δ13C has a distinct negative drift,and the δ18O drops abruptly. Three layers of tuff,recognized at the boundary,have recorded the volcanic events that occurred in late Permian to early Triassic in this area . The volcanic events led to the abrupt change of sedimentary environments and ultimately triggered the mass extinction during the end of Permian.
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Received: 23 March 2018
Published: 24 October 2018
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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 |
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