Stable Carbon Isotope Characteristics of Permian-Triassic Boundary at the Selong Xishan Section
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摘要: 古生代-中生代之交的生物灭绝过程和原因一直是科学家关注和致力解决的关键古生物学问题之一.色龙西山剖面的牙形石分带工作取得了重要进展，为认识该地区地层序列和沉积历史提供了新的证据.全岩碳同位素分析表明，在长兴阶与印度阶附近该剖面存在着碳同位素负偏，可以同我国华南多个剖面进行对比，揭示了古生代-中生代之交的碳同位素变化和生物灭绝模式具有全球对比性.新识别出的奥伦尼克阶底部（Neospathodus waageni带底部）碳同位素值大幅度负偏及之后的正偏，与华南等地的变化规律一致，反映了二叠纪末期到早三叠世长期的、复杂的生物和环境变化过程.Abstract: The process and cause about the mass extinction event across the Paleozoic-Mesozoic transition have always been one of the key paleontological issues in the past few decades. The conodont zoning of the Selong Xishan section has made important progress, providing new evidence for understanding the stratigraphic sequence and sedimentary history of the area. Carbon isotope analyses of bulk samples in this study indicate that there are negative shifts across the Changshingian-Induan Boundary, which are comparable to South China. Newly identified carbon isotope negative shift at earliest Olenekian, base of Neospathodus waageni zone and the following positive shift coincide with the pattern recognized in South China and other places, implying the multi-phase extinction-recovery processes in Early Triassic.
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Key words:
- carbon isotope /
- Permian-Triassic /
- conodont /
- Selong Xishan /
- biostratigraphy /
- geochemistry /
- stratigraphy
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图 1 西藏色龙地区地质图及构造位置
据潘桂棠等(2002)修改.Ⅲ2.拉达克-冈底斯-拉萨-腾冲陆块；Ⅲ2-1.昂龙岗日-班戈-腾冲燕山期岩浆弧带；Ⅲ2-4.革吉-措勤晚古生代复合弧后盆地带；Ⅲ2-5.隆格尔-工布江达断隆带；Ⅲ2-6.冈底斯-下察隅晚燕山-喜马拉雅期岩浆弧带；Ⅲ2-7.冈底斯南缘弧前盆地带；Ⅲ3.印度河-雅鲁藏布江结合带；Ⅲ4.印度陆块；Ⅲ4-1.北喜马拉雅特提斯沉积褶冲带；Ⅲ4-2.高喜马拉雅结晶岩带或基底逆冲带；Ⅲ4-3.低喜马拉雅褶冲带；Ⅲ4-4.锡瓦利克厚造山前陆盆地带
Fig. 1. The geological map and tectonic framework of Selong area, Tibet
图 2 西藏色龙西山PTB剖面野外露头照片
Fig. 2. Outcrop photographs of PTB at the Selong Xishan section, Tibet
图 3 西藏色龙西山剖面牙形石生物地层及δ13CPDB变化曲线
牙形石带划分方案据Yuan et al.(2018)修改
Fig. 3. Conodont biostratigraphy and curves of δ13CPDB at the Selong Xishan section, Tibet
图 4 西藏色龙西山剖面产出的典型牙形石
a.Hindeodus parvus，侧视；b.Neospathodus waageni，侧视
Fig. 4. Conodonts from the Selong Xishan section, Tibet
图 5 西藏色龙西山剖面与我国华南等地剖面δ13CPDB对比
其余剖面的碳同位素值来自Tong et al.(2007)
Fig. 5. Correlation of δ13CPDB between the Selong Xishan section and other well-studied Lower Triassic sections in South China
表 1 色龙西山剖面δ13CPDB和δ18OPDB同位素值测试结果
Table 1. The contents of δ13CPDB and δ18OPDB at the Selong Xishan section, Tibet
样品 δ13CPDB(‰) δ18OPDB(‰) TWS(6.55 m) -0.675 -10.790 TWS(6.2 m) -0.292 -13.330 TWS(6.0 m) -0.524 -15.480 TWS(5.8 m) 0.166 -12.598 TWS(5.6 m) -0.066 -14.623 TWS(5.5 m) 2.658 -11.960 TWS(5.4 m) 1.543 -13.417 TWS(5.2 m) 0.703 -12.420 TWS(5.0 m) 1.677 -12.564 TWS(4.8 m) -1.465 -19.436 TWS(4.6m) 0.010 -17.250 TWS(4.4m) 1.048 -17.279 TWS(4.2m) 1.872 -16.835 TWS(2.0m) 2.197 -13.831 TWS(1.8m) 2.606 -13.637 TWS(1.6m) 2.190 -13.491 TWS(1.4m) 1.679 -14.679 TWS(1.2m) 1.838 -14.122 TWS(1.0m) 1.937 -13.604 TWS(0.9 m) 2.616 -11.843 TWS(0.8 m) 2.069 -12.972 TWS(0.7 m) 1.697 -13.673 TWS(0.6 m) 1.779 -13.649 TWS(0.5 m) 1.879 -13.753 TWS(0.4 m) 2.026 -12.213 TWS(0.3 m) 2.327 -13.062 TWS(0.2 m) 1.841 -13.069 TWS(0.1 m) 2.125 -13.451 TWS(0.05 m) 2.246 -11.489 TWS(-0.05 m) 1.707 -14.833 TWS(-0.1m) 2.572 -8.907 TWS(-0.2m) 2.869 -10.305 TWS(-0.7m) 2.480 -14.065 TWS(-0.9m) 1.943 -14.371 TWS(-1.1m) 2.236 -15.273 TWS(-1.5m) 2.317 -14.955 TWS(-2.0m) 2.210 -13.206 TWS(-2.5m) 3.150 -13.351 
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