Lower Ordovician carbon isotope excursion in the eastern Yangtze Gorges area and its genetic analysis
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摘要:
以宜昌黄花场奥陶系剖面为研究对象，开展峡东地区早奥陶世C同位素研究，建立了峡东地区早奥陶世C同位素曲线，并识别出可全球对比的2次正漂移（C1，C3）和2次负漂移（C2，C4）。通过分析峡东地区沉积相序列及海平面变化特征，发现峡东地区C同位素变化曲线与海平面波动曲线一致，表明峡东地区C同位素的变化主要受控于海平面的波动。
Abstract:The carbon stable isotope curve was constructed in this paper from the Huanghuachang sections of Lower Ordovician in the eastern Yangtze Gorges area.δ13C data demonstrate that there existed two δ13C positive excursions (C1, C3) and two negative excursions (C2, C4), all of which are comparable in the global scale.Based on the sedimentary sequence characteristics of Lower Or-dovician in the eastern Yangtze Gorges area, the authors observed that the curve of δ13C is coincident with the curve of the regional sea-level fluctuations.This study indicates that the geochemistry as well as the sequences was well controlled by the sea level changes.
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图 1 峡东地区地质略图与剖面位置
Pre-Nh—前南华系；Nh-Z—南华系-震旦系；∈—寒武系；O—奥陶系；S—志留系；D-J—泥盆系-侏罗系；K—白垩系
Figure 1. Generalized geological map of eastern Yangtze Gorges area
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图 2 峡东地区早奥陶世C-O稳定同位素分布特征
Figure 2. Distribution of δ13C and δ18O in the Lower Ordovician strata in the east of Yangtze Gorges area
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图 3 峡东地区早奥陶世δ13C变化及其对海平面变化的响应
（C1~C4—代表 4次δ13C源移，大湾组下部数据据参考文献[11]）
Figure 3. δ13C variations and responses to the sea-leval changes during the Lower Ordovician in the east of Yangtze Gorges area
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图 4 峡东地区、北美地区、南美地区C同位素曲线对比
Figure 4. Correlation of δ13C chemostratigraphy of the east of Yangtze Gorges area with North America and South America
表 1 峡东地区早奥陶世C-O同位素测试结果
Table 1 δ13C and δ18O data of samples from the Lower Ordovician strata in the east of Yangtze Gorges area
样品号 层位 δ13C/‰ δ18O/‰ YYHH-77T 红花园组 -0.28 -7.14 YYHH-76T 红花园组 -0.52 -6.71 YYHH-75T 红花园组 -0.89 -7.97 YYHH-74T 红花园组 -1.62 -7.8 YYHH-73T 红花园组 -1.16 -7.97 YYHH-72T 红花园组 -1.28 -7.93 YYHH-71T 红花园组 -1.51 -7.56 YYHH-70T 红花园组 -1.29 -7.8 YYHH-69T 分乡组 -1.2 -7.86 YYHH-68T 分乡组 -1.29 -8.02 YYHH-67T 分乡组 -1.79 -7.74 YYHH-66T 分乡组 -1.5 -8.06 YYHH-65T 分乡组 -1.33 -8.14 YYHH-64T 分乡组 -1.85 -8.46 YYHH-63T 分乡组 -1.83 -7.55 YYHH-62T 分乡组 -2.4 -7.96 YYHH-61T 分乡组 -1.66 -8.18 YYHH-60T 分乡组 -2.37 -7.67 YYHH-59T 分乡组 -2.5 -7.6 YYHH-58T 分乡组 -2.39 -7.34 YYHH-57T 分乡组 -2.29 -7.07 YYHH-56T 分乡组 -2.62 -7.26 YYHH-55T 分乡组 -3.3 -7.64 YYHH-54T 分乡组 -3.24 -8.01 YYHH-53T 分乡组 -2.49 -7.52 YYHH-52T 分乡组 -2.64 -7.45 YYHH-51T 分乡组 -3.11 -7.82 YYHH-50T 分乡组 -2.8 -7.24 YYHH-49T 分乡组 -2.76 -7.8 YYHH-48T 分乡组 -1.6 -7.28 YYHH-47T 分乡组 -0.65 -7.45 YYHH-46T 分乡组 -0.26 -7.56 YYHH-45T 分乡组 -0.56 -7.39 YYHH-44T 分乡组 -0.86 -7.37 YYHH-43T 分乡组 -1.26 -7.64 YYHH-42T 分乡组 -0.38 -5.44 YYHH-41T 分乡组 -0.42 -5.45 YYHH-40T 分乡组 -1.66 -7.52 YYHH-39T 分乡组 -2.29 -7.69 YYHH-38T 南津关组 -5.33 -7.78 YYHH-37T 南津关组 -2.67 -7.57 YYHH-36T 南津关组 -2.53 -7.45 YYHH-35T 南津关组 -2.37 -8.1 YYHH-34T 南津关组 -1.9 -8.23 YYHH-33T 南津关组 -1.76 -7.95 YYHH-32T 南津关组 -1.68 -7.83 YYHH-31T 南津关组 -1.72 -7.84 YYHH-30T 南津关组 -2.94 -8.12 YYHH-29T 南津关组 -1.99 -5.77 YYHH-28T 南津关组 -1.17 -6.74 YYHH-27T 南津关组 -0.99 -6.16 YYHH-26T 南津关组 -0.99 -7.08 YYHH-25T 南津关组 -0.87 -5.97 YYHH-24T 南津关组 -1.03 -6.05 YYHH-23T 南津关组 -1.06 -7.75 YYHH-22T 南津关组 -0.8 -7.64 YYHH-21T 南津关组 -0.8 -7.61 YYHH-20T 南津关组 0.13 -7.21 YYHH-19T 南津关组 -0.2 -8.01 YYHH-18T 南津关组 -0.92 -7.54 YYHH-17T 南津关组 -0.69 -5.63 YYHH-16T 西陵峡组 -0.51 -7.33 YYHH-15T 西陵峡组 -0.2 -5.98 YYHH-14T 西陵峡组 -0.82 -5.66 YYHH-13T 西陵峡组 -0.83 -5.67 YYHH-12T 西陵峡组 -0.76 -6.01 YYHH-11T 雾渡河组 -1 -5.81 YYHH-10T 雾渡河组 -0.87 -6.1 YYHH-9T 雾渡河组 -1.06 -6.55 YYHH-8T 雾渡河组 -1.3 -7.04 YYHH-7T 雾渡河组 -0.87 -7.05 YYHH-6T 雾渡河组 -1.16 -7.78 YYHH-5T 雾渡河组 -0.59 -6.85 YYHH-4T 雾渡河组 -1.04 -7.08 YYHH-3T 雾渡河组 -0.83 -5.93 YYHH-2T 雾渡河组 -1.16 -7.39 YYHH-1T 雾渡河组 -0.87 -7.8 
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