Carbon isotope variations and genetic analysis of the Doushantuo Formation of the Edia-caran system in Zhangcunping, Yichang
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摘要:
以宜昌樟村坪地区万家沟和白鹭垭2个陡山沱组剖面为研究对象，开展了黄陵背斜北缘浅水沉积区埃迪卡拉系陡山沱组C稳定同位素研究。建立了黄陵背斜北缘陡山沱组C稳定同位素曲线，并识别出4次负漂移（ZN1~ZN4），3次正漂移事件（ZP1~ZP3）。其中3次负漂移可以全球对比，1次负漂移（ZN3）在峡东地区可以显著识别。确认了ZN4与DOUNCE事件的对应关系，且该区缺失峡东典型剖面陡山沱组四段。认为ZN1是全球性甲烷渗漏事件的反映；ZN2是区域性海平面下降的反映，与全球WANCE事件有很好的对应关系，而对应年代值要远比Gaskeris冰期时间早；ZN3应当是区域性洋流上升带来贫13C沉积物引起的；ZN4则可以非常好地用埃迪卡拉纪海洋有机碳库氧化来解释。
Abstract:For the purpose of systematic analysis of the Ediacaran carbon stable isotope curve from the shallow marine facies Doushan-tuo Formation on the northern limbs of the Huangling anticline, the authors chose Zhangcunping and Bailuya sections in Yichang of Hubei Province as the study objects.The results indicate that four remarkable negative (ZN1~ZN4) and three positive carbon isotope anomalies (ZP1~ZP3) exist in the strata.As for negative excursions, the three negative carbon isotope excursions could be compared well with those from the other global typical sections; and the other one could be well recognized in eastern Yangtze Gorges.Further-more, it is held that ZN4 corresponds to DOUNCE event and the typical fourth member of Doushantuo Formation section has not been deposited in the area; ZN1 is a reflection of the global methane leakage incident; ZN2 was caused by regional lowered sea level, which was mich earlier than the Gaskeris glaciation and could be correlated with WANCE event; ZN3 resulted from the regional up-welling, which carried 13C depleted organic materials from deep ocean; ZN4 can be explained by the oxidation of organic carbon pool of the Ediacaran Ocean.
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Keywords:
- Ediacaran /
- carbon stable isotope /
- shallow marine facies /
- Zhangcunping
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致谢: 审稿老师指出不足并提出改进方向，中国地质调查局武汉地质调查中心阎春波博士与笔者进行了有益讨论，并提出了改进意见，武汉地质调查中心危凯博士在送审过程中提供了帮助，在此一并表示衷心的感谢。
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图 2 万家沟剖面（a）和白鹭垭剖面（b）δ13C值、δ18O值相关性
Figure 2. Cross plots of δ18O versus δ13C for Wanjiagou section (a) and Bailuya (b) section
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图 3 樟村坪万家沟剖面陡山沱组δ13CVPDB和δ18OVPDB曲线
a—陡山沱组二段中上部含磷质结核白云岩；b—陡山沱组二段中部暴露剥蚀面；c—陡山沱组二段下部磷矿层；d—陡山沱组一段、二段界线
Figure 3. δ13CVPDB and δ18OVPDB profiles of the Doushantuo Formation in the Wanjiagou section, Zhangcunping
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图 4 樟村坪白鹭垭剖面陡山沱组δ13CVPDB和δ18OVPDB曲线
A—陡山沱组/灯影组界线；B—陡山沱组二段上部白云岩和磷块岩透镜体；C—陡山沱组二段中部暴露剥蚀面
Figure 4. δ13CVPDB and δ18OVPDB profiles of the Doushantuo Formation in the Bailuya section, Zhangcunping
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图 5 湖北宜昌樟村坪地区陡山沱组C稳定同位素曲线划分及对比
Figure 5. The classification and correlation of carbon isotopic curves of the Ediacaran Doushantuo Formation in Zhangcunping, Yichang, western Hubei
表 1 樟村坪地区万家沟和白鹭垭剖面δ13C和δ18O数据分析结果
Table 1 δ18O and δ13C data of samples from the Wanjiagou section and Bailuya section in Zhangcunping area
样品 厚度/m δ13CVPDB/‰ δ18OVPDB/‰ 万家沟剖面 12YZWZ-51T 98.6 4.42 -1.55 12YZWZ-50T 96.47 4.51 -1.44 12YZWZ-49T 95.6 4.58 -0.97 12YZWZ-48T 94.5 3.88 -1.71 12YZWZ-47T 92.7 3.12 -2.57 12YZWZ-46T 82.62 4.49 -2.92 12YZWZ-45T 81.3 5.10 -3.56 12YZWZ-44T 79.85 4.83 -2.99 12YZWZ-43T 78.4 3.83 -3.65 12YZWZ-42T 76.95 2.47 -4.49 12YZWZ-41T 75.5 3.05 -3.60 12YZWZ-40T 74.05 4.81 -4.34 12YZWZ-39T 72.6 4.02 -5.05 12YZWZ-38T 71.15 4.31 -4.41 12YZWZ-37T 69.7 4.55 -3.99 12YZWZ-36T 68.25 4.56 -3.86 12YZWZ-35T 66.8 4.93 -5.03 12YZWZ-34T 65.35 3.55 -4.38 12YZWZ-33T 63.9 4.43 -5.99 12YZWZ-32T 62.45 5.99 -4.95 12YZWZ-31T 61 4.06 -5.65 12YZWZ-30T 59.55 4.55 -5.06 12YZWZ-29T 58.1 3.20 -4.97 12YZWZ-28T 56.65 4.02 -3.86 12YZWZ-27T 55.2 1.94 -2.84 12YZWZ-26T 55.05 1.30 -4.92 12YZWZ-25T 53.80 1.71 -4.34 12YZWZ-24T 52.30 2.59 -3.90 12YZWZ-23T 51.80 1.48 -4.05 12YZWZ-22T 51.32 1.61 -4.58 12YZWZ-21T 50.00 -0.87 -5.84 12YZWZ-20T 48.60 1.74 -5.89 12YZWZ-19T 47.10 1.69 -5.06 12YZWZ-18T 45.70 3.67 -6.31 12YZWZ-17T 44.30 2.86 -6.27 12YZWZ-16T 42.90 2.33 -5.91 12YZWZ-15T 41.50 2.63 -7.63 12YZWZ-14T 40.00 3.09 -7.11 12YZWZ-13T 38.60 3.90 -6.13 12YZWZ-12T 37.10 3.96 -4.73 12YZWZ-11T 35.70 4.15 -6.19 12YZWZ-10T 34.20 4.18 -5.76 12YZWZ-9T 32.80 3.49 -5.92 12YZWZ-8T 30.00 3.16 -5.96 12YZWZ-6T 3.20 -0.34 -6.04 12YZWZ-5T 2.80 -0.38 -5.01 12YZWZ-4T 2.40 -1.88 -9.36 12YZWZ-3T 2.00 -1.39 -5.77 12YZWZ-2T 1.40 -0.10 -3.77 12YZWZ-1T 0.90 -1.82 -4.88 白鹭垭剖面 12YZBZ-79T 107.10 3.42 -2.88 12YZBZ-78T 105.28 -3.00 -3.44 12YZBZ-77T 104.80 -2.22 -2.99 12YZBZ-76T 103.90 -2.32 -2.72 12YZBZ-75T 103.10 2.75 -4.95 12YZBZ-74T 102.50 -0.92 -3.56 12YZBZ-73T 102.08 0.17 -2.87 12YZBZ-72T 101.30 0.46 -3.42 12YZBZ-71T 100.10 2.12 -3.46 12YZBZ-70T 98.95 0.52 -2.76 12YZBZ-69T 87.70 4.66 -1.88 12YZBZ-68T 86.20 4.78 -2.10 12YZBZ-67T 84.20 4.93 -1.72 12YZBZ-66T 83.40 5.51 -2.15 12YZBZ-65T 82.85 5.56 -1.77 12YZBZ-64T 81.70 5.43 -2.52 12YZBZ-63T 80.40 5.54 -3.22 12YZBZ-62T 79.30 5.56 -3.71 12YZBZ-61T 78.10 5.80 -1.71 12YZBZ-60T 76.90 5.71 -2.68 12YZBZ-59T 75.80 5.79 -2.22 12YZBZ-58T 75..1 5.83 -1.57 12YZBZ-57T 73.80 5.56 -2.88 12YZBZ-56T 72.30 5.79 -1.89 12YZBZ-55T 71.00 5.56 -1.68 12YZBZ-54T 70.50 5.28 -1.67 12YZBZ-53T 68.90 5.31 -1.14 12YZBZ-52T 67.10 4.68 -2.17 12YZBZ-51T 65.40 4.58 -1.64 12YZBZ-50T 64.60 3.75 -1.93 12YZBZ-49T 63.50 3.41 -0.98 12YZBZ-48T 56.90 0.92 -1.73 12YZBZ-47T 54.20 -0.51 -2.64 12YZBZ-46T 52.00 -4.47 -3.18 12YZBZ-45T 50.50 3.57 -3.10 12YZBZ-44T 49.00 4.47 -2.87 12YZBZ-43T 48.45 4.75 -1.96 12YZBZ-42T 46.90 3.08 -3.69 12YZBZ-41T 45.55 3.68 -2.82 12YZBZ-40T 44.40 5.39 -2.74 12YZBZ-39T 43.25 4.01 -5.79 12YZBZ-38T 42.00 3.93 -3.50 12YZBZ-37T 40.90 2.70 -4.33 12YZBZ-36T 39.80 5.33 -4.39 12YZBZ-35T 38.60 2.79 -3.67 12YZBZ-34T 37.50 4.01 -4.70 12YZBZ-33T 36.35 4.27 -2.84 12YZBZ-32T 35.20 4.11 -3.75 12YZBZ-31T 34.10 4.19 -3.36 12YZBZ-30T 32.90 4.21 -4.71 12YZBZ-29T 31.70 2.30 -4.16 12YZBZ-28T 30.60 2.35 -4.07 12YZBZ-27T 29.45 3.64 -3.90 12YZBZ-26T 28.30 4.46 -3.28 12YZBZ-25T 27.15 4.48 -2.74 12YZBZ-24T 26.00 5.62 -4.05 12YZBZ-23T 24.85 3.35 -4.30 12YZBZ-22T 23.70 5.51 -2.50 12YZBZ-21T 22.50 4.23 -2.68 12YZBZ-20T 21.50 4.83 -3.91 12YZBZ-19T 20.40 6.59 -5.04 12YZBZ-18T 19.10 2.71 -6.11 12YZBZ-17T 17.95 3.71 -3.08 12YZBZ-16T 16.80 4.74 -3.26 12YZBZ-15T 15.65 3.54 -3.74 12YZBZ-14T 14.50 -0.81 -3.09 12YZBZ-13T 14.10 1.51 -4.06 12YZBZ-12T 12.80 0.60 -3.57 12YZBZ-11T 12.20 -1.44 -3.77 12YZBZ-10T 11.40 -1.46 -3.32 12YZBZ-9T 11.20 -3.93 -8.01 12YZBZ-8T 9.60 -7.96 -1.65 12YZBZ-7T 9.50 -0.53 -5.20 12YZBZ-6T 8.40 -3.36 -5.83 12YZBZ-5T 7.30 -1.12 -6.11 12YZBZ-4T 5.40 0.06 -6.01 12YZBZ-3T 3.50 -0.59 -5.92 12YZBZ-2T 3.20 -1.13 -5.93 12YZBZ-1T 2.00 1.00 -6.61 
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