Carbon isotopic composition of the Ediacaran Doushantuo Formation from ZK04 drill hole in Changyang of west Hubei Province and its significance for stratigraphic correlation
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摘要:
对湖北长阳两河口ZK04钻孔岩心进行了详细的碳酸盐岩C、O同位素分析，识别了埃迪卡拉系陡山沱组4次明显的δ13C负偏离，分别位于陡山沱组一段、二段中上部、二段上部和三段上部至四段。其中第1、2和4次δ13C负偏离与黄陵背斜周缘的剖面能够很好地对应，具有重要的区域和全球地层对比意义。在第1次δ13C正偏离区域内并未发现明显的δ13C负偏，分析认为WANCE事件可能仅代表了峡东部分地区一次短暂的δ13C降低事件。第3次δ13C负偏离表现最显著，然而在秭归泗溪和青林口以外的其他地区未见报道，可能是由于水体较浅的区域发生了地层缺失，未能保存此次δ13C负偏离。长阳ZK04孔陡山沱组顶部的第4次δ13C负偏离表现较弱，考虑到陡山沱组四段的黑色页岩较少发育，推测长阳两河口地区在陡山沱晚期处于浅水台地或台地边缘。DOUNCE可能是地史时期最大的一次全球性C同位素负偏离事件，其与大型具刺疑源类化石群和埃迪卡拉生物群的发展演化有紧密的联系，对于全球埃迪卡拉纪统级地层对比具有重要的意义。
Abstract:The authors analyzed carbon and oxygen isotopes of Ediacaran Doushantuo Formation from ZK04 drilling core, Lianghek-ou of Changyang, Hubei Province.The carbon isotope trends show 4 negative excursions which exist in Member 1, the medium-up-per part of Member 2, the upper part of Member 2 and the Upper Member 3 to Member 4 of Doushantuo Formation, respectively.The first, second and the fouth negative δ13C excursions can be well correlated to those from other sections of the Yangtze Gorges, and are of great significance for the regional and global Ediacaran stratigraphic correlation.Since the notable negative excursion in the first positive δ13C excursion is not observed in the ZK04 drilling core, the authors hold that the WANCE event could merely repre-sent a short-term δ13C decrease in partial area of Yangtze Gorges.The third, which was the strongest negative δ13C excursion, has not been reported in other regions, except for Sixi and Qinglinkou of Zigui County.A probable explanation is that there occurred stratigraphic gap in the relatively shallow water.The relatively weak negative δ13C excursion at the top of Doushantuo Formation, as-sociated with the less developed black shales, suggests that the Lianghekou area of Changyang might have been located at the shallowwater platform or platform margin during the late Doushantuo period.DOUNCE was probably the most negative event of δ13C in the geological time, and it is believed to have been closely linked to the evolution of the large acanthomorphic acritarchs and the Edia-caran biota, accordingly it may be of great importance for global Eidacaran stratigraphic subdivision.
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Keywords:
- Doushantuo Formation /
- carbon-oxygen isotope /
- drilling core /
- Changyang
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致谢: 审稿专家和中国地质调查局武汉地质调查中心陈孝红研究员对论文提出了宝贵的修改意见，武汉地质调查中心同位素地球化学实验室于桂香老师和蔡应雄工程师帮助完成了C、O同位素分析，在此一并致以诚挚的谢意。
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图 1 湖北长阳ZK04钻孔的地理位置和地质图
Figure 1. Geographic location and geological map of ZK04 drill hole in Changyang, Hubei Province
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图 2 湖北长阳两河口ZK04钻孔埃迪卡拉系δ13C和δ18O值相关性
Figure 2. Correlation analysis between δ13C and δ18O of the Lianghekou ZK04 core in Changyang, Hubei Province
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图 3 湖北长阳ZK04钻孔埃迪卡拉系δ13C和δ18O变化特征
Figure 3. δ13C and δ18O variation of Ediacaran section from ZK04 drilling core, Changyang, Hubei Province
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图 4 峡东地区不同埃迪卡拉纪剖面C同位素组成特征对比
Figure 4. Stable carbon isotope correlation of Ediacaran sections in Yangtze Gorges area
表 1 湖北长阳ZK04钻孔C、O稳定同位素和Mn/Sr值测试结果
Table 1 Stable carbon and oxygen isotopic data and Mn/Sr ratios of the ZK04 drilling core in Changyang, Hubei Province
序号 样品号 深度/m 岩性 δ13CPDB/‰ δ18OPDB/‰ Mn/Sr 1 ZK04-1T 9.5 白云岩 3.42 -3.03 2 ZK04-2T 18.3 白云岩 1.11 -3.90 3 ZK04-3T 20.8 白云岩 1.94 -4.33 4 ZK04-3-2T 23.9 白云岩 1.41 -4.82 5 ZK04-3-2T* 白云岩 1.38 -4.82 6 ZK04-4T 25.9 白云岩 0.60 -4.77 7 ZK04-5T 27.3 白云岩 -2.52 -3.44 8 ZK04-6T 28.9 白云岩 0.67 -2.92 9 ZK04-8T 33.0 白云岩 -0.45 -3.62 10 ZK04-8T* 白云岩 -0.48 -3.62 11 ZK04-10T 38.5 白云岩 1.36 -2.86 12 ZK04-11T 40.2 白云岩 -0.10 -2.63 13 ZK04-12T 41.7 白云岩 -0.15 -2.53 0.30 14 ZK04-13T 45.3 白云岩 1.10 -3.66 15 ZK04-13T* 白云岩 1.11 -3.75 16 ZK04-14T 47.7 灰岩 -0.14 -8.18 0.76 17 ZK04-15T 50.5 灰岩 0.62 -7.97 18 ZK04-15T* 灰岩 0.63 -7.95 19 ZK04-16T 52.1 灰岩 6.27 -8.73 20 ZK04-17T 54.1 灰岩 3.10 -8.29 21 ZK04-18T 56.4 灰岩 3.76 -7.71 22 ZK04-19T 58.7 灰岩 2.20 -8.16 0.34 23 ZK04-19T* 灰岩 2.21 -8.03 24 ZK04-20T 60.3 灰岩 1.09 -8.41 25 ZK04-21T 64.2 灰岩 3.91 -7.26 26 ZK04-22T 66.0 灰岩 5.12 -5.74 27 ZK04-22T* 灰岩 5.11 -5.73 28 ZK04-23T 67.3 灰岩 4.11 -7.96 29 ZK04-24T 68.8 灰岩 5.41 -7.60 30 ZK04-25T 71.6 灰岩 5.35 -8.24 0.43 31 ZK04-26T 74.1 灰岩 4.23 -7.08 32 ZK04-26T* 灰岩 4.21 -7.20 33 ZK04-27T 75.6 灰岩 4.57 -7.87 34 ZK04-28T 77.6 灰岩 2.99 -7.91 35 ZK04-29T 79.5 灰岩 2.61 -8.43 36 ZK04-29T* 灰岩 2.62 -8.37 37 ZK04-30T 81.3 灰岩 4.02 -4.72 38 ZK04-31T 86.3 白云岩 3.17 -2.07 0.64 39 ZK04-32T 89.0 白云岩 2.94 -2.32 40 ZK04-33T 90.2 白云岩 -0.44 -2.56 41 ZK04-34T 96.0 白云岩 -3.00 -2.32 42 ZK04-34T* 白云岩 -2.99 -2.28 43 ZK04-35T 101.2 白云岩 0.30 -3.07 44 ZK04-36T 106.1 白云岩 -1.03 -2.07 45 ZK04-37T 127.6 白云岩 5.26 -4.70 46 ZK04-38T 133.4 白云岩 3.93 -4.51 47 ZK04-38T* 白云岩 3.93 -4.53 48 ZK04-39T 139.6 灰岩 3.60 -6.64 0.30 49 ZK04-40T 142.9 灰岩 3.48 -8.00 50 ZK04-41T 143.8 灰岩 2.59 -8.00 51 ZK04-41T* 灰岩 2.65 -7.96 52 ZK04-42T 150.3 白云岩 3.99 -3.43 53 ZK04-43T 153.8 白云岩 3.72 -3.30 54 ZK04-44T 155.4 白云岩 5.62 -3.03 0.31 55 ZK04-45T 161.4 白云岩 6.93 -3.26 56 ZK04-45T* 白云岩 6.93 -3.32 57 ZK04-46T 164.9 灰岩 6.69 -7.80 58 ZK04-47T 166.8 灰岩 6.25 -7.60 59 ZK04-48T 170.5 灰岩 6.74 -9.05 60 ZK04-48T* 灰岩 6.80 -8.95 61 ZK04-49T 172.2 灰岩 6.36 -7.10 0.56 62 ZK04-50T 175.9 灰岩 6.69 -8.02 63 ZK04-51T 176.8 灰岩 6.60 -7.03 64 ZK04-52T 180.0 灰岩 6.47 -6.78 65 ZK04-52T* 灰岩 6.45 -6.66 66 ZK04-53T 181.8 灰岩 7.06 -6.10 67 ZK04-54T 182.9 灰岩 6.79 -6.90 68 ZK04-55T 185.3 灰岩 6.71 -8.55 0.35 69 ZK04-56T 187.7 灰岩 6.81 -8.76 70 ZK04-57T 190.6 灰岩 6.66 -5.25 71 ZK04-58T 194.3 灰岩 6.58 -4.78 72 ZK04-59T 200.4 白云岩 6.37 -4.68 73 ZK04-60T 204.5 白云岩 6.75 -4.70 74 ZK04-61T 208.1 灰岩 6.72 -9.74 75 ZK04-62T 210.6 灰岩 6.80 -11.12 76 ZK04-62T* 灰岩 6.83 -11.09 77 ZK04-63T 213.0 灰岩 6.76 -9.15 78 ZK04-64T 214.3 灰岩 7.51 -9.36 0.24 79 ZK04-65T 217.4 灰岩 7.21 -8.83 80 ZK04-66T 221.5 灰岩 7.37 -7.44 81 ZK04-67T 223.3 灰岩 6.78 -9.35 82 ZK04-68T 226.9 灰岩 7.52 -10.85 83 ZK04-69T 229.9 灰岩 8.06 -8.86 84 ZK04-70T 232.4 灰岩 8.03 -9.69 85 ZK04-70T* 灰岩 8.05 -9.66 86 ZK04-71T 236.7 灰岩 7.59 -10.14 87 ZK04-72T 238.8 灰岩 7.45 -10.08 0.29 88 ZK04-73T 243.5 灰岩 7.89 -7.35 89 ZK04-74T 244.8 灰岩 7.66 -8.53 90 ZK04-75T 249.5 灰岩 7.25 -8.16 91 ZK04-76T 252.8 灰岩 7.73 -8.98 92 ZK04-77T 255.0 灰岩 7.42 -11.22 93 ZK04-78T 256.5 灰岩 7.31 -11.55 0.16 94 ZK04-78T* 灰岩 7.33 -11.53 95 ZK04-79T 262.6 灰岩 7.08 -11.55 96 ZK04-80T 267.8 灰岩 6.46 -5.55 97 ZK04-81T 270.4 白云岩 6.00 -6.73 98 ZK04-82T 274.3 白云岩 5.40 -5.27 99 ZK04-82T* 白云岩 5.39 -5.35 0.38 100 ZK04-83T 281.8 灰岩 0.92 -9.30 101 ZK04-84T 283.5 白云岩 0.91 -3.99 1.64 102 ZK04-85T 284.7 白云岩 0.07 -4.41 103 ZK04-86T 285.7 白云岩 1.06 -4.05 104 ZK04-87T 286.9 白云岩 1.29 -3.92 105 ZK04-87T* 白云岩 1.33 -3.88 106 ZK04-88T 287.2 白云岩 2.61 -2.24 2.78 107 ZK04-89T 288.0 白云岩 1.67 -5.81 108 ZK04-89T* 白云岩 1.68 -5.81 109 ZK04-90T 288.3 白云岩 1.56 -2.29 110 ZK04-91T 289.0 白云岩 1.78 -1.73 111 ZK04-92T 289.8 白云岩 2.95 -1.63 112 ZK04-93T 290.5 白云岩 3.02 -2.67 113 ZK04-94T 291.0 白云岩 -2.67 -8.85 114 ZK04-95T 291.6 白云岩 -1.95 -9.03 注：*为重复测试样 
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