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    湖南嘉禾大窝岭剖面吴家坪阶-长兴阶界线牙形石生物地层及一次碳同位素负偏

    叶茜 江海水

    叶茜, 江海水, 2016. 湖南嘉禾大窝岭剖面吴家坪阶-长兴阶界线牙形石生物地层及一次碳同位素负偏. 地球科学, 41(11): 1883-1892. doi: 10.3799/dqkx.2016.130
    引用本文: 叶茜, 江海水, 2016. 湖南嘉禾大窝岭剖面吴家坪阶-长兴阶界线牙形石生物地层及一次碳同位素负偏. 地球科学, 41(11): 1883-1892. doi: 10.3799/dqkx.2016.130
    Ye Qian, Jiang Haishui, 2016. Conodont Biostratigraphy and a Negative Excursion in Carbonate Carbon Isotopes across the Wuchiapingian-Changhsingian Boundary at the Dawoling Section, Hunan Province. Earth Science, 41(11): 1883-1892. doi: 10.3799/dqkx.2016.130
    Citation: Ye Qian, Jiang Haishui, 2016. Conodont Biostratigraphy and a Negative Excursion in Carbonate Carbon Isotopes across the Wuchiapingian-Changhsingian Boundary at the Dawoling Section, Hunan Province. Earth Science, 41(11): 1883-1892. doi: 10.3799/dqkx.2016.130

    湖南嘉禾大窝岭剖面吴家坪阶-长兴阶界线牙形石生物地层及一次碳同位素负偏

    doi: 10.3799/dqkx.2016.130
    基金项目: 

    国家自然科学基金项目 41572324

    国家自然科学基金项目 41272044

    详细信息
      作者简介:

      叶茜(1993-),女,硕士研究生,地质学专业地层古生物方向.E-mail: 18064125680@163.com

      通讯作者:

      江海水, E-mail: jiangliuis@163.com

    • 中图分类号: P53

    Conodont Biostratigraphy and a Negative Excursion in Carbonate Carbon Isotopes across the Wuchiapingian-Changhsingian Boundary at the Dawoling Section, Hunan Province

    • 摘要: 吴家坪阶-长兴阶界线位于这两次生物大灭绝事件之间,科学界对该界线附近是否发生重大地质事件仍然知之甚少,有关该时期的环境变化、碳循环的研究也不深入.嘉禾大窝岭剖面牙形石生物地层以及碳同位素变化的研究,为进一步探讨吴家坪期-长兴期附近的生物及环境事件提供基础材料.晚二叠世时以深水盆地相沉积为主的大窝岭剖面位于湖南省嘉禾县袁家镇附近.该剖面大隆组出露较好,岩性主要为硅质岩、硅质灰岩、灰岩以及泥岩.在大隆组中共识别出牙形石1属3种(含一个未定种):Clarkina wangiC. deflectaC. sp.,并识别出牙形石C. wangi带和C. changxingensis-C. deflecta组合带.根据C. wangi的首现,将大窝岭剖面的吴家坪阶-长兴阶界线(Wuchiapingian-Changhsingian boundary,简称WCB)置于第11层底部.该剖面全岩无机碳同位素数据显示在13~15层发生了一次快速的负偏,从2.18‰负偏到-1.39‰,负偏值近3.50‰,可与浙江煤山及四川上寺等剖面进行很好的对比,揭示这次碳同位素负偏在华南区域上可具对比性.

       

    • 图  1  湖南嘉禾大窝岭剖面交通位置

      Fig.  1.  The location of the Dawoling section, Jiahe county, Hunan Province

      图  2  湖南嘉禾大窝岭剖面区域地质

      Fig.  2.  Regional geology of the Dawoling section, Jiahe county, Hunan Province

      图  3  大窝岭剖面产出的牙形石

      1~8, 10~11.Clarkina wangi(Zhang);1.HDC14_001,HDC-14;2.HDC14_002,HDC-14;3.HDC14_004,HDC-14;4.HDC14_009,HDC-14;5.HDC19_002,HDC-19;6.HDC22_003,HDC-22;7.HDC22_004,HDC-22;8.HDC22_006,HDC-22;9.Clarkina deflecta(Wang & Wang);HDC22_010,HDC-22.12~13.Clarkina sp.;10.HDC22_013,HDC-22;11.HDC22_024,HDC-22;12.HDC27_012,HDC-27;13.HDC28-9_010,HDC-28.牙形石均为P1分子,口视

      Fig.  3.  Conodonts from the Dawoling section

      图  4  大窝岭剖面产出的菊石与双壳化石

      1.Hunanopeten sp.,HDC-13;2~4.Xenaspis carbonaricus,HDC-13;5~6.Xenaspis sp.,HDC-13;7.Pseudotirolites? sp.,HDC-13;8.Sinoceltites sp.,HDC-3.除8比例尺为2.5 cm,其余均为5 mm

      Fig.  4.  Ammonoids and bivalve from the Dawoling section

      图  5  湖南嘉禾大窝岭剖面δ13C-δ18O散点分布

      Fig.  5.  Crossplots showing the relationship between δ13C and δ18O from the Dawoling section, Jiahe county, Hunan Province

      图  7  华南大窝岭剖面和煤山剖面吴家坪阶-长兴阶界线牙形石分布以及无机碳同位素变化对比

      a.湖南大窝岭剖面;b.浙江煤山剖面,引自Shen et al.(2013),阴影部分表示两剖面C. wangi首现面之上碳同位素负偏的对比,虚线表示吴家坪阶-长兴阶界线

      Fig.  7.  Conodont distribution and carbonate carbon isotope values across the Wuchiapingian-Changhsingian boundary at the Dawoling and Meishan sections, South China

      图  6  吴家坪阶-长兴阶界线牙形石带对比

      Fig.  6.  Correlation of conodont zonations across the Wuchiapingian-Changhsingian boundary

      表  1  剖面描述

      Table  1.   Description of profiles

      层号 描述
      上部覆盖
      28 灰褐色-灰黑色灰岩与泥岩互层,可识别出15个旋回,每个旋回底部为灰岩,顶部为泥岩,产牙形石C. sp.,厚435 cm
      27 灰褐色硅质泥岩(距顶部40cm处有8cm厚的灰岩),产牙形石C. sp.,厚220 cm
      26 灰黑色薄层灰岩夹泥岩(顶底为灰岩,中间夹两层泥岩),厚80 cm
      25 黄褐色薄层泥岩,厚30 cm
      24 灰褐色-灰黑色硅质泥岩与灰黑色薄层灰岩互层,厚320 cm
      23 灰黑色硅质岩(顶部有硅质灰岩),厚40 cm
      22 灰黑色灰岩,产牙形石C. sp.,C. wangiC. deflecta(图 3),厚9 cm
      21 灰黑色硅质岩,厚11 cm
      20 灰白色粘土岩,厚6 cm
      19 灰黑色硅质岩夹硅质灰岩,产牙形石C. sp.,C. wangi,厚21 cm
      18 黄褐色泥岩,厚5 cm
      17 灰黑色硅质岩夹硅质灰岩,厚14 cm
      16 黄褐色泥岩,厚6 cm
      15 灰黑色硅质岩,厚8 cm
      14 灰黑色灰岩,产牙形石C. sp., C. wangi,厚8 cm
      13 灰黑色硅质岩夹硅质灰岩,产牙形石C. wangi,双壳Hunanopeten sp.和菊石Xenaspis carbonaricusXenaspis sp.,Pseudotirolites sp.(图 4),厚20 cm
      12 灰白色粘土岩,厚7 cm
      11 灰黑色硅质岩夹硅质灰岩,含牙形石C. sp.,C. wangi,厚60 cm
      10 灰黑色灰岩,厚15 cm
      9 灰黑色硅质岩夹硅质灰岩,厚19 cm
      8 灰白色粘土岩,厚5 cm
      7 灰黑色硅质岩夹硅质灰岩,厚24 cm
      6 灰黄色-黄色泥岩,厚3 cm
      5 灰黑色硅质岩夹硅质灰岩,厚44 cm
      4 黄褐色泥岩,厚33 cm
      3 灰黑色硅质岩夹硅质灰岩,产菊石Sinoceltites sp.(图 4),厚34 cm
      2 灰褐色泥岩,厚10 cm
      1 灰黑色硅质岩,厚11 cm
      下部覆盖
      下载: 导出CSV

      表  2  湖南嘉禾大窝岭剖面无机碳同位素(δ13Ccarb)以及氧同位素(δ18O)分析结果

      Table  2.   The δ13Ccarb and δ18O value of samples from the Daowoling section, Jiahe county, Hunan Province

      样品编号 δ13Ccarb(‰) δ18O(‰)
      DWL-01 1.92 -7.97
      DWL-02 1.46 -8.11
      DWL-03 1.55 -7.86
      DWL-04 1.29 -7.88
      DWL-05 0.24 -8.94
      DWL-06 1.75 -8.06
      DWL-07 1.48 -7.99
      DWL-08 1.45 -7.96
      DWL-09 0.23 -7.04
      DWL-10 1.26 -7.57
      DWL-11 0.71 -7.03
      DWL-12 0.55 -6.03
      DWL-13 0.71 -5.24
      DWL-14 2.30 -7.62
      DWL-15 1.66 -6.34
      DWL-16 2.18 -7.86
      DWL-17 0.40 -4.35
      DWL-18 0.32 -5.26
      DWL-19 0.47 -6.31
      DWL-20 -1.39 -5.73
      DWL-21 1.02 -6.77
      DWL-22 -0.38 -6.86
      DWL-23 2.02 -6.26
      DWL-24 2.30 -8.01
      DWL-25 1.28 -7.04
      DWL-26 0.93 -8.03
      DWL-27 2.35 -7.98
      DWL-28 2.04 -7.07
      DWL-29 2.11 -7.37
      DWL-30 2.14 -7.74
      DWL-31 2.50 -7.90
      DWL-32 2.08 -6.99
      DWL-33 2.42 -6.74
      DWL-34 1.93 -7.20
      DWL-35 2.01 -7.57
      DWL-36 2.67 -6.16
      DWL-37 2.49 -6.56
      DWL-38 2.26 -5.75
      DWL-39 1.59 -6.09
      DWL-40 2.26 -6.76
      DWL-41 2.59 -5.72
      DWL-42 2.20 -6.15
      DWL-43 2.62 -5.99
      DWL-44 2.41 -5.15
      DWL-45 2.73 -5.63
      DWL-46 2.79 -5.92
      DWL-47 2.31 -5.97
      DWL-48 2.85 -5.35
      DWL-49 2.53 -5.66
      下载: 导出CSV
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    • 收稿日期:  2016-03-02
    • 刊出日期:  2016-11-15

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