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    川东华蓥二叠系-三叠系界线地层地质事件与元素地球化学响应

    周刚 郑荣才 罗平 郑超 蔡家兰 文华国

    周刚, 郑荣才, 罗平, 郑超, 蔡家兰, 文华国, 2012. 川东华蓥二叠系-三叠系界线地层地质事件与元素地球化学响应. 地球科学, 37(S1): 101-110. doi: 10.3799/dqkx.2012.S1.010
    引用本文: 周刚, 郑荣才, 罗平, 郑超, 蔡家兰, 文华国, 2012. 川东华蓥二叠系-三叠系界线地层地质事件与元素地球化学响应. 地球科学, 37(S1): 101-110. doi: 10.3799/dqkx.2012.S1.010
    ZHOU Gang, ZHENG Rong-cai, LUO Ping, ZHENG Chao, CAI Jia-lan, WEN Hua-guo, 2012. Geological Events and Their Geochemical Responses of the Permian-Triassic Boundary, Huaying, Eastern Sichuan. Earth Science, 37(S1): 101-110. doi: 10.3799/dqkx.2012.S1.010
    Citation: ZHOU Gang, ZHENG Rong-cai, LUO Ping, ZHENG Chao, CAI Jia-lan, WEN Hua-guo, 2012. Geological Events and Their Geochemical Responses of the Permian-Triassic Boundary, Huaying, Eastern Sichuan. Earth Science, 37(S1): 101-110. doi: 10.3799/dqkx.2012.S1.010

    川东华蓥二叠系-三叠系界线地层地质事件与元素地球化学响应

    doi: 10.3799/dqkx.2012.S1.010
    基金项目: 

    国家自然科学基金资助项目 40872082

    详细信息
      作者简介:

      周刚(1984-), 男, 博士研究生, 沉积学专业, E-mail: zhougang29@126.com

      通讯作者:

      郑荣才, E-mail: zhengrc@cdut.edu.cn

    • 中图分类号: P534.46;P534.51;P588.22

    Geological Events and Their Geochemical Responses of the Permian-Triassic Boundary, Huaying, Eastern Sichuan

    • 摘要: 以华蓥山涧水沟PTB界线地层剖面为例, 对地层学界长期争论但始终没有得到解决的全球性地质难题PTB界线进行了地质、地球化学等方面的探讨, 可从该剖面中识别出生物地层和岩性地层两类T/P界线, 两者相距约4.56 m, 所有的海平面下降、生物绝灭、火山喷发和古海洋由正常海向非正常的高Sr海转化等复杂地质事件, 都发生在两类T/P界线之间.Fe、Mn、Sr微量元素和C、O稳定同位素的规律性变化和相关控制因素也都出现在两类T/P界线之间, 证明元素地球化学特征对PTB界线地层中所出现的各种复杂地质事件都具有良好的响应.

       

    • 图  1  剖面位置

      1.公路;2.行政区域界线;3.市县;4.镇;5.剖面位置

      Fig.  1.  Location of the section

      图  2  川东华蓥涧水沟剖面二叠系-三叠系界线地层综合柱状图

      Fig.  2.  Comprehensive column of Permian-Triassic boundary in Jianshuigou section, Huaying, eastern Sichuan

      图  3  涧水沟二叠系-三叠系界线地层岩石薄片显微照片

      显微照相都为单片光;a.层2,碎裂状泥晶生物碎屑海绵灰岩(-);b.层3上部,泥晶棘屑含云灰岩,含绿藻、瓣鳃、腕足、有孔虫,绿藻、有孔虫选择性白云石化;c.层4下部,泥晶白云岩,结构不均匀,保存有菌藻丝体,反映有微生物作用;d.层4上部,泥粉晶白云岩,含腹足化石;e.层8,黄铁矿质泥晶海百合灰岩,生屑间充填的黄铁矿含量8%;f.层9渗滤豆

      Fig.  3.  Microphotographs of thin sections for the P-T boundary section at Jianshuigou, Sichuan

      图  4  涧水沟二叠系-三叠系界线地层内古暴露面特征

      a.露头照片,层4和5之间的古暴露面;b.发育在层9内的渗滤豆照片;c.左边照片方框的近拍,其中m为渗滤豆,n为灰绿色泥晶基质,可见渗滤豆由基质为灰绿色的泥晶包覆

      Fig.  4.  Ancient expose face feature of the P-T boundary section at Jianshuigou, Sichuan

      图  5  涧水沟二叠系-三叠系界线地层内牙形石化石

      a, b.Clarkina changxingensis长兴克拉克牙形石,Y2;c.Hindeodus parvus小欣德齿牙形石,Y3

      Fig.  5.  Conodont fossil of the P-T boundary section at Jianshuigou, Sichuan

      图  6  涧水沟剖面与煤山剖面δ13CPDB对比

      Fig.  6.  Correlation of δ13CPDB between the Jianshuigou and Meishan section

      表  1  样品的采样位置、Mn、Fe、Sr含量和δ13C,δ18O值

      Table  1.   Sampling location, Mn、Fe、Sr content and δ13C, δ18O for the samples

      样号 采样位置 微量元素含量(%) δ13CPDB(‰) δ18OPDB(‰)
      Mn Fe Sr
      Ht6 12层中部 0.0580 2.440 0.150 -0.14±0.009 -6.20±0.030
      Ht5 11层中部 0.0660 1.620 0.140 -0.18±0.036 -6.31±0.012
      Ht4 10层底部 0.0540 3.280 0.120 -0.08±0.055 -6.06±0.023
      Ht3 9层中部 0.0520 1.800 0.140 0.13±0.060 -6.28±0.043
      Ht2 8层中部 0.0190 1.240 0.110 0.76±0.053 -6.43±0.028
      Hp3 4层距顶0.4m处 0.0260 0.440 0.050 2.58±0.011 -6.05±0.028
      Hp2 3层距顶0.2m处 0.0027 0.023 0.080 3.78±0.018 -5.27±0.017
      Hp1 2层底部 0.0092 0.038 0.041 3.76±0.034 -4.60±0.034
      注:C、O同位素由西南大学地理科学学院地球化学与同位素实验室分析完成,仪器为Delta Ⅴ Plus+Kiel Ⅳ Carbonate Device, δ13C分析误差为0.006~0.042, δ18O分析误差为0.009~0.043;Fe,Mn,Sr含量由中国地质科学院矿产综合利用研究所分析测试中心分析,测试仪器为2000DV,检测依据为JY/T015-1996《感耦等离子体原子发射光谱方法通则》,分析结果以单元素含量表示,检测限0.001%,误差0.002%.
      下载: 导出CSV
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