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    中上扬子地区奥陶纪-志留纪之交火山作用对有机质富集的影响

    卢贤志 沈俊 郭伟 冯庆来

    卢贤志, 沈俊, 郭伟, 冯庆来, 2021. 中上扬子地区奥陶纪-志留纪之交火山作用对有机质富集的影响. 地球科学, 46(7): 2329-2340. doi: 10.3799/dqkx.2020.258
    引用本文: 卢贤志, 沈俊, 郭伟, 冯庆来, 2021. 中上扬子地区奥陶纪-志留纪之交火山作用对有机质富集的影响. 地球科学, 46(7): 2329-2340. doi: 10.3799/dqkx.2020.258
    Lu Xianzhi, Shen Jun, Guo Wei, Feng Qinglai, 2021. Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze. Earth Science, 46(7): 2329-2340. doi: 10.3799/dqkx.2020.258
    Citation: Lu Xianzhi, Shen Jun, Guo Wei, Feng Qinglai, 2021. Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze. Earth Science, 46(7): 2329-2340. doi: 10.3799/dqkx.2020.258

    中上扬子地区奥陶纪-志留纪之交火山作用对有机质富集的影响

    doi: 10.3799/dqkx.2020.258
    基金项目: 

    国家科技重大专项项目 2017ZX05036-002

    国家科技重大专项项目 2016ZX05060-004

    详细信息
      作者简介:

      卢贤志(1997-), 男, 硕士研究生, 从事地层学、古生物学及烃源岩的研究.ORCID: 0000-0002-5792-8817.E-mail: xz.lu@cug.edu.cn

      通讯作者:

      沈俊, E-mail: shenjun@cug.edu.cn

    • 中图分类号: P535

    Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze

    • 摘要: 为了研究火山作用对黑色泥岩有机质富集机制的影响,以重庆市武隆区焦页143-5井岩心为研究对象,借助汞元素含量、总硫、总有机碳和钡元素含量等手段,分析上扬子地区奥陶系与志留系之交(五峰组-龙马溪组)火山活动和有机质富集的耦合关系.结果表明,汞元素富集层位(龙马溪组底部)对应着海洋生产力指标(总有机碳和生源钡)的高值,同时,上扬子地区多个剖面的火山凝灰岩的厚度分布与有机碳含量空间分布有很好的对应关系,亦表明火山作用与有机质富集具有紧密联系.因此,认为多期次的、广泛的火山喷发可能是奥陶纪与志留纪之交中上扬子地区有机质富集的重要原因.

       

    • 图  1  (a) 晚奥陶世(∼444 Ma)全球古地理图;(b)晚奥陶世华南板块古地理图(Chen et al., 2004);(c)研究剖面地理位置

      图中红色五星为研究钻井位置

      Fig.  1.  (a) Global paleogeographic map for Late Ordovician (∼444 Ma); (b) Late Ordovician paleogeographic map of the South China Craton (Chen et al., 2004); (c) Location of JY143⁃5 core in Chongqing

      图  2  JY143⁃5井五峰组-龙马溪组地化指标变化曲线

      a. 汞浓度(10-9);b. 总有机碳含量(%);c. 总硫(%);d. 汞和总硫比值[10-9(%)];e. 钡和铝比值[10-6(%)]

      Fig.  2.  Geochemical profiles of Jingwufeng⁃Longmaxi formations

      图  3  汞和其他元素含量相关图

      a. 汞(Hg)和总硫(TS);b. 汞(Hg)总有机碳(TOC);c. 汞(Hg)和铝(Al);d. 汞(Hg)和锰(Mn);括号里的数字表示样本数

      Fig.  3.  Correlation diagram of mercury and other elements

      图  4  JY143⁃5钻井和其他剖面汞元素记录

      阴影部分表示汞富集层位;焦页、盐志和漆辽数据来自Shen et al.(2019b);秀山数据来自胡东平(2017)

      Fig.  4.  Hg concentrations distributions in different sections

      图  5  扬子板块凝灰岩时空分布

      古地理图引自Chen et al., (2004),有修改,图例见图 1;据苏文博等(2002)陆扬博等(2017)舒逸等(2017)王玉满等(2017, 2019);熊国庆等(2017)

      Fig.  5.  Temporal and spatial distribution of tuff of the Yangtze Block

      图  6  中上扬子地区凝灰岩层数(a)、总有机碳(TOC)含量分布(b)以及TOC含量统计(c)

      Fig.  6.  Volcanic ash beds (a), TOC (b) and box plot of concentrations of total organic carbon (TOC) (c)

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