Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2018, Vol. 54 ›› Issue (4): 739-751.DOI: 10.13209/j.0479-8023.2017.133

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Redox Variation during the Early and Middle Ordovician in South China and Its Implication to the Great Ordovician Biodiversification Event

DONG Yiting1, LIU Jianbo1,2,†, CHEN Yuxuan1, ZHONG Si1, ZHAN Renbin3   

  1. 1. School of Earth and Space Sciences, Peking University, Beijing 100871
    2. The Key Laboratory of Orogenic Belts and Crustal Evolution (MOE), Beijing 100871
    3. Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008
  • Received:2017-04-23 Revised:2017-06-22 Online:2018-07-20 Published:2018-07-20
  • Contact: LIU Jianbo, E-mail: jbliu(at)


董轶婷1, 刘建波1,2,†, 陈宇轩1, 钟思1, 詹仁斌3   

  1. 1. 北京大学地球与空间科学学院, 北京 100871
    2. 造山带与地壳演化教育部重点实验室, 北京 100871
    3. 现代古生物学与地层学国家重点实验室, 中国科学院南京地质古生物研究所, 南京 210008
  • 通讯作者: 刘建波, E-mail: jbliu(at)
  • 基金资助:
    国家自然科学基金(41272035, 41290260, 41530103)资助


To improve understanding of the environmental influential and controlling factors of the Great Ordovician Biodiversification Event (GOBE), total organic carbon content (TOC), total sulfur content (TS), and sulfur isotope of pyrite (δ34Spy) of black shale of the Jiangjunling section, in southern Anhui Province, China are analyzed. TOC and TS show positive correlation, indicating non-euxinic environment. δ34Spy exhibits obvious decrease in Floian and more oscillation in the Middle Ordovician. Combined with global sulfur isotope of carbonate-associated sulfate (δ34SCAS) and δ34Spy data from previous researches, a marine oxygenation event is suggested by decreasing pyrite burial and increasing sulfur isotopic fractionation during the latest Tremadocian to middle Floian, which might boost GOBE. During the late Floian to Darriwilian, δ34SCAS from different areas decreases in succession, while δ34Spy is characterized by large oscillation, which is contributed to low sulfate concentration and sulfide reoxidation in the ocean.

Key words: sulfur isotope, Early to Middle Ordovician, redox condition of seawater, the Great Ordovician Biodiversification Event, South China


为了进一步探讨奥陶纪生物大辐射期间环境影响和控制因素, 对安徽南部将军岭剖面黑色页岩的有机碳含量(TOC)、总硫含量(TS)和黄铁矿硫同位素(δ34Spy)进行测试分析。TOC与TS表现出正相关性, 说明可能是非硫化环境中的沉积产物。δ34Spy在弗洛期表现出显著的负偏移, 在中奥陶世表现出相对幅度更大的波动。结合前人对全球碳酸盐岩晶格中硫酸盐硫同位素(δ34SCAS)和δ34Spy数据的分析结果, 显示特马豆克期末期至弗洛期中期黄铁矿埋藏分数下降, 硫同位素分馏效应增大, 说明当时海水发生氧化, 对奥陶纪生物大辐射起到重要的促进作用。弗洛期晚期至达瑞威尔期, 不同地区δ34SCAS相继出现负偏移, δ34Spy发生大幅振荡, 可能是由于海洋中硫酸根浓度较低以及硫化物再氧化所致。

关键词: 硫同位素, 早-中奥陶世, 海水氧化还原, 奥陶纪生物大辐射事件, 华南

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