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New insights into factors controlling the extraordinarily high organic matter accumulation across the Ordovician-Silurian transition, South China.

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Title: New insights into factors controlling the extraordinarily high organic matter accumulation across the Ordovician-Silurian transition, South China.
Authors: Qiu, Zhen1,2 qiuzhen316@163.com, Wei, Hengye2,3 hy.wei@swpu.edu.cn, Zhang, Jiaqiang2,3, Kong, Weiliang1, Zhang, Qin1, Liu, Wen1, Wen, Yue2,3
Source: Geological Society of America Bulletin. May/Jun2026, Vol. 138 Issue 5/6, p2237-2254. 18p.
Subject Terms: *Volcanism, *Weathering, *Anoxic waters, *Ordovician Period, *Organic compounds, *Hydrothermal deposits, *Shale
Geographic Terms: China
Abstract: The Ordovician-Silurian (O-S) transition was marked by widespread deposition of organic-rich shales worldwide. However, the mechanism of organic matter accumulation remains debated. Previous studies mainly focus on primary productivity versus preservation conditions. Here, we emphasize the mechanisms driving accumulation of the extraordinarily high organic matter (EHOM) with total organic carbon (TOC) content over 3.0 wt%. In this study, the Wufeng-Lungmachi shale formations of two sections across the O-S transition on the northern margin of the Yangtze Shelf, South China, were investigated for TOC, elemental geochemistry, petrology of barite and pyrite concretions, and pyrite sulfur isotopes. Our results reveal two step-wise increases of TOC content identified as two episodes of EHOM accumulation. The first episode of EHOM enrichment in the Upper Ordovician was likely triggered by increased nutrient input from hydrothermal activity related to volcanism and probably upwelling events. The second episode, marked by large-scale EHOM enrichment in the Lower Silurian, was driven by large nutrient supply from enhanced continental weathering following the Hirnantian deglaciation and from enhanced phosphorus recycling under widespread ocean euxinia. These findings suggest that geological events acted as the primary triggers for the EHOM enrichment, and could sustain EHOM accumulation over longer time scales by affecting environmental factors. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 193740925
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: New insights into factors controlling the extraordinarily high organic matter accumulation across the Ordovician-Silurian transition, South China.
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  Data: <searchLink fieldCode="AR" term="%22Qiu%2C+Zhen%22">Qiu, Zhen</searchLink><relatesTo>1,2</relatesTo><i> qiuzhen316@163.com</i><br /><searchLink fieldCode="AR" term="%22Wei%2C+Hengye%22">Wei, Hengye</searchLink><relatesTo>2,3</relatesTo><i> hy.wei@swpu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Jiaqiang%22">Zhang, Jiaqiang</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Kong%2C+Weiliang%22">Kong, Weiliang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Qin%22">Zhang, Qin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Liu%2C+Wen%22">Liu, Wen</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wen%2C+Yue%22">Wen, Yue</searchLink><relatesTo>2,3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Geological+Society+of+America+Bulletin%22">Geological Society of America Bulletin</searchLink>. May/Jun2026, Vol. 138 Issue 5/6, p2237-2254. 18p.
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  Data: *<searchLink fieldCode="DE" term="%22Volcanism%22">Volcanism</searchLink><br />*<searchLink fieldCode="DE" term="%22Weathering%22">Weathering</searchLink><br />*<searchLink fieldCode="DE" term="%22Anoxic+waters%22">Anoxic waters</searchLink><br />*<searchLink fieldCode="DE" term="%22Ordovician+Period%22">Ordovician Period</searchLink><br />*<searchLink fieldCode="DE" term="%22Organic+compounds%22">Organic compounds</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrothermal+deposits%22">Hydrothermal deposits</searchLink><br />*<searchLink fieldCode="DE" term="%22Shale%22">Shale</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22China%22">China</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Ordovician-Silurian (O-S) transition was marked by widespread deposition of organic-rich shales worldwide. However, the mechanism of organic matter accumulation remains debated. Previous studies mainly focus on primary productivity versus preservation conditions. Here, we emphasize the mechanisms driving accumulation of the extraordinarily high organic matter (EHOM) with total organic carbon (TOC) content over 3.0 wt%. In this study, the Wufeng-Lungmachi shale formations of two sections across the O-S transition on the northern margin of the Yangtze Shelf, South China, were investigated for TOC, elemental geochemistry, petrology of barite and pyrite concretions, and pyrite sulfur isotopes. Our results reveal two step-wise increases of TOC content identified as two episodes of EHOM accumulation. The first episode of EHOM enrichment in the Upper Ordovician was likely triggered by increased nutrient input from hydrothermal activity related to volcanism and probably upwelling events. The second episode, marked by large-scale EHOM enrichment in the Lower Silurian, was driven by large nutrient supply from enhanced continental weathering following the Hirnantian deglaciation and from enhanced phosphorus recycling under widespread ocean euxinia. These findings suggest that geological events acted as the primary triggers for the EHOM enrichment, and could sustain EHOM accumulation over longer time scales by affecting environmental factors. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1130/B38575.1
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 18
        StartPage: 2237
    Subjects:
      – SubjectFull: Volcanism
        Type: general
      – SubjectFull: Weathering
        Type: general
      – SubjectFull: Anoxic waters
        Type: general
      – SubjectFull: Ordovician Period
        Type: general
      – SubjectFull: Organic compounds
        Type: general
      – SubjectFull: Hydrothermal deposits
        Type: general
      – SubjectFull: Shale
        Type: general
      – SubjectFull: China
        Type: general
    Titles:
      – TitleFull: New insights into factors controlling the extraordinarily high organic matter accumulation across the Ordovician-Silurian transition, South China.
        Type: main
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            NameFull: Qiu, Zhen
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            NameFull: Wei, Hengye
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            NameFull: Zhang, Jiaqiang
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            NameFull: Kong, Weiliang
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            NameFull: Zhang, Qin
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            NameFull: Liu, Wen
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            – D: 01
              M: 05
              Text: May/Jun2026
              Type: published
              Y: 2026
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            – Type: issn-print
              Value: 00167606
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            – Type: volume
              Value: 138
            – Type: issue
              Value: 5/6
          Titles:
            – TitleFull: Geological Society of America Bulletin
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