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Illite 40Ar/39Ar low‐temperature mini‐plateaux: Enlightenment on hydrocarbon accumulation.

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Title: Illite 40Ar/39Ar low‐temperature mini‐plateaux: Enlightenment on hydrocarbon accumulation.
Authors: Wu, Yang1,2 (AUTHOR), He, Li‐Yan3 (AUTHOR), Shi, He‐Sheng4 (AUTHOR), Qiu, Hua‐Ning1,5,6 (AUTHOR) huaningqiu@cug.edu.cn
Source: Sedimentology. Aug2026, Vol. 73 Issue 5, p1546-1570. 25p.
Subjects: Illite, Argon-argon dating, Sedimentary basins, Minerals, Hydrocarbon reservoirs
Geographic Terms: South China Sea, China
Abstract: Authigenic illite samples from the Baiyun Sag of the Pearl River Mouth Basin, South China Sea, were analysed by 40Ar/39Ar laser stepwise heating. Novel techniques were applied to distinguish authigenic illite signal from detrital contamination: (1) a fine‐step heating technique was elaborately applied to gently release argon from authigenic illite at low laser power steps and avoid the argon from coarse‐grained detrital minerals and (2) a powerful purification system including a temperature‐controlled cryotrap was employed to remove most organic matter. In this study, sample BY39 yielded a well‐defined low‐temperature mini‐plateau with a mini‐plateau age of 15.0 ± 0.7 Ma (2σ, 12 consecutive steps). Sample BY53 exhibited a low‐temperature segment with a weighted mean age of 16.5 ± 0.3 Ma (2σ, 8 consecutive steps), which, despite a subtle ascending trend, aligns with the age limit of BY39. These results represent the first reported instance of authigenic illite mini‐plateaux obtained from complex mineral mixtures. The robust nature of the BY39 mini‐plateau suggests that the youngest illite generation is not a trace component but represents a significant volumetric pulse of mineral growth, providing a sufficient argon budget to sustain multiple concordant steps. This rapid illitisation might be triggered by transient fluid pulses laden with CO2 and organic acids derived from kerogen and oil cracking. The brief acceleration instead of an immediate cessation of illite formation during hydrocarbon accumulation provides a solid foundation for dating petroleum accumulation by the authigenic illite 40Ar/39Ar fine‐step heating technique. Additionally, high‐temperature heating steps yielded detrital ages (76 to 217 Ma) that reflect the provenance contribution of Mesozoic granites from South China to the Baiyun Sag. [ABSTRACT FROM AUTHOR]
Copyright of Sedimentology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 195681995
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Illite <superscript>40</superscript>Ar/<superscript>39</superscript>Ar low‐temperature mini‐plateaux: Enlightenment on hydrocarbon accumulation.
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  Data: <searchLink fieldCode="DE" term="%22Illite%22">Illite</searchLink><br /><searchLink fieldCode="DE" term="%22Argon-argon+dating%22">Argon-argon dating</searchLink><br /><searchLink fieldCode="DE" term="%22Sedimentary+basins%22">Sedimentary basins</searchLink><br /><searchLink fieldCode="DE" term="%22Minerals%22">Minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrocarbon+reservoirs%22">Hydrocarbon reservoirs</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22South+China+Sea%22">South China Sea</searchLink><br /><searchLink fieldCode="DE" term="%22China%22">China</searchLink>
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  Label: Abstract
  Group: Ab
  Data: Authigenic illite samples from the Baiyun Sag of the Pearl River Mouth Basin, South China Sea, were analysed by 40Ar/39Ar laser stepwise heating. Novel techniques were applied to distinguish authigenic illite signal from detrital contamination: (1) a fine‐step heating technique was elaborately applied to gently release argon from authigenic illite at low laser power steps and avoid the argon from coarse‐grained detrital minerals and (2) a powerful purification system including a temperature‐controlled cryotrap was employed to remove most organic matter. In this study, sample BY39 yielded a well‐defined low‐temperature mini‐plateau with a mini‐plateau age of 15.0 ± 0.7 Ma (2σ, 12 consecutive steps). Sample BY53 exhibited a low‐temperature segment with a weighted mean age of 16.5 ± 0.3 Ma (2σ, 8 consecutive steps), which, despite a subtle ascending trend, aligns with the age limit of BY39. These results represent the first reported instance of authigenic illite mini‐plateaux obtained from complex mineral mixtures. The robust nature of the BY39 mini‐plateau suggests that the youngest illite generation is not a trace component but represents a significant volumetric pulse of mineral growth, providing a sufficient argon budget to sustain multiple concordant steps. This rapid illitisation might be triggered by transient fluid pulses laden with CO2 and organic acids derived from kerogen and oil cracking. The brief acceleration instead of an immediate cessation of illite formation during hydrocarbon accumulation provides a solid foundation for dating petroleum accumulation by the authigenic illite 40Ar/39Ar fine‐step heating technique. Additionally, high‐temperature heating steps yielded detrital ages (76 to 217 Ma) that reflect the provenance contribution of Mesozoic granites from South China to the Baiyun Sag. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Sedimentology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1111/sed.70102
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      – Code: eng
        Text: English
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        PageCount: 25
        StartPage: 1546
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      – SubjectFull: Illite
        Type: general
      – SubjectFull: Argon-argon dating
        Type: general
      – SubjectFull: Sedimentary basins
        Type: general
      – SubjectFull: Minerals
        Type: general
      – SubjectFull: Hydrocarbon reservoirs
        Type: general
      – SubjectFull: South China Sea
        Type: general
      – SubjectFull: China
        Type: general
    Titles:
      – TitleFull: Illite 40Ar/39Ar low‐temperature mini‐plateaux: Enlightenment on hydrocarbon accumulation.
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            NameFull: Wu, Yang
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            NameFull: He, Li‐Yan
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            NameFull: Shi, He‐Sheng
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              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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