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Morphological and geochemical variation in framboidal pyrite aggregates and implications for use as a methane seepage proxy.

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Title: Morphological and geochemical variation in framboidal pyrite aggregates and implications for use as a methane seepage proxy.
Authors: Song, Qiang1,2 (AUTHOR), Wang, Jiasheng1,2 (AUTHOR) js-wang@cug.edu.cn, Algeo, Thomas J.2,3,4 (AUTHOR), Wang, Zhou1,2 (AUTHOR), Chen, Can5 (AUTHOR), Geng, Kunlong1,2 (AUTHOR), Li, Qing6 (AUTHOR)
Source: Geochimica et Cosmochimica Acta. Jul2026, Vol. 424, p91-101. 11p.
Subjects: Pyrites, Analytical geochemistry, Paleoenvironmental studies, Morphology, Trace elements, Iron sulfides, Cold seeps
Abstract: Framboidal pyrite in modern sediments occurs predominantly as isolated framboids and aggregates of a few distinct morphotypes (e.g., irregular-shaped, rod-like, and foram-fill). However, there has been little study to date of potential disparities in geochemical proxy signals among these aggregate morphotypes. Here, we present a morphotype-specific morphological and geochemical dataset comprising framboid size, δ34S, and trace-element compositional data for framboidal pyrite aggregates recovered from IODP Expedition 311 Site U1329C on the Cascadia Margin, an area of both modern and ancient methane seepage. Our results demonstrate that there is significant geochemical variation among different co-occurring aggregate morphotypes. The observed heterogeneity reflects differences in formation microenvironments (e.g., porewater connectivity, spatial confinement, local material supply) and, more fundamentally, the polygenetic nature of pyrite populations. We demonstrate that the traditional approach of analyzing bulk pyrite consisting of a mixture of isolated framboids and aggregate morphotypes likely obscures or distorts paleo-environmental signals. Therefore, we conclude that morphotype-specific analysis is essential for accurate interpretation of pyrite-based geochemical proxies. This study provides a valuable framework for research that relies on pyrite-based geochemical indicators to reconstruct paleoenvironmental and methane seepage history. [ABSTRACT FROM AUTHOR]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science 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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Header DbId: egs
DbLabel: Engineering Source
An: 194634942
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Morphological and geochemical variation in framboidal pyrite aggregates and implications for use as a methane seepage proxy.
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  Data: <searchLink fieldCode="AR" term="%22Song%2C+Qiang%22">Song, Qiang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Jiasheng%22">Wang, Jiasheng</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> js-wang@cug.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Algeo%2C+Thomas+J%2E%22">Algeo, Thomas J.</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Zhou%22">Wang, Zhou</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Can%22">Chen, Can</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Geng%2C+Kunlong%22">Geng, Kunlong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Qing%22">Li, Qing</searchLink><relatesTo>6</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Jul2026, Vol. 424, p91-101. 11p.
– Name: Subject
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  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Pyrites%22">Pyrites</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+geochemistry%22">Analytical geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Paleoenvironmental+studies%22">Paleoenvironmental studies</searchLink><br /><searchLink fieldCode="DE" term="%22Morphology%22">Morphology</searchLink><br /><searchLink fieldCode="DE" term="%22Trace+elements%22">Trace elements</searchLink><br /><searchLink fieldCode="DE" term="%22Iron+sulfides%22">Iron sulfides</searchLink><br /><searchLink fieldCode="DE" term="%22Cold+seeps%22">Cold seeps</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Framboidal pyrite in modern sediments occurs predominantly as isolated framboids and aggregates of a few distinct morphotypes (e.g., irregular-shaped, rod-like, and foram-fill). However, there has been little study to date of potential disparities in geochemical proxy signals among these aggregate morphotypes. Here, we present a morphotype-specific morphological and geochemical dataset comprising framboid size, δ34S, and trace-element compositional data for framboidal pyrite aggregates recovered from IODP Expedition 311 Site U1329C on the Cascadia Margin, an area of both modern and ancient methane seepage. Our results demonstrate that there is significant geochemical variation among different co-occurring aggregate morphotypes. The observed heterogeneity reflects differences in formation microenvironments (e.g., porewater connectivity, spatial confinement, local material supply) and, more fundamentally, the polygenetic nature of pyrite populations. We demonstrate that the traditional approach of analyzing bulk pyrite consisting of a mixture of isolated framboids and aggregate morphotypes likely obscures or distorts paleo-environmental signals. Therefore, we conclude that morphotype-specific analysis is essential for accurate interpretation of pyrite-based geochemical proxies. This study provides a valuable framework for research that relies on pyrite-based geochemical indicators to reconstruct paleoenvironmental and methane seepage history. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=194634942
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.gca.2026.05.023
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 91
    Subjects:
      – SubjectFull: Pyrites
        Type: general
      – SubjectFull: Analytical geochemistry
        Type: general
      – SubjectFull: Paleoenvironmental studies
        Type: general
      – SubjectFull: Morphology
        Type: general
      – SubjectFull: Trace elements
        Type: general
      – SubjectFull: Iron sulfides
        Type: general
      – SubjectFull: Cold seeps
        Type: general
    Titles:
      – TitleFull: Morphological and geochemical variation in framboidal pyrite aggregates and implications for use as a methane seepage proxy.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Song, Qiang
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          Name:
            NameFull: Wang, Jiasheng
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            NameFull: Algeo, Thomas J.
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            NameFull: Wang, Zhou
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            NameFull: Chen, Can
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            NameFull: Geng, Kunlong
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            NameFull: Li, Qing
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          Dates:
            – D: 01
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 00167037
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            – Type: volume
              Value: 424
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            – TitleFull: Geochimica et Cosmochimica Acta
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