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Microbial mats in the Río Mayer Formation (Lower Cretaceous), Austral Basin, Argentina: Paleoenvironmental and paleoceanographic significance.

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Title: Microbial mats in the Río Mayer Formation (Lower Cretaceous), Austral Basin, Argentina: Paleoenvironmental and paleoceanographic significance.
Authors: Carmona, Noelia Beatriz1,2 (AUTHOR) ncarmona@unrn.edu.ar, Ponce, Juan José1,2 (AUTHOR), Cevallos, Martín3 (AUTHOR), Jait, Damián M.3 (AUTHOR), Padva, Diego3 (AUTHOR), Cevallos, Manuel4 (AUTHOR)
Source: Sedimentology. Jun2026, Vol. 73 Issue 4, p1307-1325. 19p.
Subject Terms: *Microbial mats, *Paleoceanography, *Geological formations, *Paleoenvironmental studies, *Biogenic sedimentary rocks, *Hydrocarbon manufacturing, *Geological basins, *Cretaceous Period
Geographic Terms: Argentina
Abstract: This contribution focuses on studying microbial mats in the Lower Cretaceous marine succession of the Río Mayer Formation, at Estancia Cristina locality, Austral Basin, Argentina. This formation has been the subject of increasing study in recent years due to its potential as an unconventional reservoir and ongoing exploration efforts. The main purpose of this work was to identify the occurrence of microbial activity from the characterisation and interpretation of microbially induced sedimentary structures (MISS), and to integrate this information with sedimentological and ichnological data to determine the paleoenvironmental and paleoecological conditions under which they formed. Macro‐and microscopic studies done in the field and in the laboratory allowed us to identify different MISS, such as biolaminations, wrinkle structures, microbial remnants, layers with pyrite enrichment and sponge pore fabric. In SEM images, it was also possible to identify filaments and levels with fossilised extracellular polymeric substances (EPS). Four main facies associations (FA1–FA4), representing upper to lower offshore, inner shelf, inner shelf to upper offshore, and lower offshore, respectively, have been recognised in this section. Combined sedimentological, ichnological and geobiological analysis allowed us to infer that upwelling processes acted in the Austral Basin during the deposition of this formation. In addition, it is also discussed that the extensive occurrence of microbial mats in the basin may have helped preserve and provide, at least partially, the organic matter that led to the generation of hydrocarbons in the Río Mayer Formation. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
FullText Text:
  Availability: 0
Header DbId: enr
DbLabel: Energy & Power Source
An: 194450290
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Microbial mats in the Río Mayer Formation (Lower Cretaceous), Austral Basin, Argentina: Paleoenvironmental and paleoceanographic significance.
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  Data: <searchLink fieldCode="AR" term="%22Carmona%2C+Noelia+Beatriz%22">Carmona, Noelia Beatriz</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> ncarmona@unrn.edu.ar</i><br /><searchLink fieldCode="AR" term="%22Ponce%2C+Juan+José%22">Ponce, Juan José</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cevallos%2C+Martín%22">Cevallos, Martín</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jait%2C+Damián+M%2E%22">Jait, Damián M.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Padva%2C+Diego%22">Padva, Diego</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cevallos%2C+Manuel%22">Cevallos, Manuel</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Sedimentology%22">Sedimentology</searchLink>. Jun2026, Vol. 73 Issue 4, p1307-1325. 19p.
– Name: Subject
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  Data: *<searchLink fieldCode="DE" term="%22Microbial+mats%22">Microbial mats</searchLink><br />*<searchLink fieldCode="DE" term="%22Paleoceanography%22">Paleoceanography</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+formations%22">Geological formations</searchLink><br />*<searchLink fieldCode="DE" term="%22Paleoenvironmental+studies%22">Paleoenvironmental studies</searchLink><br />*<searchLink fieldCode="DE" term="%22Biogenic+sedimentary+rocks%22">Biogenic sedimentary rocks</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrocarbon+manufacturing%22">Hydrocarbon manufacturing</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+basins%22">Geological basins</searchLink><br />*<searchLink fieldCode="DE" term="%22Cretaceous+Period%22">Cretaceous Period</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Argentina%22">Argentina</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: This contribution focuses on studying microbial mats in the Lower Cretaceous marine succession of the Río Mayer Formation, at Estancia Cristina locality, Austral Basin, Argentina. This formation has been the subject of increasing study in recent years due to its potential as an unconventional reservoir and ongoing exploration efforts. The main purpose of this work was to identify the occurrence of microbial activity from the characterisation and interpretation of microbially induced sedimentary structures (MISS), and to integrate this information with sedimentological and ichnological data to determine the paleoenvironmental and paleoecological conditions under which they formed. Macro‐and microscopic studies done in the field and in the laboratory allowed us to identify different MISS, such as biolaminations, wrinkle structures, microbial remnants, layers with pyrite enrichment and sponge pore fabric. In SEM images, it was also possible to identify filaments and levels with fossilised extracellular polymeric substances (EPS). Four main facies associations (FA1–FA4), representing upper to lower offshore, inner shelf, inner shelf to upper offshore, and lower offshore, respectively, have been recognised in this section. Combined sedimentological, ichnological and geobiological analysis allowed us to infer that upwelling processes acted in the Austral Basin during the deposition of this formation. In addition, it is also discussed that the extensive occurrence of microbial mats in the basin may have helped preserve and provide, at least partially, the organic matter that led to the generation of hydrocarbons in the Río Mayer Formation. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=194450290
RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/sed.70070
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 1307
    Subjects:
      – SubjectFull: Microbial mats
        Type: general
      – SubjectFull: Paleoceanography
        Type: general
      – SubjectFull: Geological formations
        Type: general
      – SubjectFull: Paleoenvironmental studies
        Type: general
      – SubjectFull: Biogenic sedimentary rocks
        Type: general
      – SubjectFull: Hydrocarbon manufacturing
        Type: general
      – SubjectFull: Geological basins
        Type: general
      – SubjectFull: Cretaceous Period
        Type: general
      – SubjectFull: Argentina
        Type: general
    Titles:
      – TitleFull: Microbial mats in the Río Mayer Formation (Lower Cretaceous), Austral Basin, Argentina: Paleoenvironmental and paleoceanographic significance.
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          Name:
            NameFull: Carmona, Noelia Beatriz
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            NameFull: Ponce, Juan José
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            NameFull: Cevallos, Martín
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            NameFull: Jait, Damián M.
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            NameFull: Padva, Diego
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 00370746
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              Value: 73
            – Type: issue
              Value: 4
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            – TitleFull: Sedimentology
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