Microbial microsequences modulated by storm dynamics in lower shoreface deposits: A case study from the early Ediacaran, Cerro Largo Formation, Argentina.
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| Title: | Microbial microsequences modulated by storm dynamics in lower shoreface deposits: A case study from the early Ediacaran, Cerro Largo Formation, Argentina. |
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| Authors: | Arrouy, María Julia1 (AUTHOR) jarrouy@ihlla.org.ar, Noffke, Nora2 (AUTHOR), Cuadrado, Diana G.3 (AUTHOR), Warren, Lucas V.4 (AUTHOR), Ferreyra, Camila5 (AUTHOR), Gómez‐Peral, Lucia E.5 (AUTHOR), Poiré, Daniel G.5 (AUTHOR) |
| Source: | Sedimentology. Jun2026, Vol. 73 Issue 4, p982-1000. 19p. |
| Subject Terms: | *Microbial mats, *Ediacaran fossils, *Raman spectroscopy, *Sediment microbiology, *Sedimentary rocks, *Grain size, *Storms, *Geological formations |
| Geographic Terms: | Argentina |
| Abstract: | A detailed study of 2‐mm‐scale microsequences visible in thin‐section of cores from the early Ediacaran Cerro Largo Formation (Argentina) reveals recurrent storm–quiescence cycles within a storm‐dominated lower shoreface. Each microsequence is characterised by individual intervals stacked upon each other. Each interval shows from base to top a decline in grain size recording hydrodynamic thresholds. Concomitant grain size decreases, thickness increases and frequency of microbial mat lamination is typical. Petrographic analyses document well‐preserved endobenthic and epibenthic mats in such intervals. Each mat type has a distinct stabilisation modus. Raman spectroscopy confirms the presence of disordered carbonaceous matter interpreted as thermally mature microbial fossils. Hydraulic calculations place the fair‐weather wave base between intervals II to III (Microsequence I) and I to II (Microsequence II) and the storm wave base within intervals IV to V. Microbial mats increase erosion thresholds by up to 12‐fold, thereby ensuring the preservation of microbial lamination and their substrate under conditions that would otherwise favour reworking. This fine‐scale record of physical–microbial interactions may constitute a tool to resolve storm frequencies and matground development, especially for mat‐rich Ediacaran shoreface settings. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 194450291 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Microbial microsequences modulated by storm dynamics in lower shoreface deposits: A case study from the early Ediacaran, Cerro Largo Formation, Argentina. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Arrouy%2C+María+Julia%22">Arrouy, María Julia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jarrouy@ihlla.org.ar</i><br /><searchLink fieldCode="AR" term="%22Noffke%2C+Nora%22">Noffke, Nora</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cuadrado%2C+Diana+G%2E%22">Cuadrado, Diana G.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Warren%2C+Lucas+V%2E%22">Warren, Lucas V.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ferreyra%2C+Camila%22">Ferreyra, Camila</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gómez‐Peral%2C+Lucia+E%2E%22">Gómez‐Peral, Lucia E.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Poiré%2C+Daniel+G%2E%22">Poiré, Daniel G.</searchLink><relatesTo>5</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Sedimentology%22">Sedimentology</searchLink>. Jun2026, Vol. 73 Issue 4, p982-1000. 19p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Microbial+mats%22">Microbial mats</searchLink><br />*<searchLink fieldCode="DE" term="%22Ediacaran+fossils%22">Ediacaran fossils</searchLink><br />*<searchLink fieldCode="DE" term="%22Raman+spectroscopy%22">Raman spectroscopy</searchLink><br />*<searchLink fieldCode="DE" term="%22Sediment+microbiology%22">Sediment microbiology</searchLink><br />*<searchLink fieldCode="DE" term="%22Sedimentary+rocks%22">Sedimentary rocks</searchLink><br />*<searchLink fieldCode="DE" term="%22Grain+size%22">Grain size</searchLink><br />*<searchLink fieldCode="DE" term="%22Storms%22">Storms</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+formations%22">Geological formations</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Argentina%22">Argentina</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A detailed study of 2‐mm‐scale microsequences visible in thin‐section of cores from the early Ediacaran Cerro Largo Formation (Argentina) reveals recurrent storm–quiescence cycles within a storm‐dominated lower shoreface. Each microsequence is characterised by individual intervals stacked upon each other. Each interval shows from base to top a decline in grain size recording hydrodynamic thresholds. Concomitant grain size decreases, thickness increases and frequency of microbial mat lamination is typical. Petrographic analyses document well‐preserved endobenthic and epibenthic mats in such intervals. Each mat type has a distinct stabilisation modus. Raman spectroscopy confirms the presence of disordered carbonaceous matter interpreted as thermally mature microbial fossils. Hydraulic calculations place the fair‐weather wave base between intervals II to III (Microsequence I) and I to II (Microsequence II) and the storm wave base within intervals IV to V. Microbial mats increase erosion thresholds by up to 12‐fold, thereby ensuring the preservation of microbial lamination and their substrate under conditions that would otherwise favour reworking. This fine‐scale record of physical–microbial interactions may constitute a tool to resolve storm frequencies and matground development, especially for mat‐rich Ediacaran shoreface settings. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1111/sed.70084 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 19 StartPage: 982 Subjects: – SubjectFull: Microbial mats Type: general – SubjectFull: Ediacaran fossils Type: general – SubjectFull: Raman spectroscopy Type: general – SubjectFull: Sediment microbiology Type: general – SubjectFull: Sedimentary rocks Type: general – SubjectFull: Grain size Type: general – SubjectFull: Storms Type: general – SubjectFull: Geological formations Type: general – SubjectFull: Argentina Type: general Titles: – TitleFull: Microbial microsequences modulated by storm dynamics in lower shoreface deposits: A case study from the early Ediacaran, Cerro Largo Formation, Argentina. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Arrouy, María Julia – PersonEntity: Name: NameFull: Noffke, Nora – PersonEntity: Name: NameFull: Cuadrado, Diana G. – PersonEntity: Name: NameFull: Warren, Lucas V. – PersonEntity: Name: NameFull: Ferreyra, Camila – PersonEntity: Name: NameFull: Gómez‐Peral, Lucia E. – PersonEntity: Name: NameFull: Poiré, Daniel G. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00370746 Numbering: – Type: volume Value: 73 – Type: issue Value: 4 Titles: – TitleFull: Sedimentology Type: main |
| ResultId | 1 |
