Paleoenvironmental evolution and source rock characterization of the Middle Jurassic Sargelu Formation (Dudan and Kezi sections, Zagros, Iran): insights into Tethyan basin dynamics and climate perturbations.
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| Title: | Paleoenvironmental evolution and source rock characterization of the Middle Jurassic Sargelu Formation (Dudan and Kezi sections, Zagros, Iran): insights into Tethyan basin dynamics and climate perturbations. |
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| Authors: | Daraei, Mehdi1 (AUTHOR) DaraeiMehdi@iasbs.ac.ir, Bayet-Goll, Aram1 (AUTHOR), Isanejad, Meysam1 (AUTHOR), Karimi, Soroush1 (AUTHOR), Esrafili-Dizaji, Behrooz2 (AUTHOR) |
| Source: | International Journal of Earth Sciences. Feb2026, Vol. 115 Issue 1, p1-26. 26p. |
| Subject Terms: | *Paleoenvironmental studies, *Rock analysis, *Tethys (Paleogeography), *Mesozoic Era, *Jurassic Period, *Stable isotopes, *Geological formations, *Climate change, *Paleogeography |
| Geographic Terms: | Zagros Mountains (Iran & Iraq), Iran |
| Abstract: | The Middle Jurassic Sargelu Formation in the western Iranian Zagros region provides critical insights into paleoenvironmental dynamics and source rock potential within the broader Tethyan domain. This study integrates sedimentological, stratigraphic, petrographic, organic geochemical, and stable isotope data from the Dudan and Kezi sections to constrain paleoenvironmental settings and hydrocarbon generative capacity. The formation reflects deposition in a deep intrashelf basin characterized by stratified water columns, euxinic conditions, and high productivity, as evidenced by organic-rich calcareous shales, Bositra-dominated limestones, and radiolarites. Sequence stratigraphic analysis reveals six medium-scale cycles, with organic enrichment commonly peaking within the transgressive systems tract (TST). Rock–Eval pyrolysis and stable isotope data indicate predominantly gas-prone, thermally post-mature Type III–IV kerogen, most likely derived from the alteration and depletion of original Type II kerogen, reflecting bottom-water redox conditions and organic matter preservation trends across fluctuating sea levels; however, localized intervals within the Kezi section retain moderate to good generative potential. A pronounced positive δ13C excursion corresponds with radiolarite deposition, and is interpreted to reflect Bajocian climate cooling and changes in oceanic carbon cycling within the Tethyan seaway. The integrated dataset supports a refined depositional model for the Sargelu Formation, offering insights into sequence stratigraphic correlation, petroleum prospectivity, and paleoceanographic evolution not only across the Arabian Plate but also within the broader context of Tethyan basins. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 190467707 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Paleoenvironmental evolution and source rock characterization of the Middle Jurassic Sargelu Formation (Dudan and Kezi sections, Zagros, Iran): insights into Tethyan basin dynamics and climate perturbations. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Daraei%2C+Mehdi%22">Daraei, Mehdi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> DaraeiMehdi@iasbs.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Bayet-Goll%2C+Aram%22">Bayet-Goll, Aram</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Isanejad%2C+Meysam%22">Isanejad, Meysam</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Karimi%2C+Soroush%22">Karimi, Soroush</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Esrafili-Dizaji%2C+Behrooz%22">Esrafili-Dizaji, Behrooz</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Earth+Sciences%22">International Journal of Earth Sciences</searchLink>. Feb2026, Vol. 115 Issue 1, p1-26. 26p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Paleoenvironmental+studies%22">Paleoenvironmental studies</searchLink><br />*<searchLink fieldCode="DE" term="%22Rock+analysis%22">Rock analysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Tethys+%28Paleogeography%29%22">Tethys (Paleogeography)</searchLink><br />*<searchLink fieldCode="DE" term="%22Mesozoic+Era%22">Mesozoic Era</searchLink><br />*<searchLink fieldCode="DE" term="%22Jurassic+Period%22">Jurassic Period</searchLink><br />*<searchLink fieldCode="DE" term="%22Stable+isotopes%22">Stable isotopes</searchLink><br />*<searchLink fieldCode="DE" term="%22Geological+formations%22">Geological formations</searchLink><br />*<searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink><br />*<searchLink fieldCode="DE" term="%22Paleogeography%22">Paleogeography</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Zagros+Mountains+%28Iran+%26+Iraq%29%22">Zagros Mountains (Iran & Iraq)</searchLink><br /><searchLink fieldCode="DE" term="%22Iran%22">Iran</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Middle Jurassic Sargelu Formation in the western Iranian Zagros region provides critical insights into paleoenvironmental dynamics and source rock potential within the broader Tethyan domain. This study integrates sedimentological, stratigraphic, petrographic, organic geochemical, and stable isotope data from the Dudan and Kezi sections to constrain paleoenvironmental settings and hydrocarbon generative capacity. The formation reflects deposition in a deep intrashelf basin characterized by stratified water columns, euxinic conditions, and high productivity, as evidenced by organic-rich calcareous shales, Bositra-dominated limestones, and radiolarites. Sequence stratigraphic analysis reveals six medium-scale cycles, with organic enrichment commonly peaking within the transgressive systems tract (TST). Rock–Eval pyrolysis and stable isotope data indicate predominantly gas-prone, thermally post-mature Type III–IV kerogen, most likely derived from the alteration and depletion of original Type II kerogen, reflecting bottom-water redox conditions and organic matter preservation trends across fluctuating sea levels; however, localized intervals within the Kezi section retain moderate to good generative potential. A pronounced positive δ13C excursion corresponds with radiolarite deposition, and is interpreted to reflect Bajocian climate cooling and changes in oceanic carbon cycling within the Tethyan seaway. The integrated dataset supports a refined depositional model for the Sargelu Formation, offering insights into sequence stratigraphic correlation, petroleum prospectivity, and paleoceanographic evolution not only across the Arabian Plate but also within the broader context of Tethyan basins. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00531-025-02550-x Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 26 StartPage: 1 Subjects: – SubjectFull: Paleoenvironmental studies Type: general – SubjectFull: Rock analysis Type: general – SubjectFull: Tethys (Paleogeography) Type: general – SubjectFull: Mesozoic Era Type: general – SubjectFull: Jurassic Period Type: general – SubjectFull: Stable isotopes Type: general – SubjectFull: Geological formations Type: general – SubjectFull: Climate change Type: general – SubjectFull: Paleogeography Type: general – SubjectFull: Zagros Mountains (Iran & Iraq) Type: general – SubjectFull: Iran Type: general Titles: – TitleFull: Paleoenvironmental evolution and source rock characterization of the Middle Jurassic Sargelu Formation (Dudan and Kezi sections, Zagros, Iran): insights into Tethyan basin dynamics and climate perturbations. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Daraei, Mehdi – PersonEntity: Name: NameFull: Bayet-Goll, Aram – PersonEntity: Name: NameFull: Isanejad, Meysam – PersonEntity: Name: NameFull: Karimi, Soroush – PersonEntity: Name: NameFull: Esrafili-Dizaji, Behrooz IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 14373254 Numbering: – Type: volume Value: 115 – Type: issue Value: 1 Titles: – TitleFull: International Journal of Earth Sciences Type: main |
| ResultId | 1 |
