Quantitative modelling of multiphase tectonic subsidence mechanism and lithospheric stretching controls on the evolution of the Central Kotla Graben, Sirt Basin, Libya.
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| Title: | Quantitative modelling of multiphase tectonic subsidence mechanism and lithospheric stretching controls on the evolution of the Central Kotla Graben, Sirt Basin, Libya. |
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| Authors: | Gumati, Mohammed.S.1,2 (AUTHOR) mohamed.gumati@uob.edu.ly, Redfern, J.2 (AUTHOR) |
| Source: | Journal of Geodynamics. Sep2025, Vol. 165, pN.PAG-N.PAG. 1p. |
| Subjects: | Grabens (Geology), Land subsidence, Seismic reflection method, Geological cycles, Quantitative research, Rifts (Geology) |
| Geographic Terms: | Libya |
| Abstract: | The Kotla Graben remains a poorly investigated region. Understanding the architecture of the graben and adjacent basement highs through time is critical for resolving due to the impacts of transitional accelerated subsidence to thermal sagging and basin-bounding fault reactivation mechanisms that create such a graben. This study attempts to restore the Late Cretaceous-Middle Eocene geometry of the Central Kotla Graben, using a combination of well data from 47 boreholes and twenty-six 2D seismic reflection profiles, nine of which are selected to show examples of the new information on the present-day architecture of the deeply buried graben. This geological and geophysical integration has enabled many variables to be involved in backstripping and lithospheric stretching calculations. The shape of backstripped subsidence curves reveals four discrete tectonic (I–IV) phases of subsidence-uplift that are recognised with variable rates and separated by three different types of unconformities. The rifting initiated during the Cenomanian, and both highs were uplifted during the Santonian. The rifting peaked during the Palaeocene and was terminated by a thermal sagging phase during the Eocene. Seismic interpretation indicates that the acoustic basement is generally characterised by three main intra-basement reflection (IRP) packages, located within the Dahra Platform basement and referred to as the Dahra Shear Zone in this study. However, seismic analysis has also enabled the recognition of four different seismic facies units. These facies units are integrated with three recognised gamma-ray log trends to correlate lithological variations within the distinctive boundaries of the tectonic subsidence phases. The tectonic subsidence maps of the graben geometry indicate that during the syn- and post-rift phases, the depocentre of the Central Kotla Graben is located in the south. Two different techniques used to estimate the stretching factor (β): The subsidence-derived stretching revealed lithospheric stretching ranged from 1.0 to 1.5. Moreover, the fault-derived stretching across the Central Kotla Graben ranged from 1.5 to 2, suggesting that the maximum crustal stretching in the graben axis ranges from 50 % to 100 %. This discrepancy is described as "extension discrepancy". • 2D seismic reflection data allow the proper geometry of the deeply buried ancient, elongated graben and adjacent basement highs to be mapped. • Four discrete tectonic phases of various syn-rift, post-rift tectonic evolution and uplift were recognised. • Two different techniques were used to estimate the stretching factor (β). • Three main intra-basement reflection (IRP) packages were recognised. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geodynamics is the property of Elsevier B.V. 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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 187838054 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Quantitative modelling of multiphase tectonic subsidence mechanism and lithospheric stretching controls on the evolution of the Central Kotla Graben, Sirt Basin, Libya. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Gumati%2C+Mohammed%2ES%2E%22">Gumati, Mohammed.S.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> mohamed.gumati@uob.edu.ly</i><br /><searchLink fieldCode="AR" term="%22Redfern%2C+J%2E%22">Redfern, J.</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geodynamics%22">Journal of Geodynamics</searchLink>. Sep2025, Vol. 165, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Grabens+%28Geology%29%22">Grabens (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Land+subsidence%22">Land subsidence</searchLink><br /><searchLink fieldCode="DE" term="%22Seismic+reflection+method%22">Seismic reflection method</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+cycles%22">Geological cycles</searchLink><br /><searchLink fieldCode="DE" term="%22Quantitative+research%22">Quantitative research</searchLink><br /><searchLink fieldCode="DE" term="%22Rifts+%28Geology%29%22">Rifts (Geology)</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Libya%22">Libya</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Kotla Graben remains a poorly investigated region. Understanding the architecture of the graben and adjacent basement highs through time is critical for resolving due to the impacts of transitional accelerated subsidence to thermal sagging and basin-bounding fault reactivation mechanisms that create such a graben. This study attempts to restore the Late Cretaceous-Middle Eocene geometry of the Central Kotla Graben, using a combination of well data from 47 boreholes and twenty-six 2D seismic reflection profiles, nine of which are selected to show examples of the new information on the present-day architecture of the deeply buried graben. This geological and geophysical integration has enabled many variables to be involved in backstripping and lithospheric stretching calculations. The shape of backstripped subsidence curves reveals four discrete tectonic (I–IV) phases of subsidence-uplift that are recognised with variable rates and separated by three different types of unconformities. The rifting initiated during the Cenomanian, and both highs were uplifted during the Santonian. The rifting peaked during the Palaeocene and was terminated by a thermal sagging phase during the Eocene. Seismic interpretation indicates that the acoustic basement is generally characterised by three main intra-basement reflection (IRP) packages, located within the Dahra Platform basement and referred to as the Dahra Shear Zone in this study. However, seismic analysis has also enabled the recognition of four different seismic facies units. These facies units are integrated with three recognised gamma-ray log trends to correlate lithological variations within the distinctive boundaries of the tectonic subsidence phases. The tectonic subsidence maps of the graben geometry indicate that during the syn- and post-rift phases, the depocentre of the Central Kotla Graben is located in the south. Two different techniques used to estimate the stretching factor (β): The subsidence-derived stretching revealed lithospheric stretching ranged from 1.0 to 1.5. Moreover, the fault-derived stretching across the Central Kotla Graben ranged from 1.5 to 2, suggesting that the maximum crustal stretching in the graben axis ranges from 50 % to 100 %. This discrepancy is described as "extension discrepancy". • 2D seismic reflection data allow the proper geometry of the deeply buried ancient, elongated graben and adjacent basement highs to be mapped. • Four discrete tectonic phases of various syn-rift, post-rift tectonic evolution and uplift were recognised. • Two different techniques were used to estimate the stretching factor (β). • Three main intra-basement reflection (IRP) packages were recognised. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geodynamics is the property of Elsevier B.V. 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jog.2025.102112 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Grabens (Geology) Type: general – SubjectFull: Land subsidence Type: general – SubjectFull: Seismic reflection method Type: general – SubjectFull: Geological cycles Type: general – SubjectFull: Quantitative research Type: general – SubjectFull: Rifts (Geology) Type: general – SubjectFull: Libya Type: general Titles: – TitleFull: Quantitative modelling of multiphase tectonic subsidence mechanism and lithospheric stretching controls on the evolution of the Central Kotla Graben, Sirt Basin, Libya. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Gumati, Mohammed.S. – PersonEntity: Name: NameFull: Redfern, J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 02643707 Numbering: – Type: volume Value: 165 Titles: – TitleFull: Journal of Geodynamics Type: main |
| ResultId | 1 |
