Anatomy of a km-scale fault zone controlling the Oligo-Miocene bending of the Ligurian Alps (NW Italy): integration of field and 3D high-resolution digital outcrop model data.
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| Title: | Anatomy of a km-scale fault zone controlling the Oligo-Miocene bending of the Ligurian Alps (NW Italy): integration of field and 3D high-resolution digital outcrop model data. |
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| Authors: | Manna, Ludovico1 (AUTHOR) ludovico.manna01@universitadipavia.it, Perozzo, Michele1 (AUTHOR), Menegoni, Niccolò2 (AUTHOR), Tamburelli, Silvia1 (AUTHOR), Crispini, Laura3 (AUTHOR), Federico, Laura3 (AUTHOR), Seno, Silvio1 (AUTHOR), Maino, Matteo1,4 (AUTHOR) |
| Source: | Swiss Journal of Geosciences. 10/4/2023, Vol. 116 Issue 1, p1-29. 29p. |
| Subjects: | Shear zones, Calcite crystals, Breccia, Fault zones, Data modeling, Anatomy, Dolomite |
| Geographic Terms: | Alps |
| Abstract: | We report the first description of a ~ 15 km long NE-SW-striking transtensive fault network crosscutting the metamorphic units of the Ligurian Alps. The main fault zone, hereby named Horse Head Fault Zone, is up to 250 m thick, involves quarzite, metarhyolite, marble and alternation of dolostone and limestone and minor pelite. Relatively narrow (~ 1–3 m-thick) fault cores are characterized by gouge and cataclasites, surrounded by brecciated damage zones as thick as tens to hundreds of meters. Damage zones show widespread evidence for dilation in the form of dilation breccia, large calcite crystals and aggregates, and centimeter- to meter-thick veins. Moreover, the fault zone contains a multitude of polished slip surfaces with multiple sets of slickensides and slickenfibers. Oblique to strike-slip kinematics dominates over the large part of the fault mirrors and both overprint and are overprinted by down-dip slip surfaces. The fault network includes dominant NE-SW right-lateral faults with a minor normal component and NW–SE left-lateral steep faults with a negligible reverse component, consistent with a km-size dextral NE-SW-striking Riedel shear zone, in turn representing an antithetic R' of the regional sinistral shear zone constituted by the Ligurian Alps after the nappe stacking. The Horse Head Fault Zone accommodated km-scale displacement before the Early Miocene, as it is sealed by the sedimentary deposits of the Finale Ligure Basin, thus predating the Corsica-Sardinia drifting. Results of this work constraint the bending of the Ligurian Alps as part of the Western Alpine arc as accomplished through two consecutive, late Oligocene and Early Miocene, stages driven by the combination of Adria rotation and the rollback of the Apennine subduction. [ABSTRACT FROM AUTHOR] |
| Copyright of Swiss Journal of Geosciences is the property of Springer Nature 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: 172778036 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Anatomy of a km-scale fault zone controlling the Oligo-Miocene bending of the Ligurian Alps (NW Italy): integration of field and 3D high-resolution digital outcrop model data. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Manna%2C+Ludovico%22">Manna, Ludovico</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ludovico.manna01@universitadipavia.it</i><br /><searchLink fieldCode="AR" term="%22Perozzo%2C+Michele%22">Perozzo, Michele</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Menegoni%2C+Niccolò%22">Menegoni, Niccolò</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tamburelli%2C+Silvia%22">Tamburelli, Silvia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Crispini%2C+Laura%22">Crispini, Laura</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Federico%2C+Laura%22">Federico, Laura</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Seno%2C+Silvio%22">Seno, Silvio</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Maino%2C+Matteo%22">Maino, Matteo</searchLink><relatesTo>1,4</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Swiss+Journal+of+Geosciences%22">Swiss Journal of Geosciences</searchLink>. 10/4/2023, Vol. 116 Issue 1, p1-29. 29p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Shear+zones%22">Shear zones</searchLink><br /><searchLink fieldCode="DE" term="%22Calcite+crystals%22">Calcite crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Breccia%22">Breccia</searchLink><br /><searchLink fieldCode="DE" term="%22Fault+zones%22">Fault zones</searchLink><br /><searchLink fieldCode="DE" term="%22Data+modeling%22">Data modeling</searchLink><br /><searchLink fieldCode="DE" term="%22Anatomy%22">Anatomy</searchLink><br /><searchLink fieldCode="DE" term="%22Dolomite%22">Dolomite</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Alps%22">Alps</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We report the first description of a ~ 15 km long NE-SW-striking transtensive fault network crosscutting the metamorphic units of the Ligurian Alps. The main fault zone, hereby named Horse Head Fault Zone, is up to 250 m thick, involves quarzite, metarhyolite, marble and alternation of dolostone and limestone and minor pelite. Relatively narrow (~ 1–3 m-thick) fault cores are characterized by gouge and cataclasites, surrounded by brecciated damage zones as thick as tens to hundreds of meters. Damage zones show widespread evidence for dilation in the form of dilation breccia, large calcite crystals and aggregates, and centimeter- to meter-thick veins. Moreover, the fault zone contains a multitude of polished slip surfaces with multiple sets of slickensides and slickenfibers. Oblique to strike-slip kinematics dominates over the large part of the fault mirrors and both overprint and are overprinted by down-dip slip surfaces. The fault network includes dominant NE-SW right-lateral faults with a minor normal component and NW–SE left-lateral steep faults with a negligible reverse component, consistent with a km-size dextral NE-SW-striking Riedel shear zone, in turn representing an antithetic R' of the regional sinistral shear zone constituted by the Ligurian Alps after the nappe stacking. The Horse Head Fault Zone accommodated km-scale displacement before the Early Miocene, as it is sealed by the sedimentary deposits of the Finale Ligure Basin, thus predating the Corsica-Sardinia drifting. Results of this work constraint the bending of the Ligurian Alps as part of the Western Alpine arc as accomplished through two consecutive, late Oligocene and Early Miocene, stages driven by the combination of Adria rotation and the rollback of the Apennine subduction. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Swiss Journal of Geosciences is the property of Springer Nature 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=172778036 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1186/s00015-023-00444-1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 29 StartPage: 1 Subjects: – SubjectFull: Shear zones Type: general – SubjectFull: Calcite crystals Type: general – SubjectFull: Breccia Type: general – SubjectFull: Fault zones Type: general – SubjectFull: Data modeling Type: general – SubjectFull: Anatomy Type: general – SubjectFull: Dolomite Type: general – SubjectFull: Alps Type: general Titles: – TitleFull: Anatomy of a km-scale fault zone controlling the Oligo-Miocene bending of the Ligurian Alps (NW Italy): integration of field and 3D high-resolution digital outcrop model data. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Manna, Ludovico – PersonEntity: Name: NameFull: Perozzo, Michele – PersonEntity: Name: NameFull: Menegoni, Niccolò – PersonEntity: Name: NameFull: Tamburelli, Silvia – PersonEntity: Name: NameFull: Crispini, Laura – PersonEntity: Name: NameFull: Federico, Laura – PersonEntity: Name: NameFull: Seno, Silvio – PersonEntity: Name: NameFull: Maino, Matteo IsPartOfRelationships: – BibEntity: Dates: – D: 04 M: 10 Text: 10/4/2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 16618726 Numbering: – Type: volume Value: 116 – Type: issue Value: 1 Titles: – TitleFull: Swiss Journal of Geosciences Type: main |
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