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Paleo-depth of fossil faults estimated from paleostress state: Applications from the Alps and the Apennines (Italy).

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Title: Paleo-depth of fossil faults estimated from paleostress state: Applications from the Alps and the Apennines (Italy).
Authors: Federico, Laura1 (AUTHOR) laura.federico@unige.it, Maino, Matteo2,3 (AUTHOR) matteo.maino@unipv.it, Capponi, Giovanni1 (AUTHOR) capponig@gmail.com, Crispini, Laura1 (AUTHOR) laura.crispini@unige.it
Source: Journal of Structural Geology. Nov2020, Vol. 140, pN.PAG-N.PAG. 1p.
Subjects: Strains & stresses (Mechanics), Geologic faults, Fossils, Dihedral angles, Geological modeling, Point cloud, Friction
Geographic Terms: Alps, Italy
Abstract: Estimating the paleo-depth of a fossil fault usually requires the application of complex and highly specialized techniques. We propose a new method, that is based mainly on field data and simplifies the process: - calculation of the reduced stress tensor (with four variables) through inversion of fault-slip data; - calculation of the complete stress tensor (i.e., the two remaining unknowns) using the friction and the rupture laws; - estimation of the paleo-depth. The friction law is defined by the lower boundary of the cloud of points in the Mohr space represented by inherited faults. This operation fixes the abscissa origin of the Mohr diagram. To calculate the rupture law, we estimate both intact rock and outcrop quality parameters and need pairs of conjugate faults. Their dihedral angle fixes a point on the Mohr circle, where the rupture law has to be tangent, thus defining the scale of the axes and the values of the principal stresses. To define the paleo-depth, we estimate the average density of overlying rocks and the hydraulic conditions (i.e. the pore pressure).Testing of this workflow in three well-constrained geological case studies proved its promising reliability, showing a good agreement with independent stratigraphic and structural evidence. • This new method can estimate depth of activity of fossil faults from field data. • Fault-slip data, including reactivated faults and conjugate faults are needed. • Paleostress tensors are calculated through inversion of fault-slip data. • The friction and rupture laws are calculated to constrain paleostress values. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Structural Geology is the property of Pergamon Press - An Imprint of Elsevier Science 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: 146952026
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: Paleo-depth of fossil faults estimated from paleostress state: Applications from the Alps and the Apennines (Italy).
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  Data: <searchLink fieldCode="AR" term="%22Federico%2C+Laura%22">Federico, Laura</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> laura.federico@unige.it</i><br /><searchLink fieldCode="AR" term="%22Maino%2C+Matteo%22">Maino, Matteo</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> matteo.maino@unipv.it</i><br /><searchLink fieldCode="AR" term="%22Capponi%2C+Giovanni%22">Capponi, Giovanni</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> capponig@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Crispini%2C+Laura%22">Crispini, Laura</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> laura.crispini@unige.it</i>
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  Data: <searchLink fieldCode="DE" term="%22Alps%22">Alps</searchLink><br /><searchLink fieldCode="DE" term="%22Italy%22">Italy</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Estimating the paleo-depth of a fossil fault usually requires the application of complex and highly specialized techniques. We propose a new method, that is based mainly on field data and simplifies the process: - calculation of the reduced stress tensor (with four variables) through inversion of fault-slip data; - calculation of the complete stress tensor (i.e., the two remaining unknowns) using the friction and the rupture laws; - estimation of the paleo-depth. The friction law is defined by the lower boundary of the cloud of points in the Mohr space represented by inherited faults. This operation fixes the abscissa origin of the Mohr diagram. To calculate the rupture law, we estimate both intact rock and outcrop quality parameters and need pairs of conjugate faults. Their dihedral angle fixes a point on the Mohr circle, where the rupture law has to be tangent, thus defining the scale of the axes and the values of the principal stresses. To define the paleo-depth, we estimate the average density of overlying rocks and the hydraulic conditions (i.e. the pore pressure).Testing of this workflow in three well-constrained geological case studies proved its promising reliability, showing a good agreement with independent stratigraphic and structural evidence. • This new method can estimate depth of activity of fossil faults from field data. • Fault-slip data, including reactivated faults and conjugate faults are needed. • Paleostress tensors are calculated through inversion of fault-slip data. • The friction and rupture laws are calculated to constrain paleostress values. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Structural Geology is the property of Pergamon Press - An Imprint of Elsevier Science 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.jsg.2020.104152
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Geologic faults
        Type: general
      – SubjectFull: Fossils
        Type: general
      – SubjectFull: Dihedral angles
        Type: general
      – SubjectFull: Geological modeling
        Type: general
      – SubjectFull: Point cloud
        Type: general
      – SubjectFull: Friction
        Type: general
      – SubjectFull: Alps
        Type: general
      – SubjectFull: Italy
        Type: general
    Titles:
      – TitleFull: Paleo-depth of fossil faults estimated from paleostress state: Applications from the Alps and the Apennines (Italy).
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Federico, Laura
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            NameFull: Maino, Matteo
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            NameFull: Capponi, Giovanni
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            NameFull: Crispini, Laura
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          Dates:
            – D: 01
              M: 11
              Text: Nov2020
              Type: published
              Y: 2020
          Identifiers:
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              Value: 01918141
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              Value: 140
          Titles:
            – TitleFull: Journal of Structural Geology
              Type: main
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