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Interaction of flexural shear, S–C fabrics, and oblique shear during folding of micaceous quartzite

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Title: Interaction of flexural shear, S–C fabrics, and oblique shear during folding of micaceous quartzite
Authors: Hippertt, J.1 hippertt@degeo.ufop.br, Tohver, E.2
Source: Journal of Structural Geology. Jun2002, Vol. 24 Issue 6/7, p1087. 13p.
Subjects: Outcrops (Geology), Folds (Geology), Shear (Mechanics)
Abstract: This paper investigates the geometry, microstructure, and c-axis fabrics of an outcrop scale, micaceous quartzite fold produced under greenschist facies metamorphic conditions in the Moeda quartzite, Quadrila´tero Ferrı´fero granite–greenstone terrain, southeastern Brazil. The fold limbs show development of opposed S–C fabrics and asymmetric quartz c-axis fabrics compatible with flexural slip along the fold surface. Towards the fold hinge, there is an increasing presence of oblique shear bands (here named S-bands) which gradually change to crenulations within the hinge zone. The oblique S-bands are interpreted to have formed through connection of several S-planes, increasing accommodation of antithetical shear along these S-planes and offset of the initial C-planes at intermediate stages of folding. This mechanism represents a kinematic inversion in the role played by the two sets of foliations in S–C structures. Our observations support flexural slip for early stages of folding. However, with progressive closure of the fold, the flexural slip mechanism involves increasing contributions from oblique shear on the S-bands, thus approximating an intermediate situation between flexural slip and passive folding (shear parallel to the axial plane). [Copyright &y& Elsevier]
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.)
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DbLabel: Engineering Source
An: 7761202
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  Data: Interaction of flexural shear, S–C fabrics, and oblique shear during folding of micaceous quartzite
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  Data: This paper investigates the geometry, microstructure, and c-axis fabrics of an outcrop scale, micaceous quartzite fold produced under greenschist facies metamorphic conditions in the Moeda quartzite, Quadrila´tero Ferrı´fero granite–greenstone terrain, southeastern Brazil. The fold limbs show development of opposed S–C fabrics and asymmetric quartz c-axis fabrics compatible with flexural slip along the fold surface. Towards the fold hinge, there is an increasing presence of oblique shear bands (here named S-bands) which gradually change to crenulations within the hinge zone. The oblique S-bands are interpreted to have formed through connection of several S-planes, increasing accommodation of antithetical shear along these S-planes and offset of the initial C-planes at intermediate stages of folding. This mechanism represents a kinematic inversion in the role played by the two sets of foliations in S–C structures. Our observations support flexural slip for early stages of folding. However, with progressive closure of the fold, the flexural slip mechanism involves increasing contributions from oblique shear on the S-bands, thus approximating an intermediate situation between flexural slip and passive folding (shear parallel to the axial plane). [Copyright &y& Elsevier]
– 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:
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      – Type: doi
        Value: 10.1016/S0191-8141(01)00093-1
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 1087
    Subjects:
      – SubjectFull: Outcrops (Geology)
        Type: general
      – SubjectFull: Folds (Geology)
        Type: general
      – SubjectFull: Shear (Mechanics)
        Type: general
    Titles:
      – TitleFull: Interaction of flexural shear, S–C fabrics, and oblique shear during folding of micaceous quartzite
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            NameFull: Hippertt, J.
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            NameFull: Tohver, E.
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              Text: Jun2002
              Type: published
              Y: 2002
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              Value: 24
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              Value: 6/7
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            – TitleFull: Journal of Structural Geology
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