The development of sheath folds in viscously stratified materials in simple shear conditions: An analogue approach.
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| Title: | The development of sheath folds in viscously stratified materials in simple shear conditions: An analogue approach. |
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| Authors: | Dell'Ertole, Damiano1 Damiano.DellErtole@monash.edu, Schellart, Wouter P.1 |
| Source: | Journal of Structural Geology. Nov2013, Vol. 56, p129-141. 13p. |
| Subjects: | Sheath folds (Geology), Stratified flow, Shear (Mechanics), Geologic faults, Viscous flow, Deflection (Mechanics) |
| Abstract: | Abstract: Sheath folds are highly non-cylindrical folds occurring in a variety of geological settings, and have been studied using different approaches. With the present work, we provide a quantitative analysis of the generation and development of sheath folds in a viscously layered system in simple shear conditions. The sheath folds develop from an initial non-cylindrical deflection located on the highly viscous layer. The analogue experiments investigated the influence of (1) variations in the viscosity ratio between the high viscosity layer and the matrix (η hvl/η m ), (2) variations in the ratio between the amplitude of the initial deflection and the thickness of the high viscosity layer (A f /T hvl), and (3) progressive simple shear (γ). The results show that increases in η hvl/η m will produce progressively less elongated sheath folds, while increases in A f /T hvl will result in more elongated sheath folds. We present regime diagrams with η hvl/η m and A f /T hvl for different shear strains illustrating under which conditions sheath folds form. In case the original deflection amplitude and layer thickness as well as γ can be retrieved for sheath folds in nature, then their geometry can be used to quantify the effective η hvl/η m . [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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 91738351 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The development of sheath folds in viscously stratified materials in simple shear conditions: An analogue approach. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Dell'Ertole%2C+Damiano%22">Dell'Ertole, Damiano</searchLink><relatesTo>1</relatesTo><i> Damiano.DellErtole@monash.edu</i><br /><searchLink fieldCode="AR" term="%22Schellart%2C+Wouter+P%2E%22">Schellart, Wouter P.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Structural+Geology%22">Journal of Structural Geology</searchLink>. Nov2013, Vol. 56, p129-141. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Sheath+folds+%28Geology%29%22">Sheath folds (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Stratified+flow%22">Stratified flow</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+%28Mechanics%29%22">Shear (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Geologic+faults%22">Geologic faults</searchLink><br /><searchLink fieldCode="DE" term="%22Viscous+flow%22">Viscous flow</searchLink><br /><searchLink fieldCode="DE" term="%22Deflection+%28Mechanics%29%22">Deflection (Mechanics)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Sheath folds are highly non-cylindrical folds occurring in a variety of geological settings, and have been studied using different approaches. With the present work, we provide a quantitative analysis of the generation and development of sheath folds in a viscously layered system in simple shear conditions. The sheath folds develop from an initial non-cylindrical deflection located on the highly viscous layer. The analogue experiments investigated the influence of (1) variations in the viscosity ratio between the high viscosity layer and the matrix (η hvl/η m ), (2) variations in the ratio between the amplitude of the initial deflection and the thickness of the high viscosity layer (A f /T hvl), and (3) progressive simple shear (γ). The results show that increases in η hvl/η m will produce progressively less elongated sheath folds, while increases in A f /T hvl will result in more elongated sheath folds. We present regime diagrams with η hvl/η m and A f /T hvl for different shear strains illustrating under which conditions sheath folds form. In case the original deflection amplitude and layer thickness as well as γ can be retrieved for sheath folds in nature, then their geometry can be used to quantify the effective η hvl/η m . [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: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jsg.2013.09.002 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 129 Subjects: – SubjectFull: Sheath folds (Geology) Type: general – SubjectFull: Stratified flow Type: general – SubjectFull: Shear (Mechanics) Type: general – SubjectFull: Geologic faults Type: general – SubjectFull: Viscous flow Type: general – SubjectFull: Deflection (Mechanics) Type: general Titles: – TitleFull: The development of sheath folds in viscously stratified materials in simple shear conditions: An analogue approach. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Dell'Ertole, Damiano – PersonEntity: Name: NameFull: Schellart, Wouter P. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2013 Type: published Y: 2013 Identifiers: – Type: issn-print Value: 01918141 Numbering: – Type: volume Value: 56 Titles: – TitleFull: Journal of Structural Geology Type: main |
| ResultId | 1 |
