Richard Lisle | Cardiff University (original) (raw)

Papers by Richard Lisle

Research paper thumbnail of Recumbent folds: Key structural elements in orogenic belts

Earth-Science Reviews

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Research paper thumbnail of StrainModeler: A Mathematica™ −based program for 3D analysis of finite and progressive strain

Computers & Geosciences, 2015

ABSTRACT StrainModeler is a program constructed in the Mathematica™ environment that performs 3D ... more ABSTRACT StrainModeler is a program constructed in the Mathematica™ environment that performs 3D progressive strain calculations for lines and planes undergoing any sequence of homogeneous deformations. The main inputs to the system define the initial line or plane to be deformed and the deformation sequence to be applied, including combinations of simple shear, pure shear and volume change. For the deformation of lines, the output of the program is the change of attitude of the initial line, which can be represented by graphics or plotted in an equal-area projection. For the deformation of planes, the program has several outputs: i) change of attitude of the initial plane; ii) magnitudes and ratio of the semi-axes of the strain ellipse on the deformed plane; iii) orientation of the major and minor axes of the strain ellipse on the deformed plane; iv) orientations of the axial planes of the folds formed on the deformed plane, and v) area change on the deformed plane. The variation of any of these parameters can be shown against a linear parameter only linked to the number of steps involved in the deformation, as a kind of “time” line, or it can be shown against the variation of a parameter of the strain ellipsoid (e. g.: major axis/minor axis ratio). A sequence of directions can be also visualized as a curve in an equal-area plot. Three applications of the program are presented. In the first, the deformation by simple shear of a plane with any orientation is analyzed. In the second, we explore the formation of recumbent folds in layers with different initial orientations for simple shear and pure shear deformations. In the third, we use StrainModeler to analyze the deformation of a set of folds located in a ductile shear zone in the Variscan Belt of NW Spain.

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Research paper thumbnail of A methodology for structural analysis of seismic folds

SEG Technical Program Expanded Abstracts 2008, 2008

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Research paper thumbnail of The Statistical Analysis of Orthogonal Orientation Data

The Journal of Geology, 1989

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Research paper thumbnail of A New Approach for Paleostress Analysis from Kink Bands: Application of Fault‐Slip Methods

The Journal of Geology, 1999

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Research paper thumbnail of Volumetric strains in neutral surface folding

Terra Nova

Abstract Neutral surface folding is a significant contributor to fold development. This mechanism... more Abstract Neutral surface folding is a significant contributor to fold development. This mechanism produces contrasting strains in the inner and outer arcs of the folded layer that arise from principal stress orientations that are approximately parallel and perpendicular to the layer. We demonstrate that such stress patterns imply significant gradients of mean stress across the folding layer, being more tensional on the outer arc and more compressive in the inner arc. This could pump fluids towards the outer arc during folding and result in heterogeneous volume changes. We conclude that the neutral surface folding model should be adapted to accommodate volumetric strains, in order to explain dilatational structures (e.g. open fractures, veining) on the extrados and volume-loss structures (e.g. pressure solution seams, stylolitic cleavages) on the intrados. This dilatation has economic implications as it allows prediction of sites of mineralization and zones of secondary permeability ...

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Research paper thumbnail of Vorticity decomposition and its application to sectional flow characterization: Comment

Tectonophysics, 2000

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Research paper thumbnail of Regional trends in the geology of the Aappalachian-Caledonian-Hercynian-Mauritanide Orogen

Tectonophysics, 1986

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Research paper thumbnail of The evaluation of Laxfordian deformation in the carloway area, Isle of Lewis, Scotland

Tectonophysics, 1977

ABSTRACT

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Research paper thumbnail of Least-squares fitting of the linear Mohr envelope

Quarterly Journal of Engineering Geology and Hydrogeology, 1982

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Research paper thumbnail of The tectonic evolution of the Lewisian complex in northern Lewis, Outer Hebrides

Proceedings of the Geologists' Association, 1975

ABSTRACT

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Research paper thumbnail of Stereographic Projection Techniques for Geologists and Engineers (Second Edition)

Mathematical Geology, 2005

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Research paper thumbnail of Least squares best-fit circles (with applications to Mohr's diagram)

Mathematical Geology, 1992

Procedures are outlined for the selection of a least squares best-fit circle to data points defin... more Procedures are outlined for the selection of a least squares best-fit circle to data points defined by rectangular Cartesian coordinates. Equations are derived to allow fitting of circles centered on the x-axis as well as off-axis Mohr circles. These procedures are applicable to the estimation of second-order tensors such as stress and strain by means of Mohr's diagram.

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Research paper thumbnail of Separation of multiple stress events by fault striation analysis: an example from Variscan and younger structures at Ogmore, South Wales

Journal of the Geological Society, 1996

ABSTRACT The study of minor structures in Carboniferous and Triassic sedimentary rocks at Ogmore-... more ABSTRACT The study of minor structures in Carboniferous and Triassic sedimentary rocks at Ogmore-by-Sea, Bridgend, reveals that the observed microstructures are the consequence of successive brittle deformation events. Age relationships can be deduced from sets of structures consisting of conjugate faults, oblique slip faults, tension gashes and stylolites, from which deductions can be made about the orientations of principal stresses corresponding to pre- and post-Triassic events. The demonstrable polyphase tectonic history at Ogmore and the occurrence of large numbers of striated faults at four sites allow the opportunity of testing a newly proposed strategy for palaeostress analysis from striated faults with complex stress histories. The new technique, based on the statistical procedure of cluster analysis, involves the sorting of fault-slip data into coherent dynamic sets as a preliminary stage of formal stress inversion. The fault sets separated using this technique yield stresses which are similar to those deduced from field observations. Four stress configurations are distinguished, of which two are pre-Triassic in age. Correlations with previously derived stresses are discussed.

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Research paper thumbnail of Simple graphical constructions for the direction of shear

Journal of Structural Geology, 1998

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Research paper thumbnail of A stress inversion procedure for polyphase fault/slip data sets

Journal of Structural Geology, 1995

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Research paper thumbnail of Graphical construction for the direction of shear

Journal of Structural Geology, 2009

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Research paper thumbnail of Photograph of the Month: Flexural slip folding of foresets in cross-bedded sandstones

Journal of Structural Geology, 2010

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Research paper thumbnail of Rapid analysis of fold shape using Bézier curves

Journal of Structural Geology, 2004

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Research paper thumbnail of Report on a meeting of the tectonic studies group on paleostresses and fault systems

Journal of Structural Geology, 1987

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Research paper thumbnail of Recumbent folds: Key structural elements in orogenic belts

Earth-Science Reviews

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Research paper thumbnail of StrainModeler: A Mathematica™ −based program for 3D analysis of finite and progressive strain

Computers & Geosciences, 2015

ABSTRACT StrainModeler is a program constructed in the Mathematica™ environment that performs 3D ... more ABSTRACT StrainModeler is a program constructed in the Mathematica™ environment that performs 3D progressive strain calculations for lines and planes undergoing any sequence of homogeneous deformations. The main inputs to the system define the initial line or plane to be deformed and the deformation sequence to be applied, including combinations of simple shear, pure shear and volume change. For the deformation of lines, the output of the program is the change of attitude of the initial line, which can be represented by graphics or plotted in an equal-area projection. For the deformation of planes, the program has several outputs: i) change of attitude of the initial plane; ii) magnitudes and ratio of the semi-axes of the strain ellipse on the deformed plane; iii) orientation of the major and minor axes of the strain ellipse on the deformed plane; iv) orientations of the axial planes of the folds formed on the deformed plane, and v) area change on the deformed plane. The variation of any of these parameters can be shown against a linear parameter only linked to the number of steps involved in the deformation, as a kind of “time” line, or it can be shown against the variation of a parameter of the strain ellipsoid (e. g.: major axis/minor axis ratio). A sequence of directions can be also visualized as a curve in an equal-area plot. Three applications of the program are presented. In the first, the deformation by simple shear of a plane with any orientation is analyzed. In the second, we explore the formation of recumbent folds in layers with different initial orientations for simple shear and pure shear deformations. In the third, we use StrainModeler to analyze the deformation of a set of folds located in a ductile shear zone in the Variscan Belt of NW Spain.

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Research paper thumbnail of A methodology for structural analysis of seismic folds

SEG Technical Program Expanded Abstracts 2008, 2008

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Research paper thumbnail of The Statistical Analysis of Orthogonal Orientation Data

The Journal of Geology, 1989

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A New Approach for Paleostress Analysis from Kink Bands: Application of Fault‐Slip Methods

The Journal of Geology, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Volumetric strains in neutral surface folding

Terra Nova

Abstract Neutral surface folding is a significant contributor to fold development. This mechanism... more Abstract Neutral surface folding is a significant contributor to fold development. This mechanism produces contrasting strains in the inner and outer arcs of the folded layer that arise from principal stress orientations that are approximately parallel and perpendicular to the layer. We demonstrate that such stress patterns imply significant gradients of mean stress across the folding layer, being more tensional on the outer arc and more compressive in the inner arc. This could pump fluids towards the outer arc during folding and result in heterogeneous volume changes. We conclude that the neutral surface folding model should be adapted to accommodate volumetric strains, in order to explain dilatational structures (e.g. open fractures, veining) on the extrados and volume-loss structures (e.g. pressure solution seams, stylolitic cleavages) on the intrados. This dilatation has economic implications as it allows prediction of sites of mineralization and zones of secondary permeability ...

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Research paper thumbnail of Vorticity decomposition and its application to sectional flow characterization: Comment

Tectonophysics, 2000

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Research paper thumbnail of Regional trends in the geology of the Aappalachian-Caledonian-Hercynian-Mauritanide Orogen

Tectonophysics, 1986

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The evaluation of Laxfordian deformation in the carloway area, Isle of Lewis, Scotland

Tectonophysics, 1977

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Least-squares fitting of the linear Mohr envelope

Quarterly Journal of Engineering Geology and Hydrogeology, 1982

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The tectonic evolution of the Lewisian complex in northern Lewis, Outer Hebrides

Proceedings of the Geologists' Association, 1975

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stereographic Projection Techniques for Geologists and Engineers (Second Edition)

Mathematical Geology, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Least squares best-fit circles (with applications to Mohr's diagram)

Mathematical Geology, 1992

Procedures are outlined for the selection of a least squares best-fit circle to data points defin... more Procedures are outlined for the selection of a least squares best-fit circle to data points defined by rectangular Cartesian coordinates. Equations are derived to allow fitting of circles centered on the x-axis as well as off-axis Mohr circles. These procedures are applicable to the estimation of second-order tensors such as stress and strain by means of Mohr's diagram.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Separation of multiple stress events by fault striation analysis: an example from Variscan and younger structures at Ogmore, South Wales

Journal of the Geological Society, 1996

ABSTRACT The study of minor structures in Carboniferous and Triassic sedimentary rocks at Ogmore-... more ABSTRACT The study of minor structures in Carboniferous and Triassic sedimentary rocks at Ogmore-by-Sea, Bridgend, reveals that the observed microstructures are the consequence of successive brittle deformation events. Age relationships can be deduced from sets of structures consisting of conjugate faults, oblique slip faults, tension gashes and stylolites, from which deductions can be made about the orientations of principal stresses corresponding to pre- and post-Triassic events. The demonstrable polyphase tectonic history at Ogmore and the occurrence of large numbers of striated faults at four sites allow the opportunity of testing a newly proposed strategy for palaeostress analysis from striated faults with complex stress histories. The new technique, based on the statistical procedure of cluster analysis, involves the sorting of fault-slip data into coherent dynamic sets as a preliminary stage of formal stress inversion. The fault sets separated using this technique yield stresses which are similar to those deduced from field observations. Four stress configurations are distinguished, of which two are pre-Triassic in age. Correlations with previously derived stresses are discussed.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Simple graphical constructions for the direction of shear

Journal of Structural Geology, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A stress inversion procedure for polyphase fault/slip data sets

Journal of Structural Geology, 1995

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Graphical construction for the direction of shear

Journal of Structural Geology, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Photograph of the Month: Flexural slip folding of foresets in cross-bedded sandstones

Journal of Structural Geology, 2010

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Research paper thumbnail of Rapid analysis of fold shape using Bézier curves

Journal of Structural Geology, 2004

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Research paper thumbnail of Report on a meeting of the tectonic studies group on paleostresses and fault systems

Journal of Structural Geology, 1987

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