Fold morphology and some geometrical implications of theories of fold development

Hudleston, Peter J.

doi:10.1016/0040-1951(73)90129-7

Cited by 231 publications

(69 citation statements)

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“…7c). These folds are comparable with fold 14 types 2D and 2E of Hudleston (1973). Locally, less asymmetric 15 folds are observed (e.g.…”

supporting

confidence: 64%

“…outcrop 4), with two moderately dipping 16 limbs and steeply north-dipping to subvertical axial surfaces. 17 These folds, comparable with fold type 2C of Hudleston (1973), 18 are usually better rounded than the stepfolds. In the stepfolds, 19 cleavage usually dips to the north in both limbs, compatible with 20 the generally north-dipping cleavage in the northern outcrops.…”

mentioning

confidence: 96%

“…Some pre-cleavage folds have fold shapes 31 comparable with those of the syn-cleavage folds. Others, how-32 ever, have different fold geometries, resembling types 1C, 1D, 33 2F, 3C and 3D of Hudleston (1973).…”

mentioning

confidence: 99%

“…The syn-cleavage stepfold-like antiform, comparable with fold type 2D of Hudleston (1973), has a welldeveloped divergent cleavage fan, symmetrical about the fold hinge. In contrast, the small folds in its southern limb have an axial surface that is cut by the cleavage and hence have a pre-cleavage origin.…”

mentioning

confidence: 99%

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Influence of slump folds on tectonic folds: an example from the Lower Ordovician of the Anglo-Brabant Deformation Belt (Belgium)

Beckers

Debacker

2006

JGS

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7 Abstract: Although it is generally accepted that buckle folds will not develop in a perfectly planar layer 8 without the presence of some irregularity or perturbation at which the folds initiate, there are very few cases 9 in which individual natural folds can be linked to specific irregularities. Within the Lower Ordovician Abbaye 10 de Villers Formation, Anglo-Brabant Deformation Belt, metre-scale tectonic folds occur, of which the position 11 and, to a certain extent, the geometry appear to be controlled by slump folds and related features. The metre-12 scale tectonic folds, interpreted as parasitic structures on the limb of a large-scale host fold, occur only within 13 a stratigraphic level affected by slumping. In this level, tectonic antiforms tend to form superimposed on 14 antiformal slump folds and on zones of abrupt, slump-related thickness increase, and tectonic synforms on 15 synformal slump folds and on zones of abrupt thickness decrease. The rather irregular 3D geometry of 16 sedimentary sequences suggests that many more similar cases should exist in which folds can be linked to 17 specific irregularities. However, possibly it is also this abundance of irregularities in sedimentary sequences, 18 in combination with fold and outcrop scale, that makes it difficult to attribute a particular fold to a particular 19 perturbation.20 Keywords: Brabant Massif, cleavage, folds, slump structures.21 One of the most intriguing questions in structural geology is 22 why particular structures form at particular localities. In the 23 case of folding, theories and experiments have shown that 24 buckle folds will not develop in a perfectly planar layer without 25 the presence of some irregularity or perturbation at which the 26 folds initiate

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“…7c). These folds are comparable with fold 14 types 2D and 2E of Hudleston (1973). Locally, less asymmetric 15 folds are observed (e.g.…”

supporting

confidence: 64%

mentioning

confidence: 96%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Influence of slump folds on tectonic folds: an example from the Lower Ordovician of the Anglo-Brabant Deformation Belt (Belgium)

Beckers

Debacker

2006

JGS

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“…En las cuarzowacas al microscopio se observan fantasmas redondeados de los granos detríticos de cuarzo. En las calizas negras la morfología de los pliegues en cortes perpendiculares a L I pertenece a la clase 1e de Ramsay (1967), con aplastamientos medios deducidos por el método de Huddleston (1973) de R..=2,5. El ángulo medio entre los flancos es de unos 200.…”

Section: Descripción De Las Estructurasunclassified

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Jabaloy¹,

Lodeiro²

1988

Estud. geol.

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RESUMENEn el complejo Nevado-Filábride, en el sector occidental de la Sierra de Filabres, se distinguen tres unidades superpuestas tectónicamente. La estructura interna de las unidades corresponde a grandes pliegues con desarrollo de flancos inversos importantes. Esta estructura interna se debe a la actuación de tres importantes fases de deformación, que originan estructuras menores más o menos penetrativas. Las primera fase de deformación DI genera un <

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References

2016

A Field Guide to the Carboniferous Sediments of the Shannon Basin, Western Ireland

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Fold morphology and some geometrical implications of theories of fold development

Cited by 231 publications

References 50 publications

Influence of slump folds on tectonic folds: an example from the Lower Ordovician of the Anglo-Brabant Deformation Belt (Belgium)

Influence of slump folds on tectonic folds: an example from the Lower Ordovician of the Anglo-Brabant Deformation Belt (Belgium)

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