Analogue Modelling of Inverted Oblique Rift Systems
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universitat de Barcelona
2005
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| _version_ | 1876479559048626176 |
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| author | A. Amilibia |
| author_facet | A. Amilibia |
| contents | Analogue Modelling of Inverted Oblique Rift Systems A. Amilibia K.R. McClay F. Sàbat J.A. Muñoz E. Roca Ciencias de la Tierra Atlas Mountains Donbas Fold belt Analogue modelling Tectonic inversion Oblique and offset rifts The geometric evolution of brittle fault systems in inverted oblique and offset rift systems has been simulatedusing scaled sandbox analogue models. Dry fine-grained quartz sand was used to represent the brittle uppercrust. Extensional faults geometries in the models were governed by the geometry and orientation of a stretchingzone at the base of the models. Oblique rift models were characterized by segmented en-echelon borderfault systems trending parallel to the rift axis and the underlying zone of basement stretching. Offset rift modelspromoted highly-segmented border faults as well as offset sub-basins within the rift. In both types of models,intra-rift fault arrays were oriented sub-perpendicular to the extension direction. Inversion of the oblique andoffset extensional models was achieved by horizontal shortening. This resulted in partial inversion of the borderand intra-rift faults as well as the formation of new reverse faults. The geometries, distribution, orientations andnumber of these new reverse faults were strongly controlled by the earlier-formed fault extensional architectures.At the margins of the rift zone, shortening was mainly accommodated by partial inversion of the borderfaults together with the formation of hanging-wall bypass faults and footwall shortcut thrusts. Inversion of theoffset rift models produced reactivation of the extensional accommodation zones as soft-linked transfer zonesbetween new thrust faults. The analogue model results have been compared with natural inversion structures inthe Atlas Mountains of Morocco and the Ukrainian Donbas fold belt. The analogue modelling results suggestthat the High Atlas formed as the result of oblique inversion of an oblique rift system, and the contractionalstructures in the Ukranian Donbas belt were generated by partial inversion of the earlier-formed Donbas extensionalgraben via two major newly developed short-cuts that uplifted and exhumed the basin. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530304 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.3 |
| format | Artículo científico |
| id | redalyc_50530304 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universitat de Barcelona |
| spellingShingle | Analogue Modelling of Inverted Oblique Rift Systems A. Amilibia Ciencias de la Tierra Atlas Mountains Donbas Fold belt Analogue modelling Tectonic inversion Oblique and offset rifts Analogue Modelling of Inverted Oblique Rift Systems A. Amilibia K.R. McClay F. Sàbat J.A. Muñoz E. Roca Ciencias de la Tierra Atlas Mountains Donbas Fold belt Analogue modelling Tectonic inversion Oblique and offset rifts The geometric evolution of brittle fault systems in inverted oblique and offset rift systems has been simulatedusing scaled sandbox analogue models. Dry fine-grained quartz sand was used to represent the brittle uppercrust. Extensional faults geometries in the models were governed by the geometry and orientation of a stretchingzone at the base of the models. Oblique rift models were characterized by segmented en-echelon borderfault systems trending parallel to the rift axis and the underlying zone of basement stretching. Offset rift modelspromoted highly-segmented border faults as well as offset sub-basins within the rift. In both types of models,intra-rift fault arrays were oriented sub-perpendicular to the extension direction. Inversion of the oblique andoffset extensional models was achieved by horizontal shortening. This resulted in partial inversion of the borderand intra-rift faults as well as the formation of new reverse faults. The geometries, distribution, orientations andnumber of these new reverse faults were strongly controlled by the earlier-formed fault extensional architectures.At the margins of the rift zone, shortening was mainly accommodated by partial inversion of the borderfaults together with the formation of hanging-wall bypass faults and footwall shortcut thrusts. Inversion of theoffset rift models produced reactivation of the extensional accommodation zones as soft-linked transfer zonesbetween new thrust faults. The analogue model results have been compared with natural inversion structures inthe Atlas Mountains of Morocco and the Ukrainian Donbas fold belt. The analogue modelling results suggestthat the High Atlas formed as the result of oblique inversion of an oblique rift system, and the contractionalstructures in the Ukranian Donbas belt were generated by partial inversion of the earlier-formed Donbas extensionalgraben via two major newly developed short-cuts that uplifted and exhumed the basin. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530304 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.3 |
| title | Analogue Modelling of Inverted Oblique Rift Systems |
| topic | Ciencias de la Tierra Atlas Mountains Donbas Fold belt Analogue modelling Tectonic inversion Oblique and offset rifts |
| url | https://www.redalyc.org/articulo.oa?id=50530304 |