Instability structures, synsedimentary faults and turbidites, witnesses of a Liassic seismotectonic activity in the Dauphiné Zone (French Alps): A case example in the Lower Pliensbachian at Saint-Michel-en-Beaumont

Bergerat, Françoise; Collin, Pierre‐Yves; Ganzhorn, Anne-Céline; Baudin, François; Galbrun, Bruno; Rouget, Isabelle; Schnyder, Johann

doi:10.1016/j.jog.2010.10.003

Cited by 11 publications

(4 citation statements)

References 110 publications

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“…Particularly noticeable are the faults making the Ardèche margin in the west ( fig. 1) and large tilted blocks in the external Alps bounded by normal faults like the "Accident médian de Belledonne" and the Ornon fault with a present-day throw up to 2000 m [Gidon and Aprahamian, 1980;Lemoine et al, 1981;Barféty and Gidon, 1983;Bergerat et al, 2011]. The fault network shows a main NE-SW trend indicating that the Liassic rifting corresponds roughly to a NW-SE extension.…”

Section: Overall History and Sedimentary Infillingmentioning

confidence: 99%

Late Jurassic-Early Cretaceous faulting in the Southeastern French basin: does it reflect a tectonic reorganization?

Homberg

Schnyder

Benzaggagh

2013

Bulletin De La Société Géologique De France

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We present new data constraining the Late Jurassic to Early Cretaceous evolution of the Southeastern French basin (SFB). Meso-scale faults with displacement of several decimeters to 1-2 meters were sampled for geometric and kinematic data analysis and the faulted and un-faulted sedimentary units were examined for sedimentologic and bio-stratigraphic purposes. Small-scale faults were also extensively collected to determine the local stress states during this period. Meso-scale normal faults formed during sediment deposition or before its complete lithification attest of a recurrent activity in the Late Jurassic to Early Cretaceous period in an overall extensional context. The fault network cutting the Oxfordian to Aptian sequences included normal faults of various trends, ranging between WSW-ENE and NNW-SSE. We show that the deformation mechanism in the SFB drastically changed in the Jurassic-Cretaceous transition (latermost Tithonian?), with the direction of extension rotating from a WNW-ESE to a NNE-SSW direction. Lateral thickness variation of the sequences, redistribution of sediments, faulting at various scales concur that the Early Cretaceous period marks a tectono-stratigraphic reorganization of the basin. We suggest that it traduces the rifting and later opening of the North Atlantic (main branch and bay of Biscay branch). La fracturation au cours du Jurassique supérieur et Crétacé inférieur dans le bassin du Sud-Est reflète-t-elle une ré-organisation tectonique ?Mots-clés. -Bassin du Sud-Est, Failles, Rift, Jurassique supérieur, Crétacé inférieur, Vocontien.Résumé. -Nous présentons des données nouvelles dans le bassin du Sud-Est (France) qui nous permettent de discuter l'évolution de ce bassin au cours de la période allant du Jurassique supérieur au Crétacé inférieur. Les attributs géomé-triques et cinématiques de failles à rejet décimétrique à métrique sont examinés ainsi que les caractéristiques sédimen-taires des séries affectées et scellant ces structures. Un examen du contenu micropaléontologique renseigne l'âge de ces unités. Les états de contraintes locaux sont obtenus à partir de l'inversion de failles de petite dimension collectées de manière extensive dans la région. Des failles normales actives pendant la sédimentation ou avant la lithification complète des sédiments attestent d'une activité pérenne en contexte extensif pendant le Jurassique supérieur et le Crétacé inférieur. Le réseau de fractures affectant les séries oxfordiennes à aptienne comporte des failles normales aux directions hétérogènes, variant de WSW-ENE à NNW-SSE. Nous montrons que le mécanisme de la déformation change drastiquement à la transition Jurassique-Crétacé (Tithonien terminal?) avec une direction d'extension évoluant de WNW-ESE à NNE-SSW. Les variations d'épaisseur des dépôts, les vallées sous-marines redistribuant les sédiments, la fracturation à toute échelle traduisent la même signature d'une ré-organisation tectono-sédimentaire du bassin. Cette dernière se fait l'écho du rifting et de l'océanisation dans l'Atlantiq...

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Section: Overall History and Sedimentary Infillingmentioning

confidence: 99%

Late Jurassic-Early Cretaceous faulting in the Southeastern French basin: does it reflect a tectonic reorganization?

Homberg

Schnyder

Benzaggagh

2013

Bulletin De La Société Géologique De France

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“…In this case, thickness variation of the pre-orogenic succession can be an indicator of synsedimentary normal faulting. The most characteristic fault-related sediments are coarse-grained talus-cone breccias (Ortner et al 2008); moreover, synsedimentary fault movements are often associated with soft-sediment deformation (Bergerat et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Evidences for pre-orogenic passive-margin extension in a Cretaceous fold-and-thrust belt on the basis of combined seismic and field data (western Transdanubian Range, Hungary)

Héja

Kövér

Csillag

et al. 2018

Int J Earth Sci (Geol Rundsch)

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Combined sedimentological and structural analysis was carried out in the field and on 2D seismic reflection profiles to recognize pre-orogenic structures in a Cretaceous fold-and-thrust belt. Detailed field observations were made in the Keszthely Hills, Western Hungary, while 2D seismic interpretation was carried out in the neighbouring Zala Basin. As a result, a fault-controlled intraplatform basin system was identified by a detailed analysis of bounding faults, and related outcropscale structures. The Norian-Rhaetian (227-201.3 Ma) synsedimentary faulting was associated with talus breccia formation, small-scale faulting, and dyke formation, in addition to slumping and other soft-sediment deformations. Based on the distribution of talus breccia, WNW-ESE-trending map-scale normal faults were identified in the Keszthely Hills, which is in agreement with the directly observed outcrop-scale synsedimentary faults. On seismic sections, similar WNW-or NWtrending Late Triassic normal faults were identified based on thickness variations of the syn-rift sediments and the presence of wedge-shaped bodies of talus breccia. Normal faulting occurred already in the Norian, and extensional tectonics was active through the Early and Middle Jurassic. The Late Triassic grabens of the western Transdanubian Range could be correlated with those in western part of the Southern Alps, and the Bajuvaric nappe system of the Northern Calcareous Alps. These grabens were situated on the proximal Adriatic margin, and they represent the first sign of the Alpine Tethys rifting. The locus of extension was laterally migrated westward, towards the distal Adriatic margin during Early and Middle Jurassic.

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“…Soft sediment deformations (SSDs) are observed in almost all types of environments, from alluvial fan and fluvial systems (Plaziat, 1998); shallow marine and tidal (Pope et al, 1997;Schnyder et al, Laborde et al Soft Sediment Deformations in the UK 2005;Greb and Archer, 2007;Ghosh et al, 2012); lacustrine (Marco et al, 1996;Ken-Tor et al, 2001) and deep marine -turbidite environments (Allen, 1977;Bergerat et al, 2011;Homberg et al, 2013;Basilone et al, 2015). These deformations include convolute bedding, overturned cross-stratification, load structures or water escape features.…”

Section: Introductionmentioning

confidence: 99%

“…(5) The superposition of SSD levels in the sedimentary pile which may correspond to a succession of seismic events. This criterion is especially strong when it is possible to link the deformed levels to historical earthquakes (Marco et al, 1996;Ken-Tor et al, 2001), (6) A sedimentary and tectonic context consistent with the occurrence of frequent earthquakes (Bergerat et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Do soft sediment deformations in the Late Triassic and Early Jurassic of the UK record seismic activity during the break-up of Pangea?

Laborde-Casadaban

Homberg

Schnyder

et al. 2021

Proceedings of the Geologists' Association

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Instability structures, synsedimentary faults and turbidites, witnesses of a Liassic seismotectonic activity in the Dauphiné Zone (French Alps): A case example in the Lower Pliensbachian at Saint-Michel-en-Beaumont

Cited by 11 publications

References 110 publications

Late Jurassic-Early Cretaceous faulting in the Southeastern French basin: does it reflect a tectonic reorganization?

Late Jurassic-Early Cretaceous faulting in the Southeastern French basin: does it reflect a tectonic reorganization?

Evidences for pre-orogenic passive-margin extension in a Cretaceous fold-and-thrust belt on the basis of combined seismic and field data (western Transdanubian Range, Hungary)

Do soft sediment deformations in the Late Triassic and Early Jurassic of the UK record seismic activity during the break-up of Pangea?

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