Hyper-extended crust in the South Atlantic: in search of a model

Unternehr, Patrick; Péron‐Pinvidic, Gwenn; Manatschal, Giänreto; Sutra, Emilie

doi:10.1144/1354-079309-904

Cited by 189 publications

(154 citation statements)

References 25 publications

Supporting

Mentioning

142

Contrasting

Unclassified

Order By: Relevance

“…Syntectonic sedimentation clearly results in a series of oceanward-growing and tilting sedimentary wedges, younging toward the ocean. The observation of CDNF along the Gabon margin is in accordance with previous observations (Ranero & Pérez Gussinyé, 2010;Skogseid, 2014) and numerical models (Brune et al, 2014) but is also in relative contradiction with the description of the West African non-magmatic margins, often represented with thick and wide sag basin (Contrucci et al, 2004;Moulin et al, 2005) that is described as "subsiding vertically without differential tilting" (Aslanian et al, 2009) resting on a "highly thinned, little faulted continental crust" (Unternehr et al, 2010). For us, interpretation of profiles GA1, GA2 and GA3 indicates that most of the sedimentary basins resting on top of the highly thinned continental crust are actually syn-rift and migrate outboard until break up.…”

Section: Iiica Origin Of the Cndfsupporting

confidence: 83%

“…In contrast with the Angola margin, the Gabon margin presents a much thicker syn-rift sedimentary cover, and a thinner sag basin (Lentini et al, 2010;Unternehr et al, 2010, Péron-Pinvidic et al, 2015. We present three profiles shot offshore the Gabonese margin.…”

Section: Iic Gabon Magma-poor Rifted Marginmentioning

confidence: 99%

“…180km wide), underlying a thick sag basin with an apparent lack of deformation (Contrucci et al, 2004;Moulin et al, 2005;Unternehr et al, 2010;Péron-Pinvidic et al, 2015). Whereas other margins such as the Southern Angola or Aden margins appear extremely short (e.g.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

See 2 more Smart Citations

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

et al. 2018

View full text Add to dashboard Cite

, Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust, (2016), doi: 10.1016/j.gr.2017.04.030 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T Abstract:The

show abstract

Section: Iiica Origin Of the Cndfsupporting

confidence: 83%

Section: Iic Gabon Magma-poor Rifted Marginmentioning

confidence: 99%

See 1 more Smart Citation

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The Newfoundland-Iberian margin has been thoroughly studied by different research groups and drilled by DSDP boreholes in key tectonic settings, resulting in a rather constrained crustal architecture model for the area (Discovery Working Group 1998). However, variations of the original conceptual model (as proposed by Boillot et al 1980) have been recently used as a paradigm for the breakup of continents and formation of continental margins (Bowling & Harry 2001;Karner 2008;Unternehr et al 2010;Zalán et al 2011).…”

Section: " "mentioning

confidence: 99%

“…The outermost highs in these basins have not been drilled and alternative interpretations of their origin have been proposed, including volcanic highs, Precambrian horsts, uplifted rifted blocks, and exhumed serpentinized mantle (Lentini et al 2010;Scotchman et al 2010;Unternehr et al 2010;Zalán et al 2011).…”

mentioning

confidence: 99%

Architecture of rifted continental margins and break-up evolution: insights from the South Atlantic, North Atlantic and Red Sea–Gulf of Aden conjugate margins

Mohriak

Leroy

2012

View full text Add to dashboard Cite

To cite this version:Webster Ueipass Mohriak, Sylvie Leroy. Architecture of rifted continental margins and break-up evolution: insights from the South Atlantic, North Atlantic and Red Sea-Gulf of Aden conjugate margins. Special Publication -Geological Society of London, 2012, 369, pp.1-40. <10.1144/SP369.17>. !" " " ARCHITECTURE OF RIFTED CONTINENTAL MARGINS AND BREAKUP EVOLUTION: INSIGHTS FROM THE SOUTH ATLANTIC, NORTH ATLANTIC AND RED SEA -GULF OF ADEN CONJUGATE MARGINS

show abstract

Thermal control on the modes of crustal thinning leading to mantle exhumation: Insights from the Cretaceous Pyrenean hot paleomargins

2014

View full text Add to dashboard Cite

The prerift Mesozoic sequences of the Cretaceous passive margins fossilized in the North Pyrenean Zone (NPZ) are characterized by high-temperature deformation in relation with thinning of the continental basement. Our compilation of chronological and geological data confirms a clear correlation between the distribution of the highest paleotemperatures in the prerift sedimentary cover and the loci of extreme crustal stretching. Geological evidences such as the occurrence of peridotite bodies directly underlying metamorphic prerift sediments indicate an early attenuation of the rifted continental crust. This leads us to propose a mechanism of rifting involving boudinage of the continental crust. The lateral extraction of the Paleozoic basement occurred under the prerift cover that is decoupled on the Triassic clays and evaporites. The thermal conditions allowing coeval ductile deformation of the crust and of the prerift sediments leaded to the widening of basins devoid of large faulted blocks. We discuss the implications on the origin and significance of the granulites and the relations between flysch deposition and high-temperature metamorphism of the prerift sediments. In the NPZ, Albian-Cenomanian flysch sequences were deposited synchronously with the synmetamorphic ductile deformation of the prerift sequences. Since the base of the flysch deposits also recorded locally the high-temperature tectonic event, we propose an original mechanism for the evolution of the basins involving continuous deformation of the prerift metamorphic sediments. At the scale of the Pyrenean domain, our results suggest a strong lateral variability in the tectonic style of passive margins, in direct link with their thermic pattern.

show abstract

Hyper-extended crust in the South Atlantic: in search of a model

Cited by 189 publications

References 25 publications

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

Architecture of rifted continental margins and break-up evolution: insights from the South Atlantic, North Atlantic and Red Sea–Gulf of Aden conjugate margins

Thermal control on the modes of crustal thinning leading to mantle exhumation: Insights from the Cretaceous Pyrenean hot paleomargins

Contact Info

Product

Resources

About