The breakup sequence and associated lithospheric breakup surface: Their significance in the context of rifted continental margins (West Iberia and Newfoundland margins, North Atlantic)

Soares, Duarte Miguel; Alves, Tiago Marcos; Terrinha, Pedro

doi:10.1016/j.epsl.2012.08.036

Cited by 114 publications

(125 citation statements)

References 72 publications

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“…In addition, its relative impermeability due to high clay content must have consistently limited the penetration of basinal and meteoric water in the system, hence annihilating convective cooling . In contrast with the starved paleotethys margin (Manatschal and Bernoulli, 1999;Manatschal, 2004;Masini et al, 2012) and Iberian margin (Shipboard Scientific Party, 1987;Manatschal and Bernoulli, 1999;Soares et al, 2012), the Pyrenean paleomargin seems to have developed in a sedimentrich environment, favorable to a marked blanketing effect.…”

Section: Evaporite-enhanced Thermal Conduction Vs Blanketing Effectmentioning

confidence: 94%

High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

et al. 2015

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Abstract. An increasing number of field examples in mountain belts show that the formation of passive margins during extreme continent thinning may occur under conditions of high to very high thermal gradient beneath a thin cover of syn-rift sediments. Orogenic belts resulting from the tectonic inversion of distal margins and regions of exhumed continental mantle may exhibit high-temperature, low-pressure (HT-LP) metamorphism and coeval syn-extensional, ductile deformation. Recent studies have shown that the northern flank of the Pyrenean belt, especially the North Pyrenean Zone, is one of the best examples of such inverted hot, passive margin. In this study, we provide a map of HT-LP metamorphism based on a data set of more than 100 peak-temperature estimates obtained using Raman spectroscopy of the carbonaceous material (RSCM). This data set is completed by previous PT (pressure and temperature) estimates based on mineral assemblages, and new 40 Ar-39 Ar (amphibole, micas) and U-Pb (titanite) ages from metamorphic and magmatic rocks of the North Pyrenean Zone. The implications on the geological evolution of the Cretaceous Pyrenean paleomargins are discussed. Ages range mainly from 110 to 90 Ma, and no westward or eastward propagation of the metamorphism and magmatism can be clearly identified. In contrast, the new data reveal a progressive propagation of the thermal anomaly from the base to the surface of the continental crust. Focusing on the key localities of the Mauléon basin, Arguenos-Moncaup, Lherz, Boucheville and the Bas-Agly, we analyze the thermal conditions prevailing during the Cretaceous crustal thinning. The results are synthetized into a series of three regional thematic maps and into two detailed maps of the Arguenos-Moncaup and Lherz areas. The results indicate a first-order control of the thermal gradient by the intensity of crustal thinning. The highest grades of metamorphism are intimately associated with the areas where subcontinental mantle rocks have been unroofed or exhumed.

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Section: Evaporite-enhanced Thermal Conduction Vs Blanketing Effectmentioning

confidence: 94%

High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

et al. 2015

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“…(Gregersen et al, 2013). However, the identification of the transition between syn-rift and post-rift settings may not always be reflected by a simple breakup unconformity (Alves et al, 2009;Soares et al, 2012). These authors show that the "breakup unconformity" is a Lithospheric…”

Section: Magmatism and Influence Of The Mantle Plumementioning

confidence: 96%

“…Reston and Perez-Gussinye, 2007;Franke, 2013); the role of depth dependent stretching and multiple rift stages (e.g. Huismans & Beaumont, 2011;Soares et al, 2012); and the influence of mantle plumes (White and McKenzie, 1989;Clift and Turner, 1995;Corti, 2009;Lundin and Doré, 2011). These studies commonly focus on portions of margins, or their equivalents on the conjugate margins.…”

Section: Introductionmentioning

confidence: 99%

Tectonic variation and structural evolution of the West Greenland continental margin

Alsulami¹,

Paton²,

Cornwell³

2015

Bulletin

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“…Careful examination of the timing and distribution of post-break-up compressional structures and unconformities at 'passive margins' may thus yield important insights to generic problems like the evolution of intraplate stress fields (Zoback, 2007;Soares et al, 2012) or the impact of mantle flow on surface topography (Braun, 2010). We suggest that there is now sufficient evidence that post-break-up tectonism is to be anticipated and not thought of as anomalous along the previously called 'passive margins'.…”

Section: Divergent Margins As Recorders Of Plate Boundary Forces Tecmentioning

confidence: 93%

“…These variations are important because they imply significant differences in the history of continental rifting and break-up for the different crustal segments that comprise divergent margins. Lundin & Dor e, 2002;Davies et al, 2004;Beglinger et al, 2012;Soares et al, 2012). The relative values of crustal stretching and basement subsidence experienced during syn-rift extension on future divergent margins are also poorly understood (e.g.…”

Section: Introductionmentioning

confidence: 99%

Deep‐water continental margins: geological and economic frontiers

et al. 2014

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Deep-water margins have been the focus of considerable research during the past decade. They comprise vast, underexplored regions, in which only recently have improvements in seismic imaging and drilling technology allowed the discovery of significant hydrocarbon accumulations. This volume comprises of a series of manuscripts based on studies from continental margins bordering India, East Africa, Australia, China, Norway, the United Kingdom, Iberia, Newfoundland, the southern US, West Africa and Brazil, thus offering a global perspective on the evolution and economic significance of deep-water margins. The articles in this volume examine: (i) the quantification of extension and hyperextension in distal parts of continental margins, and their relationship with regional subsidence, (ii) the importance of magmatism in the structural and thermal evolution of rifted continental margins, (iii) the processes driving and the significance of regional exhumation during and after syn-rift stretching, (iv) the tectonic setting of salt basins and (v) depositional patterns along deep-water margins. To complement this work, we present a personal view of some of the specific questions that need to be addressed in the next few years of deepwater continental margin research.

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The breakup sequence and associated lithospheric breakup surface: Their significance in the context of rifted continental margins (West Iberia and Newfoundland margins, North Atlantic)

Cited by 114 publications

References 72 publications

High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

High-temperature metamorphism during extreme thinning of the continental crust: a reappraisal of the North Pyrenean passive paleomargin

Tectonic variation and structural evolution of the West Greenland continental margin

Deep‐water continental margins: geological and economic frontiers

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