Iberian plate kinematics: a jumping plate boundary between Eurasia and Africa

Srivastava, S. P.; Schouten, Hans; Roest, W. R.; Klitgord, Kim D.; Kovacs, L. C.; Verhoef, J.; Macnab, Ron

doi:10.1038/344756a0

Cited by 190 publications

(153 citation statements)

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“…-Finally, the lateral variability of the thermal anomaly along the NPZ might be related to the scissors-shape opening of the extended domain during the Cretaceous (Masson and Miles, 1984;Srivastava et al, 1990;Sibuet and Collette, 1991;Roest and Srivastava, 1991;Sibuet 2004;Jammes et al, 2010).…”

Section: Spatial Distribution Of the Thermal Anomaly At The Scale Of mentioning

confidence: 99%

“…Three main types are generally opposed: (i) the transtensional rift model (Choukroune et Mattauer 1978;Olivet 1996), which involves a dominant left-lateral strike-slip along the NPF; (ii) a model implying most of the left-lateral movement during the Jurassic to Aptian times followed by orthogonal extension during Albian to Cenomanian times (Schettino et Turco 2010;Jammes et al, 2009); (iii) and a scissor-opening model, which implies the existence of an important subduction beneath the Pyrenean belt (Srivastava et al, 1990;Sibuet et al, 2004;Vissers and Meijer 2012a, b). For these authors, the extension observed in the pre-Pyrenean domain at that time (Dinarès-Turell andGarcia-Senz, 2000, 2002) would result from back-arc extension or gravitational instability of the lithosphere above the subducted oceanic lithosphere.…”

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confidence: 99%

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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: Spatial Distribution Of the Thermal Anomaly At The Scale Of mentioning

confidence: 99%

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confidence: 99%

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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“…Most of the works published until recent years have shared the hard task of fitting seafloor magnetic anomalies (e.g. Srivastava et al, 1990;Rosenbaum et al, 2002), paleomagnetic (e.g. Van der Voo, 1969) and geological data (e.g.…”

Section: Introductionmentioning

confidence: 99%

Plate kinematics in the Cantabrian domain of the Pyrenean orogen

Tavani

2012

Solid Earth

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The Cantabrian domain represents the western portion of the Pyrenean orogen, in the area where the Iberian continental lithosphere was subducted toward the north underneath the transitional to oceanic lithosphere of the Bay of Biscay. There, the about 100 km of orogenic convergence have been mostly accommodated in the northern portion of the orogen (i.e. the retro wedge) developed in the Bay of Biscay abyssal plain, while only crustal-scale folding with limited internal deformation occurred in the Cantabrian southern wedge (pro-wedge). Integrated meso- and macrostructural analyses and a reappraisal of available information from the transitional area between the Pyrenean and Cantabrian domains are presented in this work, allowing to set geometric and kinematic constraints on the entire Meso-Cenozoic history of the northern portion of the Iberian Plate, including subduction initiation and evolution in the western portion of the Pyrenean orogen. <br><br> The structural record of the Late Jurassic to Early Cretaceous deformation stage, which was associated with rifting and seafloor spreading in the Bay of Biscay, indicates a ridge perpendicular (NNE-SSW oriented) extension, with no evidence of relevant strike-slip components during rifting. A Cenozoic NNW-SSE oriented shortening stage followed, related to the limited (about 100 km) north-directed subduction of the Iberian continental lithosphere underneath the transitional to oceanic lithosphere of the Bay of Biscay. Subduction led to the formation of the poorly-developed Cantabrian pro-wedge, which is laterally juxtaposed to the well-developed Pyrenean pro-wedge to the east. During this convergence stage, the structural framework in the Cantabrian pro-wedge, and particularly along its transition with the Pyrenean wedge to the east, was severely complicated by the reactivation of Paleozoic and Mesozoic inherited structures. <br><br> Data presented in this work fully support the development of the Cantabrian Mountains as related to indentation and consequent thickening of the Bay of Biscay transitional lower crust during north-directed subduction of Iberian continental lithosphere. In essence, the Cantabrian pro-wedge is a lithospheric south-verging fault-propagation anticline developing above the subduction plane. The structural record in the area indicates that a lithospheric fault-propagation folding stage was predated, during the very early stages of orogenic shortening, by the development of a lithospheric-scale open syncline overlying the nucleation point of lithosphere sinking. Such a syncline is today partially preserved and represents one of the few natural examples of subduction initiation

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“…This makes our planet filled with large coastlines. In Portugal, the coast extends for around 943Km in the continent adding to 667Km and 250Km in Azores and Madeira islands, respectively [1]. Also, other countries, such as Brazil, have more than 8000Km of coastline, one of the largest in the World.…”

Section: Introductionmentioning

confidence: 99%