Decollement tectonics in the Hercynian Cordillera of Northwest Spain

Julivert, Manuel

doi:10.2475/ajs.270.1.1

Cited by 217 publications

(128 citation statements)

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“…These are represented by Middle to Late Carboniferous syn to post-orogenic deposits, unconformably overlying pre-Cambrian to Lower Carboniferous rocks (Julivert, 1971;Pérez-Estaún et al, 1991;Dallmeyer et al, 1997). Hercynian and Late Hercynian faults are wellpreserved, and were reactivated during both Mesozoic rifting and Cenozoic convergence stages (e.g.…”

Section: The Central Cantabrian Beltmentioning

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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Section: The Central Cantabrian Beltmentioning

confidence: 99%

Plate kinematics in the Cantabrian domain of the Pyrenean orogen

Tavani

2012

Solid Earth

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“…La Zona Cantábrica (Lotze, 1945), fue dividida por Julivert (1971) en las siguientes regiones: Pliegues y Mantos, Cuenca Carbonífera Central, Manto del Ponga, Picos de Europa y Pisuerga-Carrión. Su estructura se interpreta como fruto del emplazamiento de mantos de despegue con pliegues asociados vergentes hacia el núcleo del arco, siguiendo un modelo que se asemeja a un diafragma fotográfico (Pérez Estaún el al., 1988).…”

Section: Introductionunclassified

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Gómez-Fernández¹,

Morán²,

López³

et al. 1993

Estud. geol.

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RESUMENEn el presente trabajo se pone de manifiesto la existencia de un proceso de dolomitización que afectó al sector sudeste de la región de Picos de Europa. Las dolomías formadas como consecuencia de este proceso son rocas de geometría muy variada e irregular, que recuerda a la de las masas intrusivas. Su composición química muestra un ligero exceso en calcio respecto a la fórmula estequiométrica de la dolomita. Sus contenidos en hierro y estroncio son bajos respecto a los de otras dolomías comparables. El volumen de dolomías formado es mucho mayor en la Unidad Frontal de Picos de Europa que en Unidades estructurales superiores.Los procesos dolomitizadores obedecen a un modelo de dolomitización epigenético y son previos a la deposición de mineralizaciones de Pb-Zn. Se propone un modelo de dolomitización per ascensum a partir de aguas de formación de los sedimentos de la región de Pisuerga-Carrión. En cuanto a la edad, la dolomitización es posterior al Estefaniense B inferior y posiblemente anterior a un momento del Pérmico no determinado. ABSTRACTIn this work we focus on the dolomitization processes which affected the southeastern sector of Picos de Europa Unit. The dolostones formed consequently with this process are rocks with a varied and irregular geometry, wich reminds that observed in intrusive rocks. Their chemical composition show a slight excess of calcium in relation to stoichiometric dolomite. Their iron and strontium contents are low in relation to other comparable dolomites. The abundance of dolostones is much bigger at the Frontal Unit than in upper structural Units.The dolomitization processes respond to an epigenetic dolomitization model and they are previous to the formation of Pb-Zn orebodies. We suggest a per ascensum dolomitization model tiggered by formation waters of the Pisuerga-Carrion Unit. With regard to age, the dolomitization was later than Lower Estephanian B and possibly earlier than sorne undetermined time during the Permian.

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“…1), which consists of thrust slices and small nappes caused by diastrophic movements of various Carboniferous ages, resulting from a tightening of the arc. The further subdivision of the Cantabrian Zone, as proposed by Julivert (1967Julivert ( , 1971, reflects major faults in the area constituting a single palaeogeographical region. The thrust structures have been moulded around a foreland spur that became more and more restricted to the east as time went by (see Wagner and Martínez García, 1974;Wagner, 2004).…”

Section: The Cantabrian Mountainsmentioning

confidence: 99%

The Role of Spain in the Development of the Reef Brachiopod Faunas During the Carboniferous

Prins

2007

Biogeography, Time, and Place: Distributions, Barriers, and Islands

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Decollement tectonics in the Hercynian Cordillera of Northwest Spain

Cited by 217 publications

References 0 publications

Plate kinematics in the Cantabrian domain of the Pyrenean orogen

Plate kinematics in the Cantabrian domain of the Pyrenean orogen

Untitled

The Role of Spain in the Development of the Reef Brachiopod Faunas During the Carboniferous

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