Constraints on the frontal crustal structure of a continental collision from an integrated geophysical research: The central‐western Betic Cordillera (SW Spain)
Identifieur interne : 001305 ( Main/Exploration ); précédent : 001304; suivant : 001306Constraints on the frontal crustal structure of a continental collision from an integrated geophysical research: The central‐western Betic Cordillera (SW Spain)
Auteurs : A. Ruiz-Constán [France] ; A. Pedrera [Espagne] ; J. Galindo-Zaldívar [Espagne] ; J. Pous [Espagne, États-Unis] ; J. Arzate [Mexique] ; F. J. Roldán-García [Espagne] ; C. Marin-Lechado [Espagne] ; F. Anahnah [Espagne]Source :
- Geochemistry, Geophysics, Geosystems [ 1525-2027 ] ; 2012-08.
Abstract
Mélange rocks outcrop widely in the central and western frontal sectors of the Betic Cordillera, as in many other collisional orogens where they form part of the accretionary wedges. Extrusion of Triassic plastic clays and evaporites was favored by the progressive accretion of the Betic External Zones, mixing rocks of different provenance and forming a synorogenic frontal mélange unit. MT data coupled with gravity data are a valid combined methodology to characterize the geometry of these mélange units, since the characterization of plastic rocks geometry is usually uncertain using seismic techniques. The results correlate well with known geological features (sedimentary basins, calcareous ranges, evaporitic rocks) and reveal the deep geometry. A resistive body, slightly dipping toward the SE, points to the continuity of the Iberian Massif below the Guadalquivir basin (2°) and the External Zones (6–8°). To the south, gravity models show the Iberian continental crust subducting below the Internal Zones with a roughly 20–35° slope. The main conductive bodies are related to the location of evaporitic rocks involved in the frontal mélange. They overlie the Iberian Massif and, southwards, the frontal Jurassic and Cretaceous limestone sequences of the External and Median Subbetics. In this setting, thick plastic rock units placed above the foreland could act as a lubricant facilitating continental subduction, and being progressively accreted toward a frontal mélange.
Url:
DOI: 10.1029/2012GC004153
Affiliations:
- Espagne, France, Mexique, États-Unis
- Andalousie, Catalogne, Communauté de Madrid, Languedoc-Roussillon, Occitanie (région administrative)
- Barcelone, Grenade (Espagne), Montpellier
- Université de Barcelone, Université de Grenade
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Geosyst.</title><idno type="ISSN">1525-2027</idno><idno type="eISSN">1525-2027</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2012-08">2012-08</date><biblScope unit="volume">13</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">1525-2027</idno></series><idno type="istex">9B9F17A9128F30DA225B6D6DB9471A8C1FEA0C30</idno><idno type="DOI">10.1029/2012GC004153</idno><idno type="ArticleID">2012GC004153</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1525-2027</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Mélange rocks outcrop widely in the central and western frontal sectors of the Betic Cordillera, as in many other collisional orogens where they form part of the accretionary wedges. Extrusion of Triassic plastic clays and evaporites was favored by the progressive accretion of the Betic External Zones, mixing rocks of different provenance and forming a synorogenic frontal mélange unit. MT data coupled with gravity data are a valid combined methodology to characterize the geometry of these mélange units, since the characterization of plastic rocks geometry is usually uncertain using seismic techniques. The results correlate well with known geological features (sedimentary basins, calcareous ranges, evaporitic rocks) and reveal the deep geometry. A resistive body, slightly dipping toward the SE, points to the continuity of the Iberian Massif below the Guadalquivir basin (2°) and the External Zones (6–8°). To the south, gravity models show the Iberian continental crust subducting below the Internal Zones with a roughly 20–35° slope. The main conductive bodies are related to the location of evaporitic rocks involved in the frontal mélange. They overlie the Iberian Massif and, southwards, the frontal Jurassic and Cretaceous limestone sequences of the External and Median Subbetics. In this setting, thick plastic rock units placed above the foreland could act as a lubricant facilitating continental subduction, and being progressively accreted toward a frontal mélange.</div></front></TEI><affiliations><list><country><li>Espagne</li><li>France</li><li>Mexique</li><li>États-Unis</li></country><region><li>Andalousie</li><li>Catalogne</li><li>Communauté de Madrid</li><li>Languedoc-Roussillon</li><li>Occitanie (région administrative)</li></region><settlement><li>Barcelone</li><li>Grenade (Espagne)</li><li>Montpellier</li></settlement><orgName><li>Université de Barcelone</li><li>Université de Grenade</li></orgName></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Ruiz Onstan, A" sort="Ruiz Onstan, A" uniqKey="Ruiz Onstan A" first="A." last="Ruiz-Constán">A. 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Galindo-Zaldívar</name><name sortKey="Marin Echado, C" sort="Marin Echado, C" uniqKey="Marin Echado C" first="C." last="Marin-Lechado">C. Marin-Lechado</name><name sortKey="Marin Echado, C" sort="Marin Echado, C" uniqKey="Marin Echado C" first="C." last="Marin-Lechado">C. Marin-Lechado</name><name sortKey="Pedrera, A" sort="Pedrera, A" uniqKey="Pedrera A" first="A." last="Pedrera">A. Pedrera</name><name sortKey="Pous, J" sort="Pous, J" uniqKey="Pous J" first="J." last="Pous">J. Pous</name><name sortKey="Roldan Arcia, F J" sort="Roldan Arcia, F J" uniqKey="Roldan Arcia F" first="F. J." last="Roldán-García">F. J. Roldán-García</name><name sortKey="Roldan Arcia, F J" sort="Roldan Arcia, F J" uniqKey="Roldan Arcia F" first="F. J." last="Roldán-García">F. J. Roldán-García</name></country><country name="États-Unis"><noRegion><name sortKey="Pous, J" sort="Pous, J" uniqKey="Pous J" first="J." last="Pous">J. Pous</name></noRegion></country><country name="Mexique"><noRegion><name sortKey="Arzate, J" sort="Arzate, J" uniqKey="Arzate J" first="J." last="Arzate">J. Arzate</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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