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Datation U-Pb sur zircons des dolérites tholéiitiques pyrénéennes (ophites) à la limite Trias-Jurassique et relations avec les tufs volcaniques dits « infra-liasiques » nord-pyrénéens

Identifieur interne : 00AF76 ( Main/Exploration ); précédent : 00AF75; suivant : 00AF77

Datation U-Pb sur zircons des dolérites tholéiitiques pyrénéennes (ophites) à la limite Trias-Jurassique et relations avec les tufs volcaniques dits « infra-liasiques » nord-pyrénéens

Auteurs : Philippe Rossi [France] ; Alain Cocherie [France] ; C. Mark Fanning [Australie] ; Yves Ternet [France]

Source :

RBID : Pascal:04-0550833

Descripteurs français

English descriptors

Abstract

The tholeiitic doleritic magmatism (ophites) in the Aspe valley of the Pyrenees has been dated on the Triassic-Jurassic boundary (199 ± 2 Ma) by the U-Pb method on zircon (SHRIMP). Emplacement of the ophites was probably synchronous with that of the earliest 'Infraliassic' Ségalas tuffs. The ophites are thus related to the Central Atlantic Magmatic Province (CAMP) whose emplacement linked with the fracturing of Pangea, preceded the opening of the Atlantic Ocean.


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Le document en format XML

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<title xml:lang="fr" level="a">Datation U-Pb sur zircons des dolérites tholéiitiques pyrénéennes (ophites) à la limite Trias-Jurassique et relations avec les tufs volcaniques dits « infra-liasiques » nord-pyrénéens</title>
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<term>Atlantic Ocean</term>
<term>Jurassic</term>
<term>Pyrenees</term>
<term>Triassic</term>
<term>U/Pb</term>
<term>chemical analysis</term>
<term>dating</term>
<term>emplacement</term>
<term>fracturing</term>
<term>ion probe data</term>
<term>magmatism</term>
<term>ocean opening</term>
<term>ophite</term>
<term>rare earths</term>
<term>tholeiitic dolerite</term>
<term>tuff</term>
<term>zircon</term>
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<keywords scheme="Pascal" xml:lang="fr">
<term>Pyrénées</term>
<term>Dolérite tholéïtique</term>
<term>Ophite</term>
<term>Datation</term>
<term>U-Pb</term>
<term>Zircon</term>
<term>Donnée microsonde ionique</term>
<term>Analyse chimique</term>
<term>Terre rare</term>
<term>Trias</term>
<term>Jurassique</term>
<term>Tuf volcanique</term>
<term>Magmatisme</term>
<term>Mise en place</term>
<term>Fracturation</term>
<term>Ouverture océan</term>
<term>Océan Atlantique</term>
<term>SHRIMP</term>
<term>Vallée d'Aspe</term>
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<div type="abstract" xml:lang="en">The tholeiitic doleritic magmatism (ophites) in the Aspe valley of the Pyrenees has been dated on the Triassic-Jurassic boundary (199 ± 2 Ma) by the U-Pb method on zircon (SHRIMP). Emplacement of the ophites was probably synchronous with that of the earliest 'Infraliassic' Ségalas tuffs. The ophites are thus related to the Central Atlantic Magmatic Province (CAMP) whose emplacement linked with the fracturing of Pangea, preceded the opening of the Atlantic Ocean.</div>
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