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<dc:title xml:lang="fr">Méthodes potentielles appliquées à la quantification de l'aimantation des premières lithosphères océaniques</dc:title>
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<dc:subject xml:lang="fr">Marges pauvres en magma</dc:subject>
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<dc:subject xml:lang="fr">Inversions du champ magnétique terrestre</dc:subject>
<dc:subject xml:lang="en">Magma-poor rifted margins</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse porte sur l’analyse quantitative en méthodes potentielles appliquée à l’interprétation des anomalies magnétiques des marges conjuguées pauvres en magma Australie-Antarctique. Les travaux permettent, dans un premier temps, de mettre en évidence des corrélations entre les sources des anomalies gravimétriques et magnétiques par le biais de l’utilisation d’opérateurs de méthodes potentielles transformant les cartes gravimétriques et magnétiques. Les travaux de modélisation et d’inversion permettent de remettre en cause l’origine des anomalies magnétiques pour ces marges, habituellement interprétées comme liées à des inversions du champ magnétique terrestre (ICMT). Les anomalies magnétiques les plus proches du continents ont ainsi liées à un « effet de bord » magnétique, tandis que la majorité des anomalies sont corrélées à des variations topographiques du toit du socle, constitué de manteau serpentinisé. Seules les anomalies magnétiques les plus distales semblent liées à des ICMT. Les résultats de cette thèse remettent donc en cause les modèles cinématiques du bassin Australo-Antarctique basés uniquement sur les ICMT.</dcterms:abstract>
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