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- W2011370086 abstract "Geophysical characterisation of the ocean–continent transition (OCT) at magma-poor rifted margins has focused primarily on the determination of P wave velocities using wide-angle seismic techniques. Such experiments have shown that the OCT is heterogeneous, but that typically velocities increase gradually with depth from ∼ 5.0 km/s at top basement to ∼ 8.0 km/s at ∼ 5 km deeper, without a large and abrupt Moho transition. The velocity variation with depth is similar to that of old fracture zone crust, and appears to differ from that of oceanic crust formed at ultraslow spreading rates, though sampling of the latter is limited. Typically, the OCT is characterised by weakly lineated, low amplitude magnetic anomalies; the interpretation of these anomalies remains controversial. The oceanward limit of the OCT remains poorly defined on many margins. La caractérisation géophysique de la transition océan–continent (TOC) au niveau des marges appauvries en magma s’est focalisée en premier lieu sur la détermination des vitesses d’ondes P, utilisant les techniques de sismique grand angle. De telles mesures ont montré que la TOC est hétérogène, mais que les vitesses augmentent typiquement en fonction de la profondeur, depuis ∼ 5,0 km/s au toit du socle jusqu’à ∼ 8,0 km/s, ∼ 5 km plus bas, sans Moho marqué. La variation de vitesse en fonction de la profondeur est semblable à celle de la croûte d’ancienne zone de fracture et diffère de celle de la croûte océanique formée à des vitesses d’expansion ultralentes, quoique l’échantillonnage de ce dernier type soit limité. La TOC est typiquement caractérisée par des anomalies magnétiques de basse amplitude faiblement linéaires ; l’interprétation de ces anomalies reste l’objet de controverses. La limite de la TOC vers l’océan reste souvent mal définie sur de nombreuses marges." @default.
- W2011370086 created "2016-06-24" @default.
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- W2011370086 date "2009-05-01" @default.
- W2011370086 modified "2023-10-16" @default.
- W2011370086 title "Geophysical characterisation of the ocean–continent transition at magma-poor rifted margins" @default.
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- W2011370086 doi "https://doi.org/10.1016/j.crte.2008.09.003" @default.
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