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Geophysical characterisation of the ocean–continent transition at magma-poor rifted margins

By Timothy A. Minshull

Abstract

Geophysical characterisation of the ocean-continent transition (OCT) at magma-poor rifted<br/>margins has focused primarily on the determination of P wave velocities using wide-angle<br/>seismic techniques. Such experiments have shown that the OCT is heterogeneous, but that<br/>typically velocities increase gradually with depth from ~5.0 km/s at top basement to ~8.0<br/>km/s at ~5 km deeper, without a large and abrupt Moho transition. The velocity variation<br/>with depth is similar to that of old fracture zone crust, and appears to differ from that of<br/>oceanic crust formed at ultra-slow spreading rates, though sampling of the latter is limited.<br/>Typically, the OCT is characterised by weakly lineated, low amplitude magnetic anomalies;<br/>the interpretation of these anomalies remains controversial. The oceanward limit of the OCT<br/>remains poorly defined on many margins

Topics: QE, GC
Year: 2009
OAI identifier: oai:eprints.soton.ac.uk:66802
Provided by: e-Prints Soton

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