Geophysical characterisation of the ocean–continent transition at magma-poor rifted margins
Geophysical characterisation of the ocean–continent transition at magma-poor rifted margins
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 ultra-slow 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.
ocean-continent transition, marine seismics, rifted margin, crustal structure
382-393
Minshull, Timothy A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
May 2009
Minshull, Timothy A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Minshull, Timothy A.
(2009)
Geophysical characterisation of the ocean–continent transition at magma-poor rifted margins.
Comptes Rendus Geoscience, 341 (5), .
(doi:10.1016/j.crte.2008.09.003).
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 ultra-slow 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.
Text
minshull_revised_CR_Geoscience.pdf
- Accepted Manuscript
More information
Published date: May 2009
Keywords:
ocean-continent transition, marine seismics, rifted margin, crustal structure
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Local EPrints ID: 66802
URI: http://eprints.soton.ac.uk/id/eprint/66802
ISSN: 1631-0713
PURE UUID: 5a3cdaf7-e33d-4075-806e-ca48b553d1e6
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Date deposited: 22 Jul 2009
Last modified: 14 Mar 2024 02:43
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