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


Minshull, Timothy A. (2009) Geophysical characterisation of the ocean–continent transition at magma-poor rifted margins. Comptes Rendus Geoscience, 341, (5), 382-393. (doi:10.1016/j.crte.2008.09.003).

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Description/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.

Item Type: Article
ISSNs: 1631-0713 (print)
Related URLs:
Keywords: ocean-continent transition, marine seismics, rifted margin, crustal structure
Subjects: Q Science > QE Geology
G Geography. Anthropology. Recreation > GC Oceanography
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 66802
Date Deposited: 22 Jul 2009
Last Modified: 27 Mar 2014 18:47
URI: http://eprints.soton.ac.uk/id/eprint/66802

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