Imaging a lithospheric detachment at the continent ocean crustal transition off Morocco

Details Imaging a lithospheric detachment at the continent ocean crustal transition off Morocco Imaging a lithospheric detachment at the continent ocean crustal transition off Morocco

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.241..686m&link_type=abstract

Earth and Planetary Science Letters, Volume 241, Issue 3-4, p. 686-698.

Computer Science

5

Scientific paper

The SISMAR seismic survey on the Moroccan Atlantic Margin recorded deep penetration images of the continent ocean boundary. This paper focuses on the 3D observation of a landward dipping reflector, overlaid by a layered unit. The deep part of the reflector plunges towards the continent beneath thinned continental crust whereas its upper part finishes at the top of the basement in a transition zone where likely volcanics dipping reflectors are visible and where a magnetic anomaly named S1 marks the continent ocean boundary location. As the landward dipping reflector crosses the Moho, it is interpreted as a lithospheric detachment with associated volcanic material originating from the asthenospheric mantle. Observations are used (i) to build a 2D model to explain the mechanisms of the lithospheric breaking off between Moroccan margin and its conjugate Canadian margin, the landward dipping reflector allowing mantle exhumation; (ii) to propose an ENE WNW trend for the initial rifting extension in this part of Atlantic during late Triassic, direction compatible with that of the southern Grand Banks transform margin.

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