کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4681211 | 1634952 | 2006 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Imaging a lithospheric detachment at the continent–ocean crustal transition off Morocco Imaging a lithospheric detachment at the continent–ocean crustal transition off Morocco](/preview/png/4681211.png)
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.
Journal: Earth and Planetary Science Letters - Volume 241, Issues 3–4, 31 January 2006, Pages 686–698