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Has Subduction Ended and Collision Started in the Mediterranean Realm?
|Authors:||Ranero, César R. ; Calahorrano, Alcinoe ; Sallarès, Valentí|
|Publisher:||American Geophysical Union|
|Citation:||2016 AGU Fall Meeting (2016)|
|Abstract:||We would like to discuss the interpretation of new (Geomargen-1 cruise in 2011 and Chianti cruise in 2015) and re-processed (Imerse project) marine seismic reflection images across Mediterranean subduction zones. The images show the entire structure of the 3 subduction wedges of the Gulf of Cadiz, Ionian Prism, and Mediterranean Prism. The wedges are formed by imbricated piles of sediment, which possibly represent thrust sheets, overlying a set of subhorizontal little-deformed strata. This structural configuration resembles accretionary prisms of large subduction systems like Indonesia, Alaska, Cascadia and segments of Ecuador and Chile. However, the Mediterranean wedges display several distinctive additional structural characteristics, including abundant evidence of recent contractional and strike-slip deformation (affecting the seafloor structure) that is widespread across the entire wedges. This recent faulting spans from the deformation front to the surrounding emerged region. High-resolution seafloor mapping shows numerous mud mounds and fresh scarps associated to those faults, supporting that they are currently active. Thus, the tectonic structure is different from the structure of prisms in other systems worldwide, where nearly all convergence-related deformation is focused in the frontal region and large isolated splays. Further, images from dedicated processing directed to preserve resolution support that in the 3 Mediterranean subduction zones the frontal segment of the decollement separating over-thrust from under-thrust sediment is currently a fossil structure covered by tens to hundreds of meters of undeformed sediment. If our interpretation is correct, the main plate-boundary fault of the three subduction zones is no longer active. In our view, subduction and slab roll back that formed the Neogene Mediterranean basins and arcs are no longer driving processes, and lithospheric collision has recently started across the entire realm|
|Description:||American Geophysical Union Fall Meeting, 12-16 December 2016, San Francisco|
|Publisher version (URL):||https://agu.confex.com/agu/fm16/meetingapp.cgi/Paper/177936|
|Appears in Collections:||(ICM) Comunicaciones congresos|
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