Grevemeyer, Ingo

Moeller, Stefan

Prada, M.

Ranero, César R.

Sallares, V.

Vendrell, M. G.

Zitellini, N.

English

OceanRep

Geophysical Research AbstractsVol. 14, EGU2012-13681, 2012EGU General Assembly 2012© Author(s) 2012The tectonic and sedimentary structures of the Tyrrhenian rifted basinfrom multichannel seismic imagesM.G. Vendrell (1), C.R. Ranero (2), V. Sallarès (3), M. Prada (3), S. Moeller (4), I. Grevemeyer (4), and N.Zitellini (5)(1) Barcelona Center for Subsurface Imaging, ICM-CSIC. Barcelona, Spain (mguzman@icm.csic.es), (2) Barcelona Centerfor Subsurface Imaging, ICREA at CSIC, ICM-CSIC. Barcelona, Spain , (3) Barcelona Center for Subsurface Imaging,UTM-CSIC. Barcelona, Spain, (4) GEOMAR. Kiel, Germany, (5) Istituto di Scienze Marine, CNR. Bologna, ItalyThe Tyrrhenian basin has developed during the Neogene in a convergence setting between the Nubian and theEuropean plates. The aim of this work is to unravel at basin-scale, the geological processes that have been workingduring the last 15 M.y. and giving the current structures.Data used in this study consist in a serie of multichannel seismic profiles acquired during the MEDOC survey withthe Spanish R/V Sarmiento de Gamboa in 2010. These profiles have been processed to obtain images of the crustalstructure. These seismic sections have been calibrated with data from some drillings from ODP (Oceanic DrillingProject) and DSDP (Deep Sea Drilling Project), for the identification of the main sedimentary units. In addition,this information has been integrated with full coverage multibeam bathymetry of the basin that permits to map thelateral extension of the main structures imaged in the seismic data.The seismic lines cross the entire basin at locations designed to provide images of the main tectonic units. The basinpresents a strong lateral heterogeneity in the internal structure of the basement that may indicate lateral changes inits nature. The distribution of the sedimentary depositional centers, their size and thickness is also variable.We observe a transition from little extension in the northernmost region of the basin, to an increasing amount ofextensions southeastwards, where extension has proceeded and may have lead to full crustal separation and mantleexhumation at the time of rifting.The conjugated margins show an asymmetric distribution of the extension and the relationships between faultingand sedimentary deposits. On the west side, the faults bound the largest sedimentary sub-basins in the Thyrrhenian,and conjugate side displays more dense faulting, but the faults have smaller offset, and lateral continuity implyingsmaller amounts of extensions. The sub-basins at this side are shallow and spatially restricted. The discontinuousnature of the deposits in gravens and half-gravens makes the correlation of sedimentary units difficult.The data shows that the basin crustal structure and the distribution of sedimentary deposits have been controlledby early extensional tectonics. Subsequent magmatism may have even dominated over tectonic stretching andfinally the systems changed to produce crustal break up and mantle exhumation without no melting related to theextension.

The tectonic and sedimentary structures of the Tyrrhenian rifted basin from multichannel seismic images

The tectonic and sedimentary structures of the Tyrrhenian rifted basin from multichannel seismic images

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