International Geologiical Congress - Oslo 2008

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EUR-04 Tectonic evolution of the lithosphere from European Precambrian Craton to Alpine system on the base of the deep geophysic

 

Three crustal domains of the European plate - new digital Moho depth map

 

Marek Grad, Institute of Geophysics PAS (Poland)
Timo Tiira, Institute of Seismology (Finland)
 

 

The European plate has a 4.5 Gy Ga long and complex tectonic history. This is reflected in the present day large scale structures, particularly in the continental and regional scales of the Earth's crust. From the early 1970s, many crustal models have been produced for different regions in Europe.The integration of models derived from recent active and passive seismic experiments should allow the construction of maps with rather high resolution (1o or better) in many areas of Europe. In view of the quantity of high resolution data and models now available, particularly seismic models, it is an appropriate time to bring them together and produce new integrated map of the Moho depth for European plate. In fact this is the first digital, high resolution map of the Moho depth for European plate understand understood as an area from Ural Mountains in the east to mid-Atlantic ridge in the west, and from Mediterranean Sea in the south to Spitsbergen and Barents Sea in Arctic in the north. The Moho depth map is compiled from more than 250 data sets of individual seismic profiles, 3D models obtained by body and surface waves, receiver function results, and maps of seismic and/or gravity data compilations.
All tectonic large scale processes and geological structures of the European plate have their image in the Moho map. Long wave filtration permit to expose main elements of the European plate Moho in large scale. Thick crust of the East European platform (with Baltic shield) is separated in the west from Atlantic by Caledonides. In the south, between TESZ and Mediterranean Sea, accreted terranes form much shallower crust (ATA, Iberia, Pannonian Basin) with exception of thick collisional Alpine crust.The oldest Archean and Proterozoic crust of thicknessis 40-60 km thick, the continental Variscan and Alpine crust of thicknessis 25-35 km thick, and the youngest oceanic crust of Atlantic of thickneisss 10-20 km thick.

 

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