The workshop focused on the structure and evolution of the Precambrian basement and the sedimentary basins along the EUROBRIDGE transect which extends from SE Sweden across the Baltic Sea to Lithuania, Belarus and the Ukraine. Adjacent areas are also considered.

The following four principal topics were discussed:

C. 70 participants from 15 countries (Australia, Belarus, Canada, Estonia, Finland, Germany, Latvia, Lithuania, The Netherlands, Norway, Poland, Russia, Sweden, the Ukraine and the U. K.) attended the workshop (cf. Annex 1).

The programme of oral presentations (cf. Annex 2) comprised selected talks that highlighted geodynamic aspects of recent geological-geophysical interpretations of the lithospheric structure and presented major current results of the different EUROBRIDGE working groups. Largely, however, the workshop was organised in poster sessions that together comprised 24 presentations. Thus each day's work on June 13th through 15th featured morning oral presentations and afternoon poster sessions, and attendant discussions. There were also two one-hour lectures by invited speakers (Prof. Jeremy Hall, Memorial Univ. of Newfoundland, Canada and Prof. Roye Rutland, Australia) who shared their experience of integrated geological-geophysical interpretations of Precambrian crust in other parts of the world. Several meetings of the EUROBRIDGE working groups discussed ongoing work and plans for the future.

June 13th was devoted dominantly to geophysical results obtained along and around the EUROBRIDGE transect line in 1994, 1995 and 1996. The seismics group demonstrated various velocity models for the hitherto completed ca 800 km long part of the overall DSS and wide-angle reflection profile. This part traverses all the main Palaeoproterozoic tectonic units of the Fennoscandian crustal segment situated along the EUROBRIDGE line. We found that despite different approaches to seismic modelling, a common, consistent model can be proposed for the lithospheric structure. The obtained velocity model for the crust and the upper mantle agrees well with the geologically inferred structural pattern.

The seismics group devoted much effort to finish the work plan for the 1997 experiment. This leg of work involves ca. 500 km of DSS profiling, mostly in the Ukraine. The actual shooting will be carried out in early September. Recording stations will be provided by Germany (40 stations), Finland (20), Poland (20), the UK (10), the Ukraine (40 stations of the "Cherepakha" type), and possibly Sweden (15). During the workshop, the organisation and many particulars of this work were finalised. The help of Dr. Jeremy Hall in providing for the 1997 experiment is particularly gratefully acknowledged.

New magnetotelluric soundings have, meanwhile, been carried out along 400 km of the Belorussian part of the transect. The crust along this part of the profile can be divided into several "block" units with different structural patterns in their upper and middle parts. These "blocks" appear to represent various tectonic terranes. The Fennoscandia - Sarmatia crustal-segment boundary is well expressed by differences of crustal electrical conductivity.

Various numerical approaches to model the magnetic and gravity potential fields and relate these to the seismic data were proposed and discussed. Transformations of the potential fields obtained in Lithuania allow the tracing of some discontinuities deep into the crust and also the assessment of their shapes. Simultaneously, it became clear that a major difficulty is the current absence of potential field maps for SE Sweden and the Baltic Sea area which could be related to the EUROBRIDGE seismic data. A working group on potential fields across the Baltic Sea was therefore created. Dr. V.Nasedkin (Lithuania) will act as its convenor. In 1997/98, this group will compile all presently available data into a set of preliminary geophysical maps, specifically magnetic and gravity.

In his lecture, Dr. Hall, Canada, particularly emphasised the difficulties that arise when solely refraction seismic results are used in geodynamic interpretation. These data alone cannot provide the kinematic evidence required to understand the development of the continental crust.

The invited lecture by Prof. Rutland considered a case study where refraction and reflection seismic data were combined successfully with geological and other geophysical information to create a consistent integrated model useful for prospecting in a key ore province in Australia.

The significance of platformal tectonic processes and particularly neotectonics for the interpretation of the observed geophysical signatures was another recurrent important subject. Of particular interest was a map of the very heterogeneous heat flow in the region, with important inferences in regard to the rheology of the lithosphere and its seismic, gravity and magnetic structures. This subject was considered specifically by, among others, R. Stephenson, R. Garetsky, and I. Pashkevich. An ad-hoc working group for lithospheric modelling employing geothermics was created (co-ordinators R. Stephenson, V. Zui, and S.Šliaupa).

The Vilnius workshop summarised many results obtained in 1994-1996. These were approved and it was decided to seek publication in a special volume of TECTONOPHYSICS, reflecting both the geological and geophysical aspects of EUROBRIDGE research. Dr. S. Bogdanova, Prof. R. Gorbatschev and Dr. R. Stephenson agreed to be editors of the volume. The manuscripts should be submitted by November 1997. In accordance with this, the EUROBRIDGE seismic group will meet in Potsdam to prepare their papers (coordinators are R. Giese and J. Doody).The next EUROPROBE/EUROBRIDGE workshop is planned to be held in the Ukraine, in September- October 1998.