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EUROPROBE PROJECTS |
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EUROBRIDGE:
Paleoproterozoic Accretion of Sarmatia and Fennoscandia |
EUROBRIDGE is carrying out a wide range of interdisciplinary studies of
the East-European Craton (EEC) to better understand the Palaeoproterozoic and Archaean
crustal evolution, in particular, the processes involved in the accretion of vast volumes
of juvenile Palaeo-proterozoic crust.
EUROBRIDGE studies are concentrated on a broad transect in the
south-western part of the craton, extending from the Palaeoproterozoic crust of the
Fennoscandian Shield to the Archaean of the Ukraine, spanning the boundary between
Sarmatia and Fennoscandia.
Geophysical and geochemical studies has shown that this part of the craton is a remarkable
assemblage of Palaeoproterozoic terranes, with arcuate belts of lower crustal rocks thrust
together with upper crustal units. Archaean components, thought previously to dominate
this part of the EEC, are apparently absent.
The EEC is largely covered by Neoproterozoic and Phanerozoic rift-related and platform
successions. Knowledge of the underlying crystalline basement is primarily derived from
analyses of drill cores and geophysical data. Over 6000 drillholes in the research
transect provide both the unique opportunity to decipher the Proterozoic and earlier
history of the EEC. New seismic experiments, complementary to the existing potential field
data, are providing insight into the deeper lithosphere.
The research centers on:
The
deep structure of the southwestern EEC. This is being investigated by a DSS (refraction
and wide angle reflection) transect extending for over 1500 km from the exposed crust of
southwestern Fennoscandia to the Ukrainian Shield. Complementary potential field data are
being acquired.
Investigations
of the structure and P-T conditions of the various terranes, in combination with isotope
dating of crust-forming processes, with a focus on the Palaeoproterozoic terranes and the
collision zone between Fennoscandia and Sarmatia.
Analysis
of the Riphean and Phanerozoic structural histories, particularly of the Volhyn-Orsha
depression and the Pripyat Trough, to better understand the influence of Palaeoproterozoic
rheology on the younger structural evolution.
Studies
of lower crustal and upper mantle xenoliths, some diamondiferous.
Comparison
with other parts of the EEC and other cratons, particularly with those in North America,
Greenland, South America and Siberia.
Get the EUROBRIDGE
text and figures out of the EUROPROBE 1996 publication by clicking on the corresponding
text. Click on the figure and see the image enlarged
PDF-viewers can be
obtained through the net for different operating systems.
Text (PDF file, 430 kb)
For more information please contact the project
leader:
Dr. Svetlana R. Bogdanova
Department of Geology
Lund University
Sölvegatan 13
S-223 62 LUND
SWEDEN
Tel: +46-46/222 45 97, /12 83 20
Fax: +46-46/12 14 77
E-mail:
Svetlana.Bogdanova@geol.lu.se
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