Obiettivo Fluid-rock exchange processes can fractionate specific elements among the members of the reacting system and thus form one of the most important principal processes which lead to the formation of deposits of economic interest. In the deep continental crust, the sites of extensive fluid-rock exchange are restricted to ductile shear-zones where the pore-space necessary for fluids to migrate are formed during deformation. All granulite-facies terrains known are studied in detail by the project participants. These terrains exhibit spectacular examples of penetrative (ductile) shear-zones, often accompanied by massive changes in the chemical composition of the deformed rocks.An open question in this scenario is the problem of the rock-volume which is involved in the exchange process. It seems clear that the exchange process is not totally restricted to the shear-zone itself. The surrounding country rocks play an important role in this process, whether as the donator of specific elements or as the acceptor of elements mobilised in deeper levels. This problem in general is one of the most discussed problems in the formation of granulite facies terrains.To model and to quantify fluid-rock exchange processes, stable isotope geochemistry has become a powerful tool. A method based on stable isotope data which allows the characterisation of the degree of exchange between a rock assemblage of an area and fluids was developed at the Institute of Precambrian Geology and Geochronology in St. Petersburg. This model approach has been developed specifically to trace oxygen isotopic evolution in metamorphic systems. The method can be used to discriminate between open and closed system behaviour of a metamorphic fluid on different scales, from the sample size to a regional scale, and to deduce the physical conditions of the closure of oxygen exchange between given systems. During his extended field studies in east Antarctic polymetamorphic complexes, he was able to sample excellent material for this type of investigation.Together with the material available at the University of Copenhagen and the Rheinische Friedrich Wilhelms Universität Bonn, there exists an excellent base to study deep crustal fluid-rock exchange processes and to contribute to elementary problems of the formation of the lower continental crust. It can be expected that the research will close a gap that has existed for years, namely to bring together the often contrasting views of petrological, geochronological and stable isotope geochemical studies. This project is specifically confident to clarify the temperature and fluid conditions under which shear-zones develop. Programma(i) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Argomento(i) 52 - Geochemistry Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore Rheinische Friedrich-Wilhelms-Universität Bonn Contributo UE Nessun dato Indirizzo Poppelsdorfer Schloß 53115 Bonn Germania Mostra sulla mappa Costo totale Nessun dato Partecipanti (2) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Københavns Universitet Danimarca Contributo UE Nessun dato Indirizzo 1350 København Mostra sulla mappa Costo totale Nessun dato Russian Academy of Sciences Russia Contributo UE Nessun dato Indirizzo 199034 St. Petersburg Mostra sulla mappa Costo totale Nessun dato
