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    STUDIA GEOLOGIA - Ediţia nr.3 din 2003  
         
  Articol:   THE ROLE OF FLUIDS DURING FORMATION OF THE SVECOFENNIAN MAGMATIC ROCKS (RUSSIA).

Autori:  ELENA KOUZMINA.
 
       
         
  Rezumat:  The Tervu massif is one of the Late Svecofennian magmatic massifs situated near the Archean–Proterozoic boundary within the Fennoscandian shield (The North-West Ladoga Region, Russia). Features of the fluid regime during the crystallization of the two feldspars granites of the Tervu massif’s have been studied. Based on thermo- and cryometric methods, five types of fluid inclusions were identified in quartz crystals, as follows: 1) inclusions of H2O (mono, two-phase); 2) low mineralized-aqueous mono- and two-phase inclusions (up to 1-3 wt. % of NaCl, KCl); 3) highly mineralized-aqueous (Na+, K+, Ca2+, Mg2+ salts, i.g. chlorides) inclusions (two- or poly-phase); 4) high density CO2-inclusions (mono-, two-phase); 5) CH4-N2 inclusions (mono-phase). The frequency of the fluid inclusions shows an apparent heterogeneity of the different parts of the massif. Also, the concentration and composition of the fluid inclusions in different parts of the massif are variable. The wide dispersion of the distribution of the H2O and CO2 inclusions is typical. All the data obtained on the fluid inclusions of the Tervu massif indicate that the equilibrium of the earliest inclusions changed later, during late-metamorphic events, and, probably, new supplies of metamorphic fluids were introduced in the granitic system. ...  
         
     
         
         
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