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    STUDIA GEOLOGIA - Ediţia nr.3 din 2003  
         
  Articol:   FLUID INCLUSIONS IN SALT (TRANSYLVANIAN BASIN, ROMANIA).

Autori:  VASILE POMÂRLEANU, IOAN MÂRZA.
 
       
         
  Rezumat:  The paper presents general morphological aspects of salt crystals, as well as data of fluid inclusions from the Ocna Dej and Slănic Prahova salt deposits. The salt horizon from Ocna Dej is situated above the Dej volcanic tuff. Chronostratigraphically it belongs to Badenian, to the NN5 zone (Msroş, Mrza, 1991) or to the NN6 zone (Chira, 2000). The salt level from the Slănic synclinal (Prahova county) overlaps the Piatra Verde Tuff. Stratigraphically, both, the volcanic tuff and the salt correspond to the Dej Tuff and to the Badenian salt horizon from Transylvania respectively. The formation of salt deposits results from successive stages of a specific process taking place at the surface of the salt saturated water in marine basins. Similar processes occur in addition in underground water at various depths as well as at the sediment/water interface. Hopper crystals represent specific crystal growth features, respectively a cubic crystal of salt, in which the faces of the cube have grown more at the edges than in the center, forming as a consequence after several growth steps a pyramidal outline. The genesis of hopper crystals is explained by the formation of a fine-grained film of salt at the water surface, due to evaporation and to a continuous increasing solution density. With the procedure of growth of the incipient crystal develops a submerging trend; still the crystals remain at the water surface for a relatively long time, due to the surface tension of the solution. Because one of the crystal faces is in permanent contact with the high concentration and density solution, the crystal growth proceeds vertically. ...  
         
     
         
         
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