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    STUDIA GEOLOGIA - Ediţia nr.3 din 2003  
         
  Articol:   MINERAL CHEMISTRY OF THE PRIMARY MAGMATIC MINERAL ASSEMBLAGE OF THE ĄDEJ TUFFĒ (ROMANIA).

Autori:  ALEXANDRU SZAK√ĀCS.
 
       
         
  Rezumat:  The Middle Miocene rhyolitic Dej Tuff Complex (the ĄDej TuffĒ) consisting of volcaniclastic sandstones and conglomerates, medium to fine-grained tuffs, and alternating thin layers of tuffs, tuffites and tuffaceous marls, records the inception of the Neogene volcanic activity in Romania. It crops out along the north-western and northern margin of the Transylvanian Basin, as well as along its southeastern margin (ĄPersani TuffĒ). It was also found in many boreholes throughout the whole basin. Former mineralogical investigations on the ĄDej TuffĒ focused mainly on its characteristic post-depositional diagenetic mineral assemblage. Its primary magmatic mineral assemblage is known only from classical petrographic studies. The aims of this study are 1) to identify the primary magmatic rock-forming mineral phases, either essential or accessory ones, 2) to distinguish them from accidental admixed phases, and 3) to investigate in detail, using modern analytical techniques, their mineral chemistry. ...  
         
     
         
         
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