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    STUDIA GEOLOGIA - Issue no. 3 / 2003  
         
  Article:   THE PRESENCE OF TOURMALINE IN THE HARGHITA MOUNTAINS’ VOLCANIC STRUCTURES (ROMANIA).

Authors:  ATTILA-ALBERT LACZKĂ“. 		 
       
         
  Abstract:  Based on currently knowledges, the tourmalinization processes in the Harghita Mountain’s Neogen-Quaternary volcanic arc have an important bearing in the major volcanic structures, such as Stânca, Ostoroş, Ivó - Cocoizaş, Vârghiş and Luci-Lazu volcanic structures (Fig. 1). Apart from the volcanic structures mentioned above, tourmaline is believed to occur in many other areas affected by the hydrothermal-metasomatic processes. That fact is based on the high boron concentrations in these areas, between 200-3000 ppm to 8000 ppm value (Tekerő crater on the north-eastern part of the Luci-Lazu volcanic structure; the area between the riverhead of the Köveş stream and the Cormoş stream; the area between the Mic stream and the Harom stream; the intracraterial zone of the Cucu volcano – Moţoi et al., 1975; Rădulescu et al., 1984). ...  
         
     
         
         
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