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    STUDIA GEOLOGIA - Issue no. 3 / 2003  
         
  Article:   RECENT MINERAL DEPOSITION IN THE CRATER OF THE CIOMADUL QUATERNARY VOLCANO - HARGHITA MOUNTAINS (ROMANIA).

Authors:  OLIVIER HERCOT, IOAN SEGHEDI, JEAN NAUD, RAZVAN CARACAS.
 
       
         
  Abstract:  At the margin of Sf. Ana crater, on the Ciomadul volcano, representing the morphological mark of the youngermost volcano in south-eastern Europe (ca. 30 ka), a recent deposition of sulphates and carbonate has been found. The deposition drapes a cavity of a supporting wall on the right side of the road, which leads into the interior of the crater. The detected sulphates are thenardite [Na2SO4] and aphthitalite [K3Na2(SO4)2], rarely found in natural conditions. A rare carbonate, nahcolite [NaHCO3] was also detected associated with the sulphates. Since the mineral assemblage is intimate and has low crystalinity it was not possible to isolate each mineral phase for detailed analyses. Further collection and observation will be done in the future for better characterisation of this recent mineral deposition.  
         
     
         
         
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