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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   A SR-O-H ISOTOPIC STUDY OF THE APUSENI MOUNTAINS NEOGENE MAGMATIC PROVINCE, ROMANIA.

Authors:  IOAN SEGHEDI, ANA-VOICA BOJAR, HILARY DOWNES, EMILIAN ROŞU, SONIA TONARINI, PAUL MASON. 		 
       
         
  Abstract:  Neogene magmatism in the Apuseni Mountains of Romania was active between 15 and 7 Ma, with an isolated final eruption at 1.6 Ma. Several groups of magmatic rocks can be distinguished on the basis of ages, trace elements, and isotopic compositions. Most are of calc-alkaline affinity, despite the fact that the region is located 200 km from the Carpathian subduction trench. However, adakite-like calc-alkaline magmas were also erupted and the youngest eruptions were of alkaline affinity. In this study we present 27 new oxygen isotope data, 15 hydrogen and 17 new Sr isotope analyses on mineral separates and groundmass from samples from the Apuseni Mountains. All the analyzed rocks lack olivine but contain phenocrysts of clinopyroxene, amphibole, biotite and sometimes-abundant plagioclase.  
         
     
         
         
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