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    STUDIA GEOLOGIA - Issue no. 1 / 2000  
         
  Article:   PRECISE U-PB ZIRCON DATING OF THE SYENITE PHASE FROM THE DITRĂU ALKALINE IGNEOUS COMPLEX.

Authors:  PANĂ DINU, IOAN CORIOLAN BALINTONI, HEAMAN LARRY.
 
       
         
  Abstract:  The Ditrău igneous complex represents the largest alkaline intrusion in the Carpathian-Pannonian region consisting of a plethora of rock types formed by complicated magmatic and metasomatic processes. A detailed U-Pb zircon age study is currently underway and the results for the syenite intrusion phase is reported herein. The U-Pb zircon emplacement age of the syenite of 229.6 +1.7/-1.2 Ma documents the quasi-contemporaneous production and emplacement of the gabbro and syenite magmas. We suggest that the syenite and associated granite formed by crustal melting during the emplacement of the mantle derived gabbroic magma around 230 Ma. The thermal contact aureole produced by the Ditrău alkaline igneous complex constrains the main tectonism recorded by surrounding metamorphic lithotectonic assemblages to be pre-Ladinian.  
         
     
         
         
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