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    STUDIA GEOLOGIA - Issue no. 3 / 2003  
         
  Article:   SOURCE REGIONS OF THE MELT AND FLUID PHASES IN THE PORPHYRY CU-AU-MO DEPOSITS AND OTHER VOLCANIC STRUCTURES FROM ALPINE CARPATHIAN CHAIN (ROMANIA).

Authors:  IOAN PINTEA.
 
       
         
  Abstract:  The aim of the study focuses on several fundamental questions regarding the melt and fluid inclusion studies in the magmatic-hydrothermal environments from the Alpine volcanic area of the Carpathians in Romania. These will be addressed mainly in regard to the primary source regions of saline and sulfide-rich silicate melts and supercritical aqueous fluids, based upon the authorís data interpretations (i.g. Pintea, 1993,1997, 2000, 2002 and unpublished data). 1. Melt and fluid inclusions from the inner part of the porphyry copper deposits were segregated phases exolved during the emplacement of a shallow subvolcanic body, which hosts the main part of the potassic and ore zone. Alternatively, they were transported in a flushing system and injected in the solid country rocks. 2. During the complex evolution of a stratovolcano there is some mafic magmatic input, which periodically supplies sulfur as well as siderophile and calcophile elements. Our petrographic and microthermometric data show evidence that the melt and fluid inclusions originated from deeper mafic magmas and mixed with felsic melts in intermediate magma chamber(s) in several stratovolcanoes. Finally, it is shown that the silicate melts and supercritical aqueous fluids, segregated from shallow felsic magma chamber(s), remain the most important sources of metals transported by various ligands as chloride - complexes, sulphates etc, mainly in the porphyry copper and epithermal ore deposits. Nevertheless the evolved sulfide-rich melt coming from a deeper mafic magma had enriched substantially the former ore deposits in several late tectono-magmatic events. ...  
         
     
         
         
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