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    STUDIA GEOLOGIA - Issue no. 1 / 2001  
         
  Article:   TUFFACEOUS CONGLOMERATES: SYN-ERUPTIVE RESEDIMENTED DEBRIS FLOW AND HYPERCONCENTRATED FLOW DEPOSITS FROM THE "RHYODACITIC FORMATION", GUTI MTS, EASTERN CARPATHIANS.

Authors:  ALEXANDRINA FÜLÖP.
 
       
         
  Abstract:  The first volcanic products from Guti Mts, Eastern Carpathians belong to the "Rhyodacitic Formation". The physical constituents of this formation are as follows: pyroclastic deposits (ignimbrites and fall tuffs), syn-eruptive resedimented volcaniclastic deposits, volcanogenic and non-volcanogenic sedimentary deposits. The tuffaceous conglomerates belong to the syn-eruptive resedimented volcaniclastics and represent the coarsest deposits. They outcrop in Băiţa area, west from Baia-Mare, being underlain by Lower Badenian (15.40.6 Ma) ignimbrites and overlain by Lower Sarmatian claystones. The main components of the conglomerates are boulders and cobbles of sedimentary and metamorphic rocks in a tuffaceous matrix. Scarse blocks eroded from the lower ignimbrite unit are present. In the frame of the study of the "Rhyodacitic Formation", the conglomerates have been investigated using facies analysis. The facies model concludes that the studied deposits have been emplaced from debris flows and hyperconcentrated flows. They derived from subaerial channelized ignimbrite flows, which underwent strong flow separation while jumping in submarine basin and settling in deep water, below wave base. Such conditions, above the lower subaerial ignimbrite unit, were determined by the subsidence of Săsar-Dealu Crucii compartment, contemporaneously developed with the conglomerates emplacement.  
         
     
         
         
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