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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   230TH AND 231PA-EXCESS GEOCHRONOLOGY OF MANGANESE NODULES.

Authors:  OCTAVIAN G. DULIU, ANA C. DANIS, STEFAN A. SZOBOTKA. 		 
       
         
  Abstract:  The geological age of a manganese nodule, collected from the Clarion-Clipperton region of the North Pacific Region has been determined by means of 230Th and 231Paexcess radiometric methods. The distribution of the α-activity over a transverse section of the nodule has been performed by using cellulose-acetate CR 37 detectors, while the concentration of the fissile elements has been achieved, for the same section, by means of muscovite detectors, following neutron irradiation. For both cases we have obtained a map of trace distribution, whose density is higher on marginal zones and decreases gradually towards the background for the lower part of the nodule and abruptly for the upper one. By taking into account the radial distribution of traces, we have calculated for the external layers, rich in traces, an average growth rate of 20 mm/Ma. More details are presented concerning the experimental technique as well as the peculiarities of trace distribution over the entire investigated section.  
         
     
         
         
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