Выпуск: 1-2 , Том: 603 , Год издания: 2009

The distributions of ore elements (Mn, Fe) and 20 chemical "trace" elements in a ferromanganese nodule from underwater Magellan mountains (Pacific Ocean) have been Studied with scanning X-ray fluorescence analysis using synchrotron radiation (XRF-SR) with the scanning step of 400 μm. The nodule is characterized by the low phosphorus content (less than 1.0). The variability of concentrations of the most elements including Mn and Fe from periphery to the nodule center is less than 15%. For all points of a scanning profile, the positive Ce-h/Ce-h* anomaly is evident, the spread in values being in the range 1.14-1.85. The Fe/Mn-modulus and values of the Ce-h/Ce-h* anomaly have, as a whole, the negative correlation, however, their imperfect out-of-phase distributions allow one to assume three competing ways for supply Mn into a nodule: from hydrothermal waters, as well as from bulk ocean water and underlying bottom sediment. (C) 2008 Elsevier B.V. All rights reserved.