BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN
Online ISSN : 2186-490X
Print ISSN : 1346-4272
ISSN-L : 1346-4272
Volume 66 , Issue 7-8
Bulletin of the Geological Survey of Japan
Showing 1-2 articles out of 2 articles from the selected issue
Article
  • Yutaka Kanai
    2015 Volume 66 Issue 7-8 Pages 159-167
    Published: November 18, 2015
    Released: January 19, 2016
    JOURNALS FREE ACCESS
    Carbonatite ore deposits attract much attention as resources of Nb and rare earth elements. Analytical method of uranium in weathered carbonatite ore deposit in Brazil was studied. The KOH fusion, which is used for the determination of U in rock samples, is proved to be applicable to the decomposition of such samples. The gamma-spectrometry is non-destructive and suitable for samples containing insoluble minerals. The ICP analysis combined with acid decomposition might produce low results owing to the insufficient decomposition of samples. The KOH fusion–fluorimetry method was applied to the weathered carbonatite samples taken from Brazil and good results were obtained. U contents ranged from 10 to 1200ppm, which are higher than the average contents of rocks and soils. U seemed to be concentrated during the weathering process.
    Download PDF (925K)
Report
feedback
Top