Chemical analyses of manganese nodules from the the Pacific Ocean determined by wet chemistry and X-ray fluoresence

A variety of manganese nodules from the Pacific Ocean were selected from dredge performed during various ship cruises of the Scripps Institution of Oceanography (SIO. For Mn and Fe the analyses were made using wet chemical techniques by the U.S. Bureau of Mines The analyses of all the other elemnts were made by an X-ray fluorescence technique following a drying of the samples at 200°C. The metal concentrations are presented reduced to a detrital mineral free basis. SiO2, Al2O3, and H2O were considered as detrital parts. Reduced percents are used to allow better definition of the compositional regions.