THE MAIN MANGANATES IN THE POLYMETALLIC NODULES AND THEIR CORRELATIONS

The crystal structure of the marine 1nm manganate is quite different with that of the land base todorokite,and it has more similarities with the synthetic 1 nm manganate of buserite instead,therefore the marine 1 nm manganate and todorokite are the distinct manganates.The 1nm manganate can be transformed into 0.7 nm manganate by losing some water caused by drying,and the 0.7 nm manganate might not be the original manganate phase in polymetallic nodules,but is more likely to be the phase transformation product of 1 nm manganate.Vernadite and 1 nm manganate are the two main manganates in the polymetallic nodules,they both have the characteristic X ray diffraction pattern in 0.24 nm and 0.14 nm,therefore much attention should be paid in order to distinguish these two manganates during mineral analysis.