大洋多金属结核中几种常见锰矿相的特征及其相关性

大洋多金属结核中的1 nm锰矿相常以陆上钡镁锰矿命名,但两者在晶体结构等方面有很大的差别,并不属同一种矿物,1 nm锰矿相与人工合成的布塞尔矿却有更多的相似性。1 nm锰矿相会因干燥失水而相变成0.7 nm锰矿相,因此结核中的大多数0.7 nm锰矿相很可能不是原生矿物,而仅仅是1 nm锰矿相的相变产物。水羟锰矿和1 nm锰矿相是多金属结核中最主要的两种锰矿物,它们两者均有0.24 nm和0.14 nm这两条特征X射线衍射峰,因此在对结核进行锰矿物相的鉴定中要注意把它们区分开。

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.