Manganese abundance data

Remark Manganese ore contains about 40% manganese (Source of production data http //minerals.usgs.gOv/minerals/pubs/commodity/statistical summary/mybl-2006-stati.pdf Source of abundance data Geological handbook, Heibon-sha, Tokyo, Japan)... 

Dissolved arsenic is correlated with ammonia (Fig. 4), consistent with a release mechanism associated with the oxidation of organic carbon. Other chemical data not shown here provide clear evidence of iron, manganese and sulfate reduction and abundant methane in some samples indicates that methanogenesis is also occurring. It is not clear however if arsenic is released primarily by a desorption process associated with reduction of sorbed arsenic or by release after the reductive dissolution of the iron oxide sorbent. Phreeqc analysis shows PC02 between 10"12 and 10"° bars and that high arsenic waters are supersaturated with both siderite and vivianite. 

Manganese Two recent studies give A(Mn) = 5.37 0.05 [57] and 5.36 0.10 [58] and [3] found the same value as [57]. These values are only slightly lower than the value 5.39 0.03 given in L03. The analyses of the photospheric Mn abundance seem to confirm that the photospheric Mn abundance is lower than the meteoritic value of 5.50 0.01. Assuming that indeed both the photospheric and meteoritic data are reliable, the cause of this abundance difference must be found. 

---