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8287359 
Journal Article 
Preliminary studies of manganese-rich carbonate nodules from Leg 68, site 503, eastern equatorial Pacific 
Coleman, M; Fleet, A; Donson, P 
1982 
68 
481-489 
English 
The XRD and microprobe studies reveal calcian rhodochrosite and minor calcite. Mn ranges up to 30%. The isotope data suggest that C derived from sea-water was mixed with C produced by organic diagenesis. -K.A.R.