RELATIONSHIP BETWEEN ACCRETION OF MANGANESE NODULES AND SEDIMENTARY ENVIRONMENTS

Luo Shangde; Wang Lei; Huang Yipu

48 data sets on the major chemical compositions (Mn and Fe concentrations) and growth rates of manganese nodules from different sedimentary environments of the oceans have been collected and their fluxes of manganese and iron have been calculated. It has been shown that although the chemical compositions and growth rates of manganese nodules from different areas of the oceans are largely different ( Mn: 11.3-44.9% ； Fe: 0.724-20.5% ； growth rates； 0.8O-2OOmm/10⁶yr) , there are small differences in Fe fluxes (10-10²mg Fe/cm² ? 10⁶yr at most) but large one in Mn fluxes (in range of 10 to 10⁴mg Mn/cm² ? 10⁶yr) ， reflecting that the diagenetic reactivity of manganese is much stronger than that of iron in marine environments. It has been demonstrated by statistical analyses the (I) the concentrations of manganese and iron of individual nodules are correlative positively for the nodules with the Mn /Fe ratios of ?1 but negatively for those with high Mn /Fe ratios becauce of different contribution of diagenetic manganese; (2) The relationships of Mn fluxes to Fe fluxes or Mn /Fe ratios of the manganese nodules are dependent on classification of sedimentary environments, but the changes of Mn fluxes and Mn /Fe ratios caused only by diagenetic processes are linearly correlative, independent on the classification of sedimentary environments. The following equation, derived from the correlation of Mn fluxes to Mn /Fe ratios of manganese modules, can be used to predict the growth rates from the Mn concentrations and Ma/Fe ratios of the nodules and reveal the importance of sedimentary environments to the chemical composition and growth rate of manganese nodules: S(mm/10⁶yr) =[52.0(Mn/Fe-0.6O)¹²⁵+ 10]/[Mn]

RELATIONSHIP BETWEEN ACCRETION OF MANGANESE NODULES AND SEDIMENTARY ENVIRONMENTS

Department of Oceanography, Xiamen University, Xiamen

Received Date: 1987-07-28

Publish Date: 1989-12-10

Abstract: 48 data sets on the major chemical compositions (Mn and Fe concentrations) and growth rates of manganese nodules from different sedimentary environments of the oceans have been collected and their fluxes of manganese and iron have been calculated. It has been shown that although the chemical compositions and growth rates of manganese nodules from different areas of the oceans are largely different ( Mn: 11.3-44.9% ； Fe: 0.724-20.5% ； growth rates； 0.8O-2OOmm/10⁶yr) , there are small differences in Fe fluxes (10-10²mg Fe/cm² ? 10⁶yr at most) but large one in Mn fluxes (in range of 10 to 10⁴mg Mn/cm² ? 10⁶yr) ， reflecting that the diagenetic reactivity of manganese is much stronger than that of iron in marine environments. It has been demonstrated by statistical analyses the (I) the concentrations of manganese and iron of individual nodules are correlative positively for the nodules with the Mn /Fe ratios of ?1 but negatively for those with high Mn /Fe ratios becauce of different contribution of diagenetic manganese; (2) The relationships of Mn fluxes to Fe fluxes or Mn /Fe ratios of the manganese nodules are dependent on classification of sedimentary environments, but the changes of Mn fluxes and Mn /Fe ratios caused only by diagenetic processes are linearly correlative, independent on the classification of sedimentary environments. The following equation, derived from the correlation of Mn fluxes to Mn /Fe ratios of manganese modules, can be used to predict the growth rates from the Mn concentrations and Ma/Fe ratios of the nodules and reveal the importance of sedimentary environments to the chemical composition and growth rate of manganese nodules: S(mm/10⁶yr) =[52.0(Mn/Fe-0.6O)¹²⁵+ 10]/[Mn]

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Reference (13)

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RELATIONSHIP BETWEEN ACCRETION OF MANGANESE NODULES AND SEDIMENTARY ENVIRONMENTS

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