Molybdenum in marine deposits

Computer Science

Scientific paper

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Scientific paper

The distribution and rates of accumulation of Mo in marine deposits have been determined and compared with the same parameters for U and Mn. High concentrations of Mo are associated both with oxidizing environments represented by the presence of ferro-manganese oxide-rich sediments (where Mo/U ~- 3) and with reducing environments (where Mo/U is about unity). The supply of Mo by streams is more than adequate to balance the measured removal rate in normal deep-sea deposits and no submarine volcanic `emanations' need be involved. On an ocean-wide basis, 4 · 3 g Mo/cm 2 /1000 yr is supplied in solution by streams. Of this, 2·0 g Mo/cm 2 /1000 yr is removed in deep-sea sediments and manganese nodules. The remaining 2·3 g Mo/cm 2 /1000 yr is probably removed in primarily (but not exclusively) near-shore reducing sediments. The average Mo accumulation rate in these environments is about 1000 g Mo/cm 2 /1000 yr; thus only 0·23 per cent of the world ocean area need be such reducing sites.

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