Rare earth element geochemistry of oceanic ferromanganese nodules and associated sediments

Details Rare earth element geochemistry of oceanic ferromanganese nodules and associated sediments Rare earth element geochemistry of oceanic ferromanganese nodules and associated sediments

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..513e&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Issue 4, pp.513-528

Other

35

Scientific paper

Analyses have been made of REE contents of a well-characterized suite of deep-sea (> 4000 m.) principally todorokite-bearing ferromanganese nodules and associated sediments from the Pacific Ocean. REE in nodules and their sediments are closely related: nodules with the largest positive Ce anomalies are found on sediments with the smallest negative Ce anomalies; in contrast, nodules with the highest contents of other rare earths (3 + REE) are found on sediments with the lowest 3 + REE contents and vice versa. 143 Nd / 144 Nd ratios in the nodules (~0.51244) point to an original seawater source but an identical ratio for sediments in combination with the REE patterns suggests that diagenetic reactions may transfer elements into the nodules. Analysis of biogenic phases shows that the direct contribution of plankton and carbonate and siliceous skeletal materials to REE contents of nodules and sediments is negligible. Inter-element relationships and leaching tests suggest that REE contents are controlled by a P-rich phase with a REE pattern similar to that for biogenous apatite and an Fe-rich phase with a pattern the mirror image of that for sea water. It is proposed that 3 + REE concentrations are controlled by the surface chemistry of these phases during diagenetic reactions which vary with sediment accumulation rate. Processes which favour the enrichment of transition metals in equatorial Pacific nodules favour the depletion of 3 + REE in nodules and enrichment of 3 + REE in associated sediments. In contrast, Ce appears to be added both to nodules and sediments directly from seawater and is not involved in diagenetic reactions.

Affiliated with

Also associated with

No associations

Rating

Rare earth element geochemistry of oceanic ferromanganese nodules and associated sediments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Rare earth element geochemistry of oceanic ferromanganese nodules and associated sediments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rare earth element geochemistry of oceanic ferromanganese nodules and associated sediments will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-782291