Other
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004gecoa..68.2485s&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 68, Issue 11, p. 2485-2493.
Other
17
Scientific paper
The concentrations of authigenic phases of Cd, Re, U, and Mo increase with depth in four 45-cm-long sediment box cores collected along the axis of the Laurentian Trough, Gulf of St. Lawrence. Average authigenic accumulation rates, estimated from element inventories, are similar to rates in other continental margin environments. Strong regional variations in sediment accumulation rate and sulfide concentration have little influence on the accumulation rates of Cd and Re. This suggests that slow precipitation kinetics controls the accumulation of Cd and Re in these sediments. The accumulation rate of authigenic U is more variable; it may be tied to the kinetics of microbially mediated U reduction and be controlled by the availability of reactive organic matter. Authigenic Mo is distinguished by a sharp subsurface concentration minimum, above which Mo cycles with manganese. Mo released to pore water upon reduction of Mn oxides diffuses downward and enriches the subsurface sediment. Mo accumulates most rapidly in the sediment with the highest sulfide content. Slow conversion of molybdate to thiomolybdate may explain the much slower Mo accumulation rate in the less sulfidic sediments. A component of authigenic Mo accumulates with pyrite in an approximately constant Mo:Fe ratio. The accumulation rate of pyrite and associated Mo is insensitive to AVS abundance. Pyrite formation may be limited by the reactivity of iron oxide minerals.
Gobeil Charles
Martinez Philippe
Sundby Bjørn
No associations
LandOfFree
Comparative geochemistry of cadmium, rhenium, uranium, and molybdenum in continental margin 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 Comparative geochemistry of cadmium, rhenium, uranium, and molybdenum in continental margin sediments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comparative geochemistry of cadmium, rhenium, uranium, and molybdenum in continental margin sediments will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-895655