Postdepositional mobility of some transition elements, phosphorus, uranium and thorium in deep sea sediments

Details Postdepositional mobility of some transition elements, phosphorus, uranium and thorium in deep sea sediments Postdepositional mobility of some transition elements, phosphorus, uranium and thorium in deep sea sediments

Feb 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35..189b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 35, Issue 2, pp.189-201

Computer Science

22

Scientific paper

Deep sea hemipelagic sediments from the east Pacific show an oxidized upper zone of variable thickness and a reduced zone below. The geochemistry of a core from this region was studied in detail. The Eh of the upper zone is close to + 100 mV, while in the lower zone it reaches about -400 mV. Reducing conditions in the lower section of the core are related to the oxidation of organic matter in the sediment, as indicated by the gradual decrease with depth of the concentration of nitrogen in the upper part of the core. Various elements, such as Mn, Ni, Co, P and La, are enriched in the upper oxidized zone, while Cr, V, U and S are enriched in the lower reduced zone. Postdepositional mobility of the elements in question, mainly by diffusion in the interstitial solutions, can explain their distribution in the core. Redox reactions can account directly for the mobilization of Mn, Ni, Co, Cr, V and U, indirectly for that of P and La. Fe and Cu do not migrate significantly, since they are immobilized as sulfides in the reduced zone. Th appears not to be affected by diagenetical mobility. Some of the consequences of the Postdepositional mobility of elements in deep sea sediments are: 1. (1) The average elemental content of deep sea sediment, generally estimated from measurements of samples from the upper part of the sediment column, may be affected by errors; namely, an overestimation in the case of Mn, Ni, Co, P and La; an underestimation in the case of V, Cr and U. 2. (2) Postdepositional redistribution of U may introduce errors in age determinations of sediments by the Th 230 / Th 232 and Th 230 / Pa 231 methods. 3. (3) Some geographical variations in the composition of Fe-Mn nodules can be explained by postdepositional mobility of Mn, Ni and Co.

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