Cerium; a chemical tracer for paleo-oceanic redox conditions

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doi: 10.1016/0016-7037(88)90207-4
Author(s): Liu, Y. G.; Miah, M. R. U.; Schmitt, R. A.
Author Affiliation(s): Primary:
Oreg. State Univ., Dep. Chem., Corvallis, OR, United States
Other:
Calif. Inst. Technol., United States
Univ. Calif., Los Angeles, United States
Bangladesh At. Energy Establ., Bangladesh
Volume Title: Conference on Isotope tracers in geochemistry and geophysics
Volume Author(s): Zartman, Robert E., prefacer; Papanastassiou, Dmitri A.; DePaolo, Donald J.
Source: Geochimica et Cosmochimica Acta, Vol.52, p.1361-1371; Isotope tracers in geochemistry and geophysics, Pasadena, CA, Mar. 23-25, 1987, prefaced by Robert E. Zartman, Dmitri A. Papanastassiou and Donald J. DePaolo. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037 CODEN: GCACAK
Note: In English. 47 refs.; illus. incl. 3 tables
Summary: A simple model for the mechanism of Ce oxidation and of the relation of Ce concentration to the CO2 partial P of the upper part of the oceans, is presented. Theoretical considerations include the derivation of equations for Ce redox in sea-water. Ce anomalies are illustrated for DSDP Leg 72 (Rio Grande Rise) and Leg 74 (Walvis Ridge), South Atlantic, as a function of the sub-bottom depths of samples. Elemental concentrations are tabulated for sediment samples from DSDP Leg 103 (Galicia margin), North Atlantic, and for sediments from DSDP Hole 316, 2300 km S of Hawaii, central Pacific. Data for the South Atlantic indicate from the Ce anomalies that the entire South Atlantic water redox changed from reducing to oxidizing at 56 m.y., while in the North Atlantic the change occurred from 132-148 m.y. indicating active surface currents between the Atlantic and the shallow sea off the Iberian peninsula. The relative enrichment of Ce in samples from the central Pacific is attributed to coprecipitation of Ce(OH)4 onto Fe-Mn-O coatings. The importance of phosphate in the Ce anomalies, and implications of the model for palaeoenvironmental studies are discussed.
Year of Publication: 1988
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Apatite; Atlantic Ocean; Carbonate rocks; Cenozoic; Cerium; DSDP Site 316; Deep Sea Drilling Project; Eh; Galicia Bank; Geochemistry; IPOD; Leg 103; Leg 33; Leg 72; Leg 74; Limestone; Mesozoic; Metals; North Atlantic; Northeast Atlantic; Ocean Drilling Program; PH; Paleo-oceanography; Phosphates; Properties; Rare earths; Sea water; Sedimentary rocks; Tethys; Trace elements; Tracers
Record ID: 1988053062
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom

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