Rare earth element deposition in pelagic sediment at the Cenomanian-Turonian Boundary, Exmouth Plateau

Details Rare earth element deposition in pelagic sediment at the Cenomanian-Turonian Boundary, Exmouth Plateau Rare earth element deposition in pelagic sediment at the Cenomanian-Turonian Boundary, Exmouth Plateau

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..203d&link_type=abstract

Geopysical Research Letters (ISSN 0094-8276), vol. 22, no. 3, p. 203-206

Physics

1

Drilling, Geochemistry, Indian Ocean, Mineral Deposits, Mineral Exploration, Ocean Bottom, Rare Earth Elements, Sediments, Cerium, Cretaceous Period, Iron, Manganese, Oxygenation, Pelagic Zone

Scientific paper

Ocean Drilling Program (ODP) Site 762 (eastern Indian Ocean) includes a section of sediment that spans the Cenomanian-Turonian Boundary (CTB) and was deposited along a continental margin during a period of widespread oceanic O2 deficiency. The rare earth element (REE) content of pre- and post-boundary sediment is similar to that of present-day continental slope material deposited in well-oxygenated seawater, whereas the CTB section is characterized by significantly depleted REE abundances, a bulk Ce anomaly that increases to maximum of 1.0, and a REE pattern that resembles that of present-day fluvial material. We suggest the change in REE patterns reflects release of scavenged REEs upon reductive dissolution of authigenic Fe-Mn oxyhydroxides, such that sediment deposited during the CTB is dominated by the lithogeneous REE fraction. These results are consistent with recent models concerning pervasive fractionation of Mn and Fe and redirection of Mn in pelagic CTB waters.

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