Fukukawa, M.; Takahashi, Y.; Hayasaka, Yasutaka; Sakai, Y.; Shimizu, H. (2003): Geochemical study of ODP Leg 191 Site 1179 sediments; direct observation of Mn and Ce oxidation states. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Sager, William W., Kanazawa, Toshihiko, Escutia, Carlota, Araki, Eiichiro, Arney, James E., Carlson, Richard L., Downey, Warna S., Einaudi, Florence, Haggas, Sarah L., Hayasaka, Yasutaka, Hirata, Kenji, Horner-Johnson, Benjamin C., Mandernack, Kevin W., McCarthy, Francine M. G., Moberly, Ralph, Mochizuki, Masashi, Pedersen, Rikke Ohlenschlaeger, Salimullah, Ali R. M., Shinohara, Masanao, Werner, Carl-Dietrich, Proceedings of the Ocean Drilling Program; scientific results; Northwest Pacific Seismic Observatory and hammer drill tests; covering Leg 191 of the cruises of the drilling vessel JOIDES Resolution; Yokohama, Japan, to Apra Harbor, Guam; Sites 1179-1182; 16 July-8 September 2000, 191, georefid:2005-072227

Depth profiles of major element and rare earth element (REE) abundances in sediment samples (mainly siliceous ooze and clay) recovered from Holes 1179B and 1179C at Site 1179, Ocean Drilling Program Leg 191 (41.4 degrees N, 159.6 degrees E) were determined. The oxidation states of Mn and Ce were determined by X-ray absorption near-edge structure. Some geochemical indicators were tested, including the MnO/TiO (sub 2) ratios, a bivariate diagram of La/Ce vs. Al (sub 2) O (sub 3) /(Al (sub 2) O (sub 3) +Fe (sub 2) O (sub 3) ), and other discrimination diagrams. The oxidation state of Mn is reduced Mn(II) in the depth profile below 0.60 meters below seafloor (mbsf), which is consistent with relatively low and high abundances of Mn in the sediments and pore waters, respectively. It is possible that the diagenetic effect on the oxidation state and abundance of Mn makes it difficult for the MnO/TiO (sub 2) ratio to reflect the depositional environment. The normalized ratio of La and Ce does not change very much with depth, suggesting that the diagenetic effect does not affect the REE signature in the sediments. On the diagram of La/Ce vs. Al (sub 2) O (sub 3) /(Al (sub 2) O (sub 3) +Fe (sub 2) O (sub 3) ), the sediments studied here plot at the boundary of the pelagic and continental margin fields. This suggests that continental material has contributed to the sediment to some degree, even though Site 1179 is in a pelagic region of the northwestern Pacific Ocean, >1600 km from Japan.
West: 159.5700 East: 159.5800 North: 41.0500 South: 41.0400
Expedition: 191
Site: 191-1179
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Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.191.007.2004 (c.f. for more detailed metadata)
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