Takashima, Chizuru et al. (2009): Data report; Geochemical characterization of a lithified horizon of Challenger Mound, Hole U1317B

Leg/Site/Hole:
IODP 307
IODP 307 U1317
Identifier:
2009-060811
georefid
10.2204/iodp.proc.307.201.2009
doi
Creator:
Takashima, Chizuru
Kyushu University, Graduate School of Social and Cultural Studies, Fukuoka, Japan
author
Hori, Masako
Hiroshima University, Japan
author
Kano, Akihiro
Lamont-Doherty Earth Observatory, United States
author
Identification:
Data report; Geochemical characterization of a lithified horizon of Challenger Mound, Hole U1317B
2009
In: Ferdelman, Timothy, Kano, Akihiro, Williams, Trevor, Gaillot, Philippe, Abe, Kohei, Andres, Miriam S., Bjerager, Morten, Browning, Emily L., Cragg, Barry A., De Mol, Ben, Foubert, Anneleen, Frank, Tracy D., Fuwa, Yuji, Gharib, Jamshid J., Gregg, Jay M., Huvenne, Veerle Ann Ida, Leonide, Philippe, Li Xianghui, Mangelsdorf, Kai, Novosel, Ivana, Sakai, Saburo, Samarkin, Vladimir A., Sasaki, Keiichi, Spivack, Arthur J., Takashima, Chizuru, Tanaka, Akiko, Titschack, Juergen, Proceedings of the Integrated Ocean Drilling Program; modern carbonate mounds; Porcupine drilling; Expedition 307 of the riserless drilling platform; Dublin, Ireland, to Mobile, Alabama; Sites U1316-U1318, 25 April-30 May 2005
IODP Management International, Washington, DC, United States
307
The sediments of Challenger Mound, drilled during Integrated Ocean Drilling Program Expedition 307, show alternations of darker and lighter colored layers in approximately 10 m intervals. Lithified horizons often observed in the lighter layers were interpreted as deposits of interglacial periods. We performed high-resolution analysis of minor elements (Mg and Sr) and stable isotopes for 33 cm long sections that contain lithified horizons. The Sr/Ca ratio, carbonate content, and oxygen and carbon stable isotopes show significant correlation to one another. We also observed mottled parts composed of framboidal pyrites at the levels where carbonate contents and Sr/Ca ratios are high. The results suggest an association among coral skeletons, bacterial sulfate reduction, and carbonate precipitation. It is suggested that sulfate-reducing bacteria were responsible for decomposing organic matter in coral skeletons and induced the precipitation of carbonate.
English
Serial
Coverage:Geographic coordinates:
North:51.2300
West:-11.4300East: -11.4300
South:51.2300
Stratigraphy; Isotope geochemistry; alkaline earth metals; Atlantic Ocean; bacteria; biogenic processes; boreholes; C-13/C-12; calcium; carbon; carbonate sediments; Cenozoic; Challenger Mound; chemostratigraphy; cores; deep-sea environment; depositional environment; Expedition 307; framboidal texture; geochemistry; glacial environment; horizons; Integrated Ocean Drilling Program; interglacial environment; IODP Site 1317; isotope ratios; isotopes; lithification; lithostratigraphy; lower Pleistocene; marine environment; marine sediments; metals; Neogene; North Atlantic; Northeast Atlantic; O-18/O-16; oxygen; Pleistocene; Pliocene; Porcupine Seabight; pyrite; Quaternary; reduction; sediments; Sr/Ca; stable isotopes; strontium; sulfides; Tertiary; textures; upper Pliocene;
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