Takashima, Chizuru; Hori, Masako; Kano, Akihiro (2009): Data report; Geochemical characterization of a lithified horizon of Challenger Mound, Hole U1317B. IODP Management International, Washington, DC, United States, 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, 307, georefid:2009-060811

Abstract:
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.
Coverage:
West: -11.4300 East: -11.4300 North: 51.2300 South: 51.2300
Relations:
Expedition: 307
Site: 307-U1317
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2204/iodp.proc.307.201.2009 (c.f. for more detailed metadata)
Data download: application/pdf
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