Reusch, Douglas N. (2003): Oligocene-Miocene terrigenous and pelagic sediments, Skiff Bank, Kerguelen Plateau (ODP Leg 183, Site 1139). Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Frey, Frederick A., Coffin, Millard F., Wallace, Paul J., Antretter, Maria J., Arndt, Nicholas T., Barling, Jane, Boehem, Florian, Borre, Mai Kirstine, Coxall, Helen K., Damuth, John E., Delius, Heike, Duncan, Robert A., Inokuchi, Hiroo, Keszthelyi, Laszlo, Mahoney, John J., Moore, C. Leah, Mueller, R. Dietmar, Neal, Clive R., Nicolaysen, Kirsten E., Pringle, Malcolm S., Reusch, Douglas N., Saccocia, Peter J., Teagle, Damon A. H., Waehnert, Veronika, Weis, Dominique A. M., Wise, Sherwood W., Zhao, Xixi, Quilty, Patrick G. (editor), Proceedings of the Ocean Drilling Program; scientific results; Kerguelen Plateau-Broken Ridge; a large igneous province; covering Leg 183 of the cruises of the drilling vessel JOIDES Resolution; Fremantle, Australia, to Fremantle, Australia; Sites 1135-1142; 7 December 1998-11 February 1999, 183, georefid:2006-060012

Mixed terrigenous-pelagic sediments from the Oligocene-lower Miocene interval of Hole 1139A accumulated on the flank of an eroded alkalic volcano, Skiff Bank. In this study, I explore relationships among sediment fluxes, especially of organic carbon and the clay mineral by-products of silicate weathering, and lithologic, tectonic, climatic, and biologic forcing factors. Benthic foraminifers indicate that Skiff Bank had subsided to lower bathyal depths (1000-2000 m) by the Oligocene. Two prominent maxima in noncarbonate concentration at 28 and 22 Ma correspond to peaks in the terrigenous flux; also, high noncarbonate concentrations are associated with larger grain sizes (silt) and higher opal concentrations. These and higher-frequency variations of noncarbonate concentration were probably controlled by glacioeustatic/climatic changes, with higher noncarbonate concentrations caused by increased erosion during glacial lowstands. Around 27 Ma, benthic foraminiferal 18O values decreased 0.7 as the noncarbonate concentration decreased after the 28-Ma maximum. A paucity of clay-sized sediment and clay minerals suggests that physical erosion, by waves and/or ice, predominated under weathering-limited conditions. Low organic carbon concentrations ( approximately 0.13 wt%) also suggest a harsh environment and/or poor preservation in coarse (>2 mu m) sediments that were extensively bioturbated below the oxygen minimum zone.
West: 63.5612 East: 63.5612 North: -50.1106 South: -50.1106
Expedition: 183
Site: 183-1139
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