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doi:10.2204/iodp.proc.311.208.2008

Data report: clay mineralogical composition of northern Cascadia margin sediments, IODP Expedition 311¹

Danièle Bartier,² Marie-Madeleine Blanc-Valleron,² Jean Marie Rouchy,² and Catherine Pierre³

Abstract

The clay mineralogical semiquantitative composition of 186 samples of hemipelagic sediments, turbiditic sediments, and authigenic carbonates from Integrated Ocean Drilling Program Sites U1325–U1329, northern Cascadia margin, were determined by X-ray diffraction analyses. Oriented aggregates of clay-sized fractions were analyzed to estimate the relative percentages of smectite, illite, chlorite, kaolinite, and illite/vermiculite mixed layers. Illite/vermiculite mixed layers were observed for the first time in this area. Clay mineral assemblages show only modest long-term variations with no significant differences among Sites U1325–U1329. Variations in clay mineral assemblages are supposed to be mostly related to differences between hemipelagic sediments and turbiditic sediments. The sampling resolution and the age control are not good enough to define or recognize any climate control indicators in the clay mineral record.

¹Bartier, D., Blanc-Valleron, M.-M., Rouchy, J.M., and Pierre, C., 2008. Data report: clay mineralogical composition of northern Cascadia margin sediments, IODP Expedition 311. In Riedel, M., Collett, T.S., Malone, M.J., and the Expedition 311 Scientists, Proc. IODP, 311: Washington, DC (Integrated Ocean Drilling Program Management International, Inc.).
doi:10.2204/iodp.proc.311.208.2008

²UMR 5143 CNRS, Département Histoire de la Terre—Géologie, Muséum National d'Histoire Naturelle, 43 rue Buffon, 75005 Paris, France.
Correspondence author: bartier@mnhn.fr

³CNRS-LOCEAN, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France.

Initial receipt: 26 June 2008
Acceptance: 5 September 2008
Publication: 17 November 2008
MS 311-208

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