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doi:10.2204/iodp.proc.307.209.2009

Data report: three-dimensional observation and quantification of internal structure of sediment core from Challenger Mound area in Porcupine Seabight off western Ireland using a medical X-ray CT1

Akiko Tanaka2 and Tsukasa Nakano2

Abstract

Three sites on and near Challenger Mound, a carbonate mound structure covered with dead deepwater coral rubble in Porcupine Seabight on the southwest Irish continental margin, were drilled during Integrated Ocean Drilling Program Expedition 307 in May 2005. In addition to the mound, one site immediately downslope of Challenger Mound and an upslope site were drilled to constrain the stratigraphic framework of the slope/​mound system and to identify and correlate erosional surfaces. X-ray computerized tomography (CT) was used to image 6 m long half-round cores recovered from an off-mound site. X-ray CT visualizes three-dimensional (3-D) distribution of X-ray linear absorption coefficients of samples and allows examination of 3-D measurements of complex shapes of corals fragments and dropstones in sedimentary sequences.

1 Tanaka, A., and Nakano, T., 2009. Data report: three-dimensional observation and quantification of internal structure of sediment core from Challenger Mound area in the Porcupine Seabight off western Ireland using a medical X-ray CT. In Ferdelman, T.G., Kano, A., Williams, T., Henriet, J.-P., and the Expedition 307 Scientists, Proc. IODP, 307: Washington, DC (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/​iodp.proc.307.209.2009

2 Geological Survey of Japan, AIST, Tsukuba Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan. Correspondence author: akiko-tanaka@aist.go.jp

Initial Receipt: 7 August 2008
Acceptance: 19 October 2008
Publication: 3 April 2009
MS 307-209