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doi:10.2204/iodp.proc.348.202.2016

Data report: clay mineral assemblages in cores from Hole C0002P, IODP Expedition 348, Nankai Trough accretionary prism¹

Michael B. Underwood² and Chen Song³

Abstract

This report summarizes the results of X-ray diffraction analyses of core samples from Integrated Ocean Drilling Program Hole C0002P. Twenty-three specimens were collected from the Nankai accretionary prism over a depth interval of 2163 to 2218 meters below seafloor. Analyses of the <2 mm size fraction show considerable amounts of variation in relative mineral abundances. Percentages of clay-size smectite average 39.5 wt% (standard deviation of 17.9). Percentages of illite and kaolinite + chlorite average 32.4 and 25.1 wt%, respectively (standard deviations of 8.5 and 7.8). Values of illite/smectite expandability average 70%, and the percentage of illite in illite/smectite mixed-layer clays averages 41%. Values of illite crystallinity index are consistent with advanced levels of diagenesis to anchizone metamorphism within detrital source areas.

¹ Underwood, M.B., and Song, C., 2016. Data report: clay mineral assemblages in cores from Hole C0002P, IODP Expedition 348, Nankai Trough accretionary prism. In Tobin, H., Hirose, T., Saffer, D., Toczko, S., Maeda, L., Kubo, Y., and the Expedition 348 Scientists, Proceedings of the Integrated Ocean Drilling Program, 348: College Station, TX (Integrated Ocean Drilling Program).
doi:10.2204/iodp.proc.348.202.2016

² Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA.
UnderwoodM@missouri.edu

³ Department of Geological Sciences, University of Missouri, Columbia, Missouri, USA.

Initial receipt: 1 March 2016
Acceptance: 26 July 2016
Publication: 30 November 2016
MS 348-202

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