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doi:10.2204/iodp.proc.322.204.2013

Data report: amorphous silica content of sediment from Sites C0011 and C0012 in the Shikoku Basin on the NanTroSEIZE transect¹

Glenn A. Spinelli² and Ashley Hutton²

Abstract

We determined the amorphous silica content of sediment from two sites in Shikoku Basin along the Nankai Trough Seismogenic Zone Experiment transect, offshore southern Japan. We examined hemipelagic mud from Sites C0011 and C0012 cored during Expeditions 322 and 333 of the Integrated Ocean Drilling Program. We determined amorphous silica content using an alkaline leaching technique. Amorphous silica content is ≤1.1 wt% in all samples. Amorphous silica content is higher in the shallow sediment (lithologic Subunit IA) than in the deeper sediment. At Site C0011, amorphous silica content decreases from 0.75–1.10 wt% in Subunit IA (above 252 meters below seafloor [mbsf]) to 0.13–0.59 wt% in deeper lithologic units (below 252 mbsf). At Site C0012, four samples from Subunit IA contain 0.58–0.66 wt% amorphous silica; samples from deeper lithologic units contain 0.13–0.40 wt% amorphous silica.

¹ Spinelli, G.A., and Hutton, A., 2013. Data report: amorphous silica content of sediment from Sites C0011 and C0012 in the Shikoku Basin on the NanTroSEIZE transect. In Saito, S., Underwood, M.B., Kubo, Y., and the Expedition 322 Scientists, Proc. IODP, 322: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.322.204.2013

² Earth and Environmental Science Department, New Mexico Institute of Mining and Technology, Socorro NM 87801, USA.
Correspondence author: spinelli@nmt.edu

Initial receipt: 30 May 2012
Acceptance: 12 November 2012
Publication: 22 January 2013
MS 322-204

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