Data report; Clay mineral assemblages in cuttings from Hole C0002N, IODP Expedition 348, Nankai Trough accretionary prism

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DOI: 2204/iodp.proc.348.203.2017
Author(s): Underwood, Michael B.
Integrated Ocean Drilling Program, Expedition 348 Scientists, College Station, TX
Author Affiliation(s): Primary:
New Mexico Institute of Mining and Technology, Department of Earth and Environmental Sciences, Socorro, NM, United States
Volume Title: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 3; NanTroSEIZE plate boundary deep riser 3; Expedition 348 of the riser drilling platform from and to Shimizu, Japan; Site C0002, 13 September 2013-20 January 2014
Volume Author(s): Tobin, Harold; Hirose, Takehiro; Saffer, Demian; Toczko, Sean; Maeda, Lena; Kubo, Yusuke; Sanada, Yoshinori; Kido, Yukari; Hamada, Yohei; Boston, Brian; Broderick, Aisling; Brown, Kevin; Crespo-Blanc, Ana; Even, Emilie; Fuchida, Shigeshi; Fukuchi, Rina; Hammerschmidt, Sebastian; Henry, Pierre; Josh, Matthew; Jurado, María José; Kitajima, Hiroko; Kitamura, Manami; Maia, Ana; Otsubo, Makoto; Sample, James; Schleicher, Anja; Sone, Hiroki; Song, Chen; Valdez, Robert; Yamamoto, Yuzuru; Yang, Kiho
Source: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 3; NanTroSEIZE plate boundary deep riser 3; Expedition 348 of the riser drilling platform from and to Shimizu, Japan; Site C0002, 13 September 2013-20 January 2014, Harold Tobin, Takehiro Hirose, Demian Saffer, Sean Toczko, Lena Maeda, Yusuke Kubo, Yoshinori Sanada, Yukari Kido, Yohei Hamada, Brian Boston, Aisling Broderick, Kevin Brown, Ana Crespo-Blanc, Emilie Even, Shigeshi Fuchida, Rina Fukuchi, Sebastian Hammerschmidt, Pierre Henry, Matthew Josh, María José Jurado, Hiroko Kitajima, Manami Kitamura, Ana Maia, Makoto Otsubo, James Sample, Anja Schleicher, Hiroki Sone, Chen Song, Robert Valdez, Yuzuru Yamamoto and Kiho Yang; Integrated Ocean Drilling Program, Expedition 348 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program, Vol.348, 16p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. 35 refs.; illus., incl. sects., 3 tables, sketch map
Summary: This report summarizes the results of X-ray diffraction analyses of cuttings samples (1-4 mm diameter ) from Integrated Ocean Drilling Program Hole C0002N, which is located offshore southwest Japan. The analyses included 73 specimens (<2 µm size fraction) from the upper to middle levels of the Nankai accretionary prism. The cuttings were collected over a depth interval of 1175 to 2305 meters below seafloor (mbsf). Smectite is generally the most abundant clay mineral. Within lithologic Unit IV, percentages of smectite in the bulk sediment average 25.5 wt% (standard deviation = 5.7), whereas values for illite and undifferentiated kaolinite + chlorite average 19.5 and 11.9 wt%, respectively (standard deviations = 2.3 and 1.9). Within lithologic Unit V, percentages of smectite in the bulk sediment decrease to an average of 21.4 wt% (standard deviation = 2.1); mean values of illite and kaolinite + chlorite are 21.6 and 14.9 wt%, respectively (standard deviations = 2.1 and 2.5). The expandability of illite/smectite averages 64%, and values decrease downsection. The average proportion of illite in illite/smectite mixed-layer clays is 35%, and values increase downsection. The illite crystallinity index shifts at approximately 1495 mbsf; values above are consistent with detrital sources that were exposed to advanced diagenesis and anchizone metamorphic conditions; values below are smaller (higher apparent crystallinity) due to an analytical artifact.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 06 Petrology, Sedimentary; Chlorite; Chlorite group; Clay minerals; Cores; Crystallinity; Cuttings; Diagenesis; Expedition 348; IODP Site C0002; Illite; Integrated Ocean Drilling Program; Kaolinite; Kumano Basin; Marine sediments; Mineral assemblages; NanTroSEIZE; Nankai Trough; North Pacific; Northwest Pacific; Pacific Ocean; Sediments; Sheet silicates; Silicates; Smectite; West Pacific; X-ray diffraction data
Coordinates: N331800 N331801 E1363801 E1363800
Record ID: 2017043448
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute.