Data report; Clay mineral assemblages in slope basin sediments and mass-transport deposits at Sites C0018 and C0021, IODP Expeditions 333 and 338

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doi: 10.2204/iodp.proc.338.207.2017
Author(s): Underwood, Michael B.
Integrated Ocean Drilling Program, Expedition 338 Scientists, College Station, TX
Author Affiliation(s): Primary:
New Mexico Institute of Mining and Technology, Department of Earth and Environmental Science, Socorro, NM, United States
Volume Title: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 3, NanTroSEIZE plate boundary deep riser 2; Expedition 338 of the riser drilling platform from and to Shimizu, Japan; Sites C0002, C0012, C0018, and C0021-C0022; 1 October 2012-13 January 2013
Volume Author(s): Strasser, Michael; Dugan, Brandon; Kanagawa, Kyuichi; Moore, Gregory; Toczko, Sean; Maeda, Lena; Kido, Yukari; Thu, Moe Kyaw; Sanada, Yoshinori; Esteban, Lionel; Fabbri, Olivier; Geersen, Jacob; Hammerschmidt, Sebastian; Hayashi, Hiroki; Heirman, Katrien; Hüpers, Andre; Jurago Rodriguez, Maria José; Kameo, Koji; Kanamatsu, Toshiya; Kitajima, Hiroko; Masuda, Harue; Milliken, Kitty; Mishra, Ravi; Motoyama, Isao; Olcott, Katelyn; Oohashi, Kiyokazu; Pickering, Kevin T.; Ramirez, Sebastian G.; Rashid, Harunur; Sawyer, Derek; Schleicher, Anja; Shan Yehua; Skarbek, Robert; Song, Insun; Takeshita, Toru; Toki, Tomohiro; Tudge, Joanne; Webb, Susanna; Wilson, Dean J.; Wu, Hung-Yu; Yamaguchi, Asuka
Source: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 3, NanTroSEIZE plate boundary deep riser 2; Expedition 338 of the riser drilling platform from and to Shimizu, Japan; Sites C0002, C0012, C0018, and C0021-C0022; 1 October 2012-13 January 2013, Michael Strasser, Brandon Dugan, Kyuichi Kanagawa, Gregory Moore, Sean Toczko, Lena Maeda, Yukari Kido, Moe Kyaw Thu, Yoshinori Sanada, Lionel Esteban, Olivier Fabbri, Jacob Geersen, Sebastian Hammerschmidt, Hiroki Hayashi, Katrien Heirman, Andre Hüpers, Maria José Jurago Rodriguez, Koji Kameo, Toshiya Kanamatsu, Hiroko Kitajima, Harue Masuda, Kitty Milliken, Ravi Mishra, Isao Motoyama, Katelyn Olcott, Kiyokazu Oohashi, Kevin T. Pickering, Sebastian G. Ramirez, Harunur Rashid, Derek Sawyer, Anja Schleicher, Shan Yehua, Robert Skarbek, Insun Song, Toru Takeshita, Tomohiro Toki, Joanne Tudge, Susanna Webb, Dean J. Wilson, Hung-Yu Wu and Asuka Yamaguchi; Integrated Ocean Drilling Program, Expedition 338 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program, Vol.338, 14p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. 20 refs.; illus., incl. sect., 3 tables, sketch map
Summary: This report summarizes the results of X-ray diffraction analyses of core samples from Sites C0018 and C0021 in the Nankai subduction zone (offshore southwest Japan). The Integrated Ocean Drilling Program recovered the cores during Expeditions 333 and 338, and a total of 122 specimens were analyzed (<2 mm size fraction). Depositional facies include trench slope deposits (hemipelagic mud with thin interbeds of turbidites and volcanic ash), mass-transport deposits (MTD), and sand-rich slope basin deposits. Illite is generally the most abundant clay mineral within both intact and MTD intervals. At Site C0018, the average amount of illite in the clay-size fraction of Subunit Ia (slope basin with MTD) is 37.7 wt% (standard deviation = 4.2). Proportions of smectite and chlorite average 26.8 and 20.2 wt%, respectively. Average contents of kaolinite and quartz are 4.1 and 11.3 wt%, respectively. Within Subunit Ib (sandy slope basin), the average contents are 37.2 wt% illite, 23.6 wt% smectite, 30.7 wt% undifferentiated chlorite + kaolinite, and 8.5 wt% quartz. Results are similar at Site C0021, where illite averages 43.7 wt% (standard deviation = 4.5). Average values for the other minerals are 23.6 wt% smectite, 24.3 wt% undifferentiated chlorite + kaolinite, and 8.4 wt% quartz. Most values of illite/smectite expandability fall between 55% and 65%. Values of the illite crystallinity index are indicative of detrital sources that were exposed to anchizone and epizone metamorphic conditions.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 06 Petrology, Sedimentary; Asia; Chlorite; Chlorite group; Clay minerals; Continental margin; Cores; Expedition 333; Expedition 338; Far East; Honshu; IODP Site C0018; IODP Site C0021; Illite; Integrated Ocean Drilling Program; Japan; Kaolinite; Kii Peninsula; 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: N330925 N330925 E1364053 E1364053
N331003 N331003 E1363952 E1363929
Record ID: 2017020805
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.