Blog
About

  • Record: found
  • Abstract: found
  • Article: found
Is Open Access

Data report: clay mineral assemblages in the upper Shikoku Basin, results from IODP Expedition 333, Sites C0011 and C0012

,

Proceedings of the IODP

Integrated Ocean Drilling Program

Read this article at

ScienceOpenPublisher
Bookmark
      There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

      Abstract

      This report summarizes the results of X-ray diffraction analyses of core samples from Integrated Ocean Drilling Program (IODP) Sites C0011 and C0012, offshore southwest Japan. We analyzed 211 specimens (<2 µm size fraction) recovered during IODP Expedition 333. Most of those samples come from the uppermost hemipelagic/pyroclastic facies (Unit I) of the Shikoku Basin, with a limited number from the volcanic turbidite facies (Unit II) and the pelagic clay facies (Unit V). Minerals of the smectite group are generally the most abundant. At Site C0011, the amount of smectite in the clay-size fraction of Unit I averages 40.8 wt% (standard deviation = 11.5) and increases downsection. Proportions of illite and chlorite average 36.4 and 15.5 wt%, respectively. Average contents of kaolinite and quartz are 3.6 and 3.7 wt%, respectively. At Site C0012 (Unit I), the amount of smectite averages 50.0 wt% (standard deviation = 13.5) and increases downsection. Averages for the other minerals in the clay-size fraction are illite = 31.8 wt%, chlorite = 10.1 wt%, kaolinite = 5.5 wt%, and quartz = 2.6 wt%. Most values of illite/smectite expandability fall between 60% and 70%, and there are no systematic changes downsection. Values of the illite crystallinity index are generally consistent with detrital sources that were exposed to anchizone metamorphic conditions.

      Related collections

      Most cited references 24

      • Record: found
      • Abstract: not found
      • Article: not found

      Mineralogy and Sedimentation of Recent Deep-Sea Clay in the Atlantic Ocean and Adjacent Seas and Oceans

        Bookmark
        • Record: found
        • Abstract: not found
        • Article: not found

        Evaluation of factors controlling smectite transformation and fluid production in subduction zones: Application to the Nankai Trough

          Bookmark
          • Record: found
          • Abstract: found
          • Article: found
          Is Open Access

          NanTroSEIZE Stage 1 expeditions: introduction and synthesis of key results

          Integrated Ocean Drilling Program Expeditions 314, 315, and 316 were carried out as a unified program of drilling collectively known as Stage 1 of the Nankai Trough Seismogenic Zone Experiment, a multistage complex drilling project. A transect of eight sites was selected for riserless drilling to target the frontal thrust region, midslope megasplay fault region, and Kumano forearc basin region. Two of these sites are preparatory pilot holes for planned deep riser drilling operations, whereas the others targeted fault zone material in the shallow, presumed aseismic zone. Expedition 314 was dedicated to in situ measurement of physical properties and borehole imaging through logging while drilling in holes dedicated to that purpose. Expedition 315 was devoted to core sampling and downhole temperature measurements at one site in the megasplay region and one site in the forearc basin. Expedition 316 targeted the frontal and out-of-sequence megasplay fault region in the mid-slope environment. Results on accretionary complex structure, lithology and age, physical properties, and state of stress, which are documented in full in the site chapters of this volume, are here synthesized across the expeditions.
            Bookmark

            Author and article information

            Journal
            10.2204/iodp.proc.333.2012
            Proceedings of the IODP
            Integrated Ocean Drilling Program
            1930-1014
            16 August 2017
            10.2204/iodp.proc.333.205.2017

            This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

            Product
            Self URI (journal page): http://publications.iodp.org/

            Comments

            Comment on this article