21
views
0
recommends
+1 Recommend
2 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Data report: clay mineral assemblages in the Shikoku Basin, NanTroSEIZE subduction inputs, IODP Sites C0011 and C0012: Expedition 322

      ,
      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 documents clay mineral assemblages outboard of the Nankai Trough at two sites in the Shikoku Basin. The sites make up part of the Kumano transect, offshore south-central Japan. Coring began during Integrated Ocean Drilling Program (IODP) Expedition 322, as part of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE). IODP Site C0011 is located on the northwest flank of Kashinosaki Knoll, and IODP Site C0012 is located on the summit of the seamount. A total of 292 samples of hemipelagic mud and mudstone were analyzed by X-ray diffraction, using oriented aggregates of the clay-size fraction (<2 µm). Smectite varies the most among the clay-size constituents, ranging in abundance from 35% to 100% (where smectite + illite + chlorite + kaolinite + quartz = 100%). Specimens with smectite contents of 80% or more are classified as bentonites, and we identified 44 such samples. The estimated amount of smectite in bulk mudstone ranges from 24% to 87% (where total clay minerals + quartz + feldspar + calcite = 100%), and a substantial number of bulk samples contain >45% smectite. On average, the expandability of illite/smectite mixed-layer clay is equal to 77%, and the average proportion of illite in illite/smectite is 11%. There is no systematic progression of clay mineral diagenesis over the depths sampled. Most values of illite crystallinity index are consistent with a detrital source that contains sedimentary rocks that were exposed to anchizone conditions of incipient metamorphism. The smectite-rich clay mineral assemblage is typical of early to middle Miocene deposits within the lower part of the Shikoku Basin.

          Related collections

          Most cited references38

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

          New insights into deformation and fluid flow processes in the Nankai Trough accretionary prism: Results of Ocean Drilling Program Leg 190

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

            Sediment deformation and hydrogeology of the Nankai Trough accretionary prism: Synthesis of shipboard results of ODP Leg 131

              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

                Author and article information

                Journal
                10.2204/iodp.proc.322.2010
                Proceedings of the IODP
                Integrated Ocean Drilling Program
                1930-1014
                15 May 2013
                Article
                10.2204/iodp.proc.322.202.2013
                13400d41-9453-4951-bd27-2f9cbd8c1daf

                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/

                History

                Earth & Environmental sciences,Oceanography & Hydrology,Geophysics,Chemistry,Geosciences

                Comments

                Comment on this article