Clay-mineral assemblages across the Nankai-Shikoku subduction system, offshore Japan; a synthesis of results from the NanTroSEIZE project

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doi: 10.1130/GES01626.1
Author(s): Underwood, Michael B.; Guo, Junhua
Author Affiliation(s): Primary:
New Mexico Institute of Mining and Technology, Department of Earth and Environmental Science, Socorro, NM, United States
California State University at Bakersfield, United States
Volume Title: Geosphere (Boulder, CO)
Source: Geosphere (Boulder, CO), 14(5), p.2009-2043. Publisher: Geological Society of America, Boulder, CO, United States. ISSN: 1553-040X
Note: In English. 360 refs.; illus., incl. geol. sketch maps, charts, strat. cols., sect.
Summary: The Integrated Ocean Drilling Program, as part of the Nankai Trough Seismogenic Zone Experiment, recovered samples of mud and mudstone from the Kumano forearc basin, the inner and outer accretionary prisms, the overlying slope apron, and the Shikoku Basin (subduction inputs). This unprecedented suite of cores and cuttings captures an unusually complicated history of subduction-zone tectonics, erosion and dispersal of suspended sediment from multiple sources, and sedimentation in diverse environments. Our X-ray diffraction analyses of 1567 samples show that clay-mineral assemblages shifted gradually throughout the subduction system, from a smectite-rich assemblage during the Miocene to a more illite- and chlorite-rich assemblage during the Pliocene and Quaternary. Miocene muds in the Shikoku Basin (Sites C0011 and C0012) originated primarily from weathering of anomalous, near-trench felsic-volcanic rocks along a broad swath of the Outer Zone of Japan. The middle Miocene, however, was also a time of sediment transport into the Shikoku Basin by turbidity currents emanating from the East China Sea (Kyushu Fan). Interfingering of clays from those two sources resulted in considerable compositional scatter. Our results also reveal large discrepancies in contents of smectite between Miocene mudstones from the inner accretionary prism (Sites C0001 and C0002) and coeval mudstones from the Shikoku Basin. We suggest that frontal accretion during the early-late Miocene was a product of Pacific plate subduction rather than subduction of the Philippine Sea plate. Routing of sand through the East China Sea was effectively cut off by ca. 7 Ma due to rifting of the Okinawa Trough and the buildup of topography along the Ryukyu arc-trench system. Subduction of Shikoku Basin restarted at ca. 6 Ma, and denudation of the Outer Zone continued through the Pliocene and Quaternary. Those adjustments in weathering, from volcanoes to exposures of plutons and metasedimentary rocks, gradually increased the concentrations of illite and chlorite. By the late Pliocene, multiple sources, including the rapidly uplifted Izu-Honshu collision zone, supplied suspended sediment through a combination of transverse and trench-parallel (axial) routing. At the same time, the northeast-directed Kuroshio Current intensified at ca. 3.5 Ma. That regional-scale oceanographic transition probably resulted in more illitic clays moving from offshore Taiwan through the Okinawa Trough, although its compositional signal is masked by simultaneous enrichment of illite from the Outer Zone sources. Accreted trench-wedge deposits in the frontal prism (Sites C0006 and C0007) originated mostly from the Izu-Honshu collision zone, and most were transported down the axis of the trench by sediment gravity flow. Hemipelagic deposits in the Kumano Basin (Site C0002) were homogenized from a combination of transverse gravity flows, northeast-directed surface current, and thermohaline bottom currents. Slope-apron and slope-basin deposits (including mass-transport deposits) likewise show uniform clay-mineral assemblages indicative of northeast-directed transport by the Kuroshio Current, transverse resedimentation, and bottom-water circulation. Collectively, these differences in sediment composition in both time and space set the Nankai-Shikoku depositional system apart from other subduction zones, and they are important to consider when assessing the margin's hydrogeology and frictional and/or geotechnical properties.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; 18 Geophysics, Solid-Earth; Accretion; Asia; Basins; Cenozoic; Chlorite; Chlorite group; Clastic rocks; Clastic sediments; Clay minerals; Concentration; Erosion; Expedition 316; Far East; Fore-arc basins; Gravity flows; IODP Site C0001; IODP Site C0002; IODP Site C0006; IODP Site C0007; IODP Site C0011; IODP Site C0012; Illite; Integrated Ocean Drilling Program; Intrusions; Izu-Honshu collision zone; Japan; Kumano Basin; Kyusha Fan; Metamorphic rocks; Metasedimentary rocks; Mineral assemblages; Miocene; Mud; NanTroSEIZE; Nankai-Shikoku subduction system; Neogene; North Pacific; Northwest Pacific; Ocean floors; Okinawa; Pacific Ocean; Philippine Sea; Philippine Sea Plate; Plate tectonics; Plates; Pliocene; Plutons; Quaternary; Rifting; Ryukyu Islands; Ryukyu Trench; Sand; Sandstone; Sedimentary rocks; Sediments; Sheet silicates; Shikoku; Shikoku Basin; Silicates; Smectite; Subduction; Tertiary; Thermohaline circulation; Trenches; Turbidite; Turbidity; West Pacific; X-ray diffraction data
Coordinates: N310000 N340000 E1380000 E1330000
Record ID: 2019006697
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