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Taira, Asahiko; Niitsuma, Nobuaki (1986): Magnetic properties and sand composition at DSDP Site 87-582 and Hole 87-583D [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.801626, Supplement to: Taira, A; Niitsuma, N (1986): Turbidite sedimentation in the Nankai Trough as interpreted from magnetic fabric, grain size, and detrital modal analyses. In: Kagami, H; Karig, DE; Coulbourn, WT; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 87, 611-632, https://doi.org/10.2973/dsdp.proc.87.112.1986

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Abstract:
At Site 582, DSDP Leg 87, turbidites about 560 m thick were recovered from the floor of the Nankai Trough. A turbidite bed is typically composed of three subdivisions: a lower graded sand unit, an upper massive silt unit, and an uppermost Chondrites burrowed silt unit. The turbidites intercalate with bluish gray hemipelagic mud which apparently accumulated below the calcite compensation depth. In order to investigate the nature and provenance of the turbidites, we studied the grain orientation, based on magnetic fabric measurements and thin-section grain counting, and grain size, using a photo-extinction settling tube and detrital modal analysis.
The following results were obtained: (1) grain orientation analysis indicates that the turbidity current transport parallels the trench axis, predominantly from the northeast; (2) Nankai Trough turbidites generally decrease in grain size to the southwest; (3) turbidite sands include skeletal remains indicative of fresh-water and shallow-marine environments; and (4) turbidites contain abundant volcanic components, and their composition is analogous to the sediments of the Fuji River-Suruga Bay area. Considering other evidence, such as physiography and geometry of trench fill, we conclude that the turbidites of Site 582 as well as Site 583 were derived predominantly from the mouth of Fuji River and were transported through the Suruga Trough to the Nankai Trough, a distance of some 700 km. This turbidite transport system has tectonic implications: (1) the filling of the Nankai Trough is the direct consequence of the Izu collision in Pliocene- Pleistocene times; (2) the accretion of trench fill at the trench inner slope observed in the Nankai Trough is controlled by collision tectonics; and (3) each event of turbidite deposition may be related to a Tokai mega-earthquake.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 31.793100 * Median Longitude: 133.895200 * South-bound Latitude: 31.775000 * West-bound Longitude: 133.859000 * North-bound Latitude: 31.829300 * East-bound Longitude: 133.913300
Date/Time Start: 1982-06-28T00:00:00 * Date/Time End: 1982-07-08T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Taira, A; Niitsuma, N (1986): (Table 3) Sand composition at DSDP Site 87-582. https://doi.org/10.1594/PANGAEA.801625
  2. Taira, A; Niitsuma, N (1986): (Table 2) Susceptibility, declination and inclination of magnetic fabric at DSDP Hole 87-583D. https://doi.org/10.1594/PANGAEA.801624
  3. Taira, A; Niitsuma, N (1986): (Table 1) Susceptibility, declination and inclination at DSDP Hole 87-582B. https://doi.org/10.1594/PANGAEA.801622