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  • 1
    Electronic Resource
    Electronic Resource
    Rock magnetism and paleomagnetic stratigraphy of forearc sediments of the Japan Trench, ODP Sites 1150 and 1151 (2004)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 13 (2004), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  Magnetic measurements were carried out to investigate rock magnetic properties and paleomagnetic directions of late and middle Miocene sediments recovered from the land side of the Japan Trench during the Ocean Drilling Program Leg 186. Because the low coercive component in natural remanent magnetization (NRM) normalized by anhysteretic remanent magnetization shows that the drilling-induced magnetization is severe in the sections obtained by the advanced hydraulic piston coring method, careful analyses of demagnetization of NRM using the ‘demagnetization plane’ were carried out to decompose the direction and intensity. Magnetostratigraphic correlation down to the upper Miocene, supplemented by biostratigraphic data, revealed that the sedimentation rates are characterized by drastic changes, with the early Pliocene having the highest rate. This high sedimentation rate is related to the subsidence of the southern deep-sea terrace of the Japan Trench.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2003.00420.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Middle Miocene to Pleistocene magneto-biostratigraphy of ODP Sites 1150 and 1151, northwest Pacific: Sedimentation rate and updated regional geological timescale (2004)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 13 (2004), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Abstract  Shipboard and shore-based investigation on siliceous and calcareous microfossil biostratigraphy, magneto-stratigraphy and tephrostratigraphy identified numerous datum events from the sedimentary sequences of Sites 1150 and 1151 drilled on the forearc basin of northern Japan by the Ocean Drilling Program Leg 186. Some 83 datum events were selected to construct new age–depth models for the sites. Based on the reliable magneto-stratigraphy from the Pleistocene to the Upper Miocene, which were correlated to the standard geomagnetic polarity timescale, and on excellent records of diatom and radiolarian biostratigraphy throughout the sequences, the shipboard age model was revised. Major revisions referred to stratigraphic position of the Miocene–Pliocene boundary that has been shifted more than 200 m downward in each sequence. The age–depth relations of the forearc sites represent drastic changes in the sedimentation rate—extremely high (40 cm/k.y. on average) in the Early Pliocene and low (less than 2 cm/k.y. on average) in the Middle Miocene—and several hiatuses exist throughout the sequence. The drastic changes can be related mostly to changes in diatom sedimentation and the tectonics of the Japanese Island Arc. Local ages for some foraminiferal, calcareous nannofossil and radiolarian bioevents are estimated from the age–depth models at each site. These newly calibrated bioevents and biozones as well as established diatom biostratigraphy are incorporated into the updated magneto-biochronologic timescale, which will contribute to an improvement in biochronologic accuracy of Neogene sediments in northern Japan and adjacent areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2003.00426.x
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    Paper (German National Licenses)
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  • 3
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    (Table 1) Anisotropy of magnetic susceptibility and paleomagnetic results for ODP Sites 186-1150 and 186-1151 (2003)
    PANGAEA
    In:  Supplement to: Kanamatsu, Toshiya; Matsuo, Kazue (2003): Rock magnetic study of sediments from the Japan Trench, ODP Leg 186: implications for deformation of sediments. In: Suyehiro, K; Sacks, IS; Acton, GD; Oda, M (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 186, 1-21, https://doi.org/10.2973/odp.proc.sr.186.113.2003
    Details
    Publication Date: 2024-01-09
    Description: The fabric of fine-grained sediments from the deep-sea terrace on the landward side of the Japan Trench, cored during Ocean Drilling Program Leg 186, was analyzed using the anisotropy of magnetic susceptibility. The purpose of this study was to document the magnetic fabrics formed in a tensional environment. Faults and joints (healed fractures) were found in the lower portion of recovered core. Analysis of these structures suggests an east-west tensional direction. The general shape of the magnetic fabric ellipsoid is fairly oblate. Bedding planes dip to the east in Hole 1151, and the magnetic fabric is completely controlled by the bedding plane. The magnetic fabric in the interval highly affected by fracturing, however, shows higher anisotropy. Magnetic foliations, which have been reorientated using paleomagnetic north, incline eastward and westward.
    Keywords: 186-1150; 186-1151; Anisotropy-magnetic susceptibility, factor F, foliation; Anisotropy-magnetic susceptibility, factor L, lineation; COMPCORE; Composite Core; Declination of principle axis K1; Declination of principle axis K2; Declination of principle axis K3; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Event label; Inclination of principle axis K1; Inclination of principle axis K2; Inclination of principle axis K3; Joides Resolution; Kappabridge, AGICO KLY-3S; Leg186; Magnetic susceptibility, volume; Magnitude of anisotropy; North Pacific Ocean; NRM, Declination after demagnetization; NRM, Inclination after demagnetization; Ocean Drilling Program; ODP; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 10387 data points
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    DATA PANGAEA
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