Magnetostratigraphic results from sedimentary rocks of IODP's Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) Expedition 322

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doi: 10.1144/SP373.14
Author(s): Zhao, Xixi; Oda, Hirokuni; Wu Huaichun; Yamamoto, Tomohiro; Yamamoto, Yuhji; Yamamoto, Yuzuru; Nakajima, Takeshi; Kitamura, Yujin; Kanamatsu, Toshiya
Author Affiliation(s): Primary:
University of California at Santa Cruz, Earth and Planetary Sciences Department, Santa Cruz, CA, United States
Geological Survey of Japan, Japan
China University of Geosciences, China
Doshisha University, Japan
Kochi University, Japan
Japan Agency for Marine-Earth Science and Technology, Japan
Volume Title: Special Publication - Geological Society of London
Source: Special Publication - Geological Society of London, 373(1), p.191-243. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719 CODEN: GSLSBW
Note: In English. 43 refs.Online First; illus., incl. 7 tables, sketch map
Summary: We conducted a palaeomagnetic study on the Cenozoic sedimentary sequences of the Nankai Trough, recovered by the Integrated Ocean Drilling Program Expedition 322 in SE Japan. Sedimentary sections of Late Miocene age from the two subduction input sites (sites C0011 and C0012) recorded a pattern of magnetic polarity reversals that correlates well with the known magnetic polarity time scale. The polarity of characteristic remanent magnetization could be identified throughout the majority of the recovered cores of the two sites, following removal of a low-stability drilling-induced remanence. Most of the observed magnetostratigraphy from the characteristic directions is in good agreement with that to be expected from the stratigraphic position of the sequence deduced from the biostratigraphic data. Palaeomagnetic data from both shipboard and shore-based studies indicate changes in the rate of sedimentation from 9.5 to 2.7 cm/kyr at about 11 Ma, suggesting that some fundamental palaeoenvironmental change in the Shikoku Basin and/or significant tectonic event may have occurred in Late Miocene.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 18 Geophysics, Solid-Earth; Asia; Biostratigraphy; Cenozoic; Characteristic remanent magnetization; Expedition 322; Far East; Geochronology; IODP Site C0011; IODP Site C0012; Integrated Ocean Drilling Program; Japan; Lithostratigraphy; Magnetization; Magnetostratigraphy; Miocene; NanTroSEIZE; Nankai Trough; Neogene; North Pacific; Northwest Pacific; Pacific Ocean; Paleomagnetism; Relative age; Remanent magnetization; Reversals; Sedimentary rocks; Shikoku; Shikoku Basin; Southeastern Japan; Stratigraphic units; Tertiary; Upper Miocene; West Pacific
Coordinates: N324453 N324453 E1365501 E1365501
N324944 N324945 E1365256 E1365254
N324400 N325000 E1365600 E1365200
Record ID: 2013036679
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom