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

By
Xixi Zhao
Xixi Zhao
Earth and Planetary Sciences Department, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USAInstitute of Geophysics, University of Sao Paulo, Rua do Matao, 1226. CEP 05508-900, Sao Paulo, Brazil
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Hirokuni Oda
Hirokuni Oda
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
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Huaichun Wu
Huaichun Wu
School of Marine Science, China University of Geosciences, Xueyuan Road 29, Haidian District, Beijing 100083, People’s Republic of China
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Tomohiro Yamamoto
Tomohiro Yamamoto
Department of Environmental Systems Science, Doshisha University, 1-3 Tatara Miyakodani, Kyotanabe City 610-0394, Japan
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Yuhji Yamamoto
Yuhji Yamamoto
Center for Advanced Marine Core Research, Kochi University, B200 Monobe, Nankoku, Kochi 783-8502, Japan
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Yuzuru Yamamoto
Yuzuru Yamamoto
Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
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Takeshi Nakajima
Takeshi Nakajima
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Central 7, 1-1-1 Higashi, Tsukuba 305-8567, Japan
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Yujin Kitamura
Yujin Kitamura
Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
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Toshiya Kanamatsu
Toshiya Kanamatsu
Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
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Published:
January 01, 2013

Abstract

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.

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Contents

Geological Society, London, Special Publications

Magnetic Methods and the Timing of Geological Processes

L. Jovane
L. Jovane
Universidade de Saão Paulo, Brazil
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E. Herrero-Bervera
E. Herrero-Bervera
University of Hawaii at Manoa, USA
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L.A. Hinnov
L.A. Hinnov
Johns Hopkins University, USA
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B. Housen
B. Housen
Western Washington University, USA
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Geological Society of London
Volume
373
ISBN electronic:
9781862396364
Publication date:
January 01, 2013

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