Sea-floor magnetization in the eastern part of the Japan Basin and its tectonic implications

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書誌事項

公開日
1990-09
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/0040-1951(90)90022-z
公開者
Elsevier BV

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説明

Abstract The tectonic history of the Japan Basin is revealed by the distribution of magnetization and the topography of basement in the eastern part of the Japan Basin: 40°30–43°00′N, 136°30–139°00′W. The vector and total intensity of the geomagnetic field were measured on the R/V “Hakuho-maru” expedition in 1986 and the R/V “Tansei-maru” expedition in 1987 with a track spacing of about 4 nautical miles. Geomagnetic anomalies were obtained from these data and from other cruises using IGRF/DGRF. Furthermore, data on sediment thickness were compiled with all the available seismic profiles from the area. A depth to basement map was prepared using a regression equation of velocity in the sediments and one-way reflection time. Inversions were performed using both the gridded geomagnetic anomaly field and the depth to basement data to calculate a gridded distribution of magnetization. The key results of the distribution of magnetization are summarized in the following three categories: 1. (1) Magnetic lineations exist only in the northern part of the area studied where the basement is deepest and fairly flat. The lineations have two trends: N40°E in the north and N60°E in the south. 2. (2) No magnetic lineations were observed in the morphologically high relief area in the southernmost part of the area studied. (3) Some round-shaped distributions of magnetization exist. The three categories correspond to oceanic, continental and volcanic areas, respectively. They are probably characteristic features of rifting along the continental margin.

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  • Tectonophysics

    Tectonophysics 181 (1-4), 285-297, 1990-09

    Elsevier BV

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