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- Title
Formation and deformation processes of late Paleogene sedimentary basins in southern central Hokkaido, Japan: Paleomagnetic and numerical modeling approach.
- Authors
Tamaki, Machiko; Kusumoto, Shigekazu; Itoh, Yasuto
- Abstract
Formation and deformation processes of the late Paleogene sedimentary basins related to a strike–slip fault system in southern central Hokkaido are described by a combination of paleomagnetic study and numerical analysis. After correction of the Miocene counter-clockwise rotation associated with back-arc opening of the Japan Sea, paleomagnetic declination data obtained from surface outcrops in the Umaoi and Yubari areas show significant easterly deflections. Although complicated differential rotation is anticipated as a result of recent thrust movements, clockwise rotation in the study areas is closely linked with development of the Paleogene Minami-naganuma Basin as a pull-apart depression along the north–south fault system. Numerical modeling suggests that 30 km of strike–slip is required to restore the distribution and volume of the Minami-naganuma Basin. The relative slip rate on the long-standing fault system is about 10 mm/yr, which corresponds to global-scale plate motion. It has inevitably caused regional rearrangement of the eastern Eurasian margin. A rotation field simulated by simplified dextral motion using dislocation modeling basically accords with the paleomagnetic data around the pull-apart basin.
- Subjects
HOKKAIDO (Japan); JAPAN; PALEOMAGNETISM; PALEOGENE stratigraphic geology; NUMERICAL analysis
- Publication
Island Arc, 2010, Vol 19, Issue 2, p243
- ISSN
1038-4871
- Publication type
Article
- DOI
10.1111/j.1440-1738.2009.00698.x