2015
DOI: 10.1186/s40623-015-0266-3
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Abstract: Southwest Japan rotated clockwise during the late stage of the opening of the Japan Sea, although the exact timing of the rotation is controversial. A recent biostratigraphic study has revealed that the Miocene Oidawara Formation in eastern Southwest Japan was deposited just before 15 Ma; consequently, its paleomagnetic direction may help constrain the timing of rotation. For this purpose, we collected fine felsic tuffs and siltstones at 71 stratigraphic sites (horizons) in the Oidawara Formation. An analysis … Show more

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Cited by 56 publications
(31 citation statements)
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“…Nevertheless, a pull-apart origin continues to be attributed to the Japan Sea because strikeslip faults at the extreme ends of the back-arc, in the Tsushima Strait and around Hokkaido, were known to be active around the time of opening (Fabbri et al, 1996;Fournier et al, 1994;Kikawa, et al, 1994;Yoon et al, 2014;Yoon and Chough, 1995). The most significant difficulty with the pullapart model involves paleomagnetic evidence for contrary rotations for the NE and SW Japan blocks during back-arc opening, which has since been confirmed in many studies (Baba et al, 2007;Hayashida et al, 1991;Hoshi and Matsubara, 1998;Hoshi et al, 2015;Otofuji, 1996;Otofuji et al, 1994;Takahashi and Saito, 1997;Tosha and Hamano, 1998;Yamaji et al, 1999). Simultaneous …”
Section: Accepted Manuscriptmentioning
confidence: 83%
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“…Nevertheless, a pull-apart origin continues to be attributed to the Japan Sea because strikeslip faults at the extreme ends of the back-arc, in the Tsushima Strait and around Hokkaido, were known to be active around the time of opening (Fabbri et al, 1996;Fournier et al, 1994;Kikawa, et al, 1994;Yoon et al, 2014;Yoon and Chough, 1995). The most significant difficulty with the pullapart model involves paleomagnetic evidence for contrary rotations for the NE and SW Japan blocks during back-arc opening, which has since been confirmed in many studies (Baba et al, 2007;Hayashida et al, 1991;Hoshi and Matsubara, 1998;Hoshi et al, 2015;Otofuji, 1996;Otofuji et al, 1994;Takahashi and Saito, 1997;Tosha and Hamano, 1998;Yamaji et al, 1999). Simultaneous …”
Section: Accepted Manuscriptmentioning
confidence: 83%
“…A rapid spreading rate similar to the high end of this range is known from the Lau Basin, which is opening at 15.9 cm/yr behind the Tonga Trench (Bevis et al, 1995). However, if we assume a tighter time interval for extension, <2 My, as suggested by the rapid rift-basin subsidence to mid-bathyal depths described by Yamaji (1990) or the rapid rotation of NE and SW Japan indicated by paleomagnetic deflections (Hoshi et al, 2015), the extension rate obtained, 25 cm/yr, far exceeds any known spreading rates. It is clear that a discrepancy exists between evidence from paleomagnetic/basin subsidence studies and plausible extension rates for the Japan Sea back-arc which cannot yet be reconciled.…”
Section: Accepted Manuscriptmentioning
confidence: 88%
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“…Based on a paleomagnetic study on Miocene sediments from the Oidawara Formation, eastern southwest Japan, Hoshi et al (2015) revealed that clockwise rotation of southwest Japan occurred mainly between 17.5 and 15.8 Ma, at a rotation rate of ~23°/Myr. Furthermore, Jeong et al (2015) presented the tectonic evolution of the Korean Peninsula based on the paleomagnetism and U-Pb geochronology of the late Cretaceous Chisulryoung Volcanic Formation.…”
Section: Paleomagnetism: Tectonicsmentioning
confidence: 99%