Tectonics and volcanism in the Sado-Pohang Belt from 20 to 14 Ma and opening of the Yamato Basin of the Japan Sea

Shimazu, Mitsuo; Yoon, Sunghyun; Tateishi, Masaaki

doi:10.1016/0040-1951(90)90025-4

Cited by 31 publications

(17 citation statements)

References 11 publications

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“…Shimazu et al (1990b) ing of the Sea of Japan and East Sea. Several work ers including Fujibayashi et al (1988) and Nakamura et al (1990) have noticed that no in fluence of subduction signature appeared in Nd, Sr isotopic variation with distance from the Japa nese trench.…”

Section: Nd and Sr Isotopic Datamentioning

confidence: 99%

“…Most alkali volcanic activities in the backarc basin in terms of the petrogenesis, chemical and isotopical characteristics and tectonic framework are closely related to the opening of the Sea of Japan and East Sea Wasserburg, 1981, 1986;Fujibayashi et al, 1988;Nohda et al, 1988;Tamaki, 1988;Morris and Kagami, 1989;Nakamura et al, 1989;Tatsumi et al, 1989;Kaneoka, 1990;Kaneoka et al, 1990;Nakamura et al, 1990;Shimazu et al, 1990b;Otofuji et al, 1991;Tatsumoto and Nakamura, 1991;Cousens and Allan, 1992;Shimazu et al, 1993;Jolivet et al, 1991Jolivet et al, , 1994Uto et al, 1994;Kaneko et al, 1996;Morris et al, 1997). Although several tens of prehistorical submarine volcanoes found in the backarc basin of the Japanese island, surface vol canoes on the sea surface cropped out extremely limited numbers such as the Ulreungdo, Dogdo and Oki islands.…”

Section: Introductionmentioning

confidence: 99%

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Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

et al. 1999

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Section: Nd and Sr Isotopic Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

et al. 1999

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“…Since these granitic and metamorphic rocks are older than the extension of the Japan Sea, it is probable that they were formed before the extension. We propose that molten rock intruded into the southeastern region of the hanging wall during the extension stage (Shimazu et al, 1990). Since geological fault F b coincides with the shallow velocity boundary dipping northwestward (Y = +3 km; Fig.…”

Section: Discussionmentioning

confidence: 80%

“…The Noto Peninsula is situated close to the Yamato Basin in the Japan Sea, which is a large rift basin formed during the extension stage of the Japan Sea (e.g., Otofuji et al, 1985;Shimazu et al, 1990). Based on geological studies of early Miocene syn-rifting succession in the northern regions of the Noto Peninsula (e.g., Kano et al, 2002), it has been Copyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional velocity structure in the source region of the Noto Hanto Earthquake in 2007 imaged by a dense seismic observation

et al. 2008

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The velocity structure and accurate aftershock distributions of the Noto Hanto Earthquake in 2007 (thrust type) are elucidated by inverting the arrival times from 917 aftershocks using double-difference tomography. P-wave velocity (V p ) of the hanging wall in the southeast appears to be higher than that of the footwall in the northwest, and the high-V p body of the hanging wall has a relatively high V p /V s ratio. Conversely, the low-V p body in the footwall appears to have a low V p /V s ratio at depths greater than 3 km. Aftershocks associated with the mainshock fault are roughly distributed along this velocity boundary between the hanging wall and footwall. Near-surface thin layers with significantly low V p and high V p /V s are imaged in a northwest direction from the mainshock epicenter. A likely explanation is that the mainshock fault plane was reactivated as a reverse fault in terms of the inversion tectonics due to the crustal shortening which initiated from the late Miocene. Both the mainshock hypocenter and the vertical alignment of aftershocks beneath it are located in the low-V p and low-V p /V s zones, indicating the potential presence of water-filled pores. Crustal stretching and shortening in and around the Noto Peninsula have created complex structures, including weak high-dip angle faults, almost vertical faults, and low velocity zones, which can potentially affect the seismic activities around the source region.

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“…Volcanism was active together with sedimentary basin formation in SE Korea from the Paleogene to the early Middle Miocene because of crustal extension associated with the back-arc opening of the East Sea (Sea of Japan) (Shimazu et al, 1990;Yoon, 1997;Lee et al, 1999). Tertiary sedimentary basins in SE Korea therefore contain abundant volcanic and volcaniclastic deposits in addition to epiclastic (non-volcaniclastic) sedimentary deposits (e.g., Bahk and Chough, 1996;Yoon, 1997;Son, 1998;Son et al, 2000;Son et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Tephra-filled volcanic neck (diatreme) of a mafic tuff ring at Maegok, Miocene Eoil Basin, SE Korea

Kwon

Sohn

2008

Geosci J

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The Eoil Basin is one of the Miocene sedimentary basins in SE Korea, containing abundant volcanic deposits in addition to sedimentary deposits. Origin of a mafic volcaniclastic deposit at Maegok in the southeastern basin margin has remained enigmatic although it was interpreted as peperite by some workers. New features of the deposit were revealed by recent re-exposure of the outcrop, including 1) the occurrence of the deposit as an isolated vertical cylinder, 2) an abundance of hydroclastically fragmented sideromelane shards within the matrix, 3) tilting, faulting, and ductile deformation of the surrounding sedimentary strata, indicating synvolcanic vent-ward collapse of the strata, 4) dike-like structures composed of fine-grained tephra, some of which intruded into the surrounding sedimentary deposits, and 5) some clasts arranged in a jigsaw fashion, indicating in situ fragmentation by shock waves. These features suggest that the deposit represents a tuff pipe or the diatreme (tephra-filled volcanic neck) of a phreatomagmatic volcano. Plastically deformed mafic clasts, formerly regarded as evidence for peperitic interaction between magma and wet sediment, show neither the features of simultaneous intrusion and mingling of magma with wet sediments nor the features of in situ fragmentation, which are essential characteristics of peperite. An abundance of sideromelane ash and the lack of juvenile lapilli in the deposit suggest that the diatreme belongs to a phreatomagmatic volcano that was produced by contact-surface steam explosivity, and that the volcano had probably the morphology of a tuff ring. The Maegok exposure is inferred to belong to the deeper part of the diatreme in spite of its occurrence at a shallow level, about 100 m below the pre-eruption surface. The conduit of the tuff ring is therefore interpreted to have had a shallow (a few hundred meters deep) and flared-up geometry.

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Tectonics and volcanism in the Sado-Pohang Belt from 20 to 14 Ma and opening of the Yamato Basin of the Japan Sea

Cited by 31 publications

References 11 publications

Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

Nd and Sr isotopes and K-Ar ages of the Ulreungdo alkali volcanic rocks in the East Sea, South Korea.

Three-dimensional velocity structure in the source region of the Noto Hanto Earthquake in 2007 imaged by a dense seismic observation

Tephra-filled volcanic neck (diatreme) of a mafic tuff ring at Maegok, Miocene Eoil Basin, SE Korea

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