Fission track ages of volcanic rocks from Cretaceous to Tertiary in the inner belt of northeast Japan. Okushiri Island, Oga Peninsula and Asahi Mountains.

好博, 雁沢

doi:10.5575/geosoc.93.387

Cited by 40 publications

(11 citation statements)

References 11 publications

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“…The youngest paleomagnetic data was brought from the Kamagui Formation that is correlated with Blow's (1969) foraminifer zone N. 8 (15.1-16.4 Ma). The Kitaoguni Formation yields the oldest paleomagnetic data in this study, which was radiometrically dated at about 21 to 23 Ma (Ueda et al, 1973;Ganzawa, 1987). The tectonostratigraphy of the Uetsu area indicates that transtensional deformation began after the deposition of the Kitaoguni Formation and ceased at about 15 Ma (Yamaji, 1990), concordant with our paleomagnetic data.…”

Section: Discussionsupporting

confidence: 87%

Paleomagnetic evidence for Miocene transtensional deformations at the eastern margin of the Japan Sea

2014

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The opening of the Japan Sea backarc basin accompanied dextral, transtensional deformations in the NE Japan arc. To understand the intra-arc deformation we have studied paleomagnetism in the Uetsu area, NE Japan. Among the samples collected at 70 sites for paleomagnetic measurement reliable directions were obtained at 38 ones. About half of the sites yielded clockwise and the others show opposite declinations. Our data indicate that the northern Uetsu area rotated counterclockwise as a single block, whereas the southern Uetsu area was broken into a number of blocks that was rotated clockwise by the dextral transtension along the Nihonkoku-Miomote Line. Not only the Uetsu area but the entire eastern margin of the Japan Sea experienced such transtensional deformations in the Early to early Middle Miocene. The crust under NE Japan was broken into blocks but they rotated coherently with dextral transtension.

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Section: Discussionsupporting

confidence: 87%

Paleomagnetic evidence for Miocene transtensional deformations at the eastern margin of the Japan Sea

2014

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“…40 Ar] D 0.5354 £ 10 ¡5 scc/g: Flisch, 1982), biotite mica-Fe ( 40 Ar ¤ D 9.823 £ 10 ¡5 scc/g: Govindaraju, 1979) and phlogopite mica-Mg ( 40 Ar ¤ D 19.57 £ 10 ¡5 scc/g: Govindaraju, 1979). The obtained K-Ar age for plagioclase is 21.3 § 1.1 Ma (Table 2), conformable with formerly reported Wssion-track ages of zircon for Hokakejima Dacite, 21-22 Ma (Suzuki, 1980;Ganzawa, 1987), and indicates that the shallow-marine Shiose-no-Misaki sandstone-mudstone bed is older than 20 Ma.…”

Section: A Basic Sheet In the Shoise-no-misaki Sandstone And Conglomesupporting

confidence: 86%

“…2). The successions bear few fossils, but range in radiometric age from 34 to 24 Ma (Ganzawa, 1982(Ganzawa, , 1987Ohguchi et al, 1989Ohguchi et al, , 1995Agency for Natural Resources andEnergy, 1988, 1989;Yoshikawa et al, 2002) and unconformably underlie Early Miocene volcanic rocks or Late Early to Middle Miocene marine sediments. Among these, the successions in the Noto and Oga Peninsulas are suspected to intercalate subordinate marine sediments Ohguchi et al, 2005).…”

Section: Oga and Noto Peninsulas Honshumentioning

confidence: 97%

Stratigraphic review of Eocene to Oligocene successions along the eastern Japan Sea: Implication for early opening of the Japan Sea

Kano

Uto

Ohguchi

2007

Journal of Asian Earth Sciences

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“…The Kitaoguni Formation is extensive rhyolitic ignimbrites which occupy the basal horizon of Miocene sequence, which is composed of rhyolitic lavas and tuffs in the study area. This formation is dated at 22.4 ± 0.6 Ma by fission-track method (Ganzawa, 1987). The K-Ar age at 22 Ma is also reported by Ueda et al (1973).…”

Section: Geology Of the Study Areasupporting

confidence: 82%

The block rotation in the Uetsu area, Northern Part of Niigata Prefecture, Japan

2014

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Paleomagnetic and geologic studies were made in the Uetsu area, NE Japan, to clarify the Miocene intra-arc deformation associated with the Japan Sea opening. We obtained paleomagnetic directions from the Early to Middle Miocene pyroclastic rocks and lavas in the area. The average paleomagnetic direction is D = 28.0• , I = 48.7• and α 95 = 9.6• . It suggests that the clockwise rotation occurred in this area, which is opposite to the counter-clockwise rotation of NE Japan. A fault was discovered which could be the boundary of this rotating domain. The dextral movement is recognized for this fault, concordant with the clockwise rotation in the area. These paleomagnetic and structural data suggest that the clockwise block rotations occurred in the Uetsu area, accompanied by the dextral deformation.

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Fission track ages of volcanic rocks from Cretaceous to Tertiary in the inner belt of northeast Japan. Okushiri Island, Oga Peninsula and Asahi Mountains.

Cited by 40 publications

References 11 publications

Paleomagnetic evidence for Miocene transtensional deformations at the eastern margin of the Japan Sea

Paleomagnetic evidence for Miocene transtensional deformations at the eastern margin of the Japan Sea

Stratigraphic review of Eocene to Oligocene successions along the eastern Japan Sea: Implication for early opening of the Japan Sea

The block rotation in the Uetsu area, Northern Part of Niigata Prefecture, Japan

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