"Green Tuff" Movement defined by fission track ages of igneous rocks Part2:Futomiyama area of Toyama Prefecture central Japan

好博, 雁沢

doi:10.5575/geosoc.89.271

Cited by 20 publications

(9 citation statements)

References 7 publications

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“…Tatsumi et al (1989) attributed inactive Oligocene volcanism around northeast Japan to asthenospheric injection into the mantle wedge on the Pacific plate. Subaerial volcanic rocks on the Japan Sea coast at the end of the Oligocene (Ganzawa, 1983;Itoh et al, 2001) show a chemical affinity with rift-margin volcanism (Ishida et al, 1998). Since a clear indication of a coeval marine transgression has not been reported for the Japan Sea coast, basin subsidence linked to thinning of Natal'in (1993);Otsuki (1992), respectively.…”

Section: Stage 1: Early Tertiary Configuration Of the Regional Volcanmentioning

confidence: 94%

Seismic evidence of divergent rifting and subsequent deformation in the southern Japan Sea, and a Cenozoic tectonic synthesis of the eastern Eurasian margin

Itoh

Uno

Arato

2006

Journal of Asian Earth Sciences

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Section: Stage 1: Early Tertiary Configuration Of the Regional Volcanmentioning

confidence: 94%

Seismic evidence of divergent rifting and subsequent deformation in the southern Japan Sea, and a Cenozoic tectonic synthesis of the eastern Eurasian margin

Itoh

Uno

Arato

2006

Journal of Asian Earth Sciences

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“…Early Early Miocene (24-21 Ma) felsic to intermediate volcanic rocks are sporadically distributed in NE Japan, and a number of paleomagnetic investigations have been carried out on these rocks (Otofuji et al, 1985(Otofuji et al, , 1994Nishitani and Tanoue, 1987;Tosha and Hamano, 1988;Fujiwara, 1992). The Fukuyama Formation in the Oshima Peninsula and the Daijima Formation in the Oga Peninsula, as well as the Nisatai Dacite in the Ninohe area, are well dated with radiometric methods (Nishimura and Ishida, 1972;Suzuki, 1980;Ganzawa, 1983Ganzawa, , 1987Kimura, 1986;Koshimizu et al, 1986;Tagami et al, 1995). Only one fission-track age of 24.7 ± 1.2 Ma for the Kunitomi Formation in the Oshima Peninsula, which is part of unpublished data of T. Matsuda, is introduced by Otofuji et al (1994).…”

Section: Paleomagnetic Rotations In Ne Japanmentioning

confidence: 98%

Early Miocene paleomagnetic results from the Ninohe area, NE Japan: Implications for arc rotation and intra-arc differential rotations

Hoshi

Matsubara

2014

Earth Planet Sp

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We have carried out a paleomagnetic study on well-dated Early Miocene volcanic rocks from the Ninohe area in northern NE Japan. Dacitic welded tuffs ranging from 24 to 21 Ma possess westerly paleomagnetic directions with normal polarity (formation-mean: D/I = 294.5°/44.2° with α 95 = 8.3°, 8 sites), while the andesite flows formed at 17 Ma exhibit southerly directions with reversed polarity (D/I = 186.6°/-61.9°, 2 sites). A positive conglomerate test assures the stability of high-temperature components of remanent magnetization. Our results demonstrate that northern NE Japan rotated counter-clockwise through more than 60° between 21 and 17 Ma, most likely in association with the opening of the Japan Sea. The rotation of northern NE Japan thus preceded the about 15 Ma rapid clockwise rotation of SW Japan, and was synchronous with the possible pre-16 Ma southward translation of it. In comparison with published data, we further suggest that intra-arc block rotations occurred in the back-arc region of NE Japan during and after the arc rotation.

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“…The Tetori Group is composed of Middle Jurassic to Lower Cretaceous fossiliferous (e.g., plants, mollusks, and dinosaurs) conglomerate, sandstone and mudstone (Sano, 2015). Late Cretaceous (~ 70 Ma) rhyolites with granitic plutons are distributed as the Futomiyama Group covering the Hida belt and Tetori Group (Sudo, 1979;Ganzawa, 1983;Kaneko et al, 2019). Cenozoic strata composed of sedimentary and volcanic rocks related to the Japan Sea opening unconformably cover those basement rocks.…”

Section: Geological Setting and Geochronology Of The Toyama Basinmentioning

confidence: 99%

“…The Late Oligocene to Middle Miocene strata related to the Japan Sea opening in the Toyama basin can be subdivided into Nirehara (Tori), Iwaine, Iozen, Kurosedani and Higashibessho Formations (Nakajima et al, 2019;Yamada and Takahashi, 2021). In the Nanto area (study area), Late Oligocene to Middle Miocene strata are distributed as the Tori, Iwaine and Iozen Formations (Ganzawa, 1983; Fig. 2).…”

Section: Geological Setting and Geochronology Of The Toyama Basinmentioning

confidence: 99%

Petrogenesis of Oligocene to Miocene volcanic rocks from the Toyama basin of the SW Japan arc: Temporal change of arc volcanism during the back-arc spreading in the Japan Sea

YAMADA,

TAKAHASHI,

OGITA

2023

Journal of Mineralogical and Petrological Sciences

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Oligocene to Miocene volcanic rocks from the Toyama basin of the SW Japan arc, that were formed during back-arc spreading in the Japan Sea, were examined to reveal their petrogenesis and temporal change of arc volcanism during the Japan Sea opening. The arc volcanism in the Toyama basin initiated with rhyolitic pyroclastic flows (Tori Formation) containing hecatolite (moonstone) in 23-22 Ma. Enriched Sr-Nd isotope (SrI = 0.70769-0.70944; NdI = 0.51203-0.51224) suggests that contemporaneous andesitic magma (Kamiwazumi and Matsunagi Formations) mixed or assimilated basement granitoids and gneisses of the Hida belt to generate rhyolitic magma. Subsequently, andesitic volcanism (Iwaine Formation) occurred in 18-17 Ma after magmatic hiatus. Andesitic lavas of the Iwaine Formation are composed of high magnesian andesite (HMA), high-Sr andesite and tholeiitic andesite. HMA has Mg#>64, high Cr and Ni concentrations, not so high Th/Yb and (La/Sm)N ratios, and slightly enriched Sr-Nd isotope (SrI = 0.70482; NdI = 0.51279). High-Sr andesite has relatively low SiO2 content (<60 wt.%), high Sr (>2000 ppm) and K2O contents (3.98 wt.% in the maximum), indicating that it is low-SiO2 adakite. These geochemical characteristics suggest that HMA and high-Sr andesite were produced by partial melting of the mantle wedge saturated by H2O derived from slab fluid and metasomatized by slab melt, respectively. Although chemical variation diagrams suggest tholeiitic andesite seems to have been generated from basaltic magma, it has enriched Sr-Nd isotope (SrI = 0.70713-0.70756; NdI = 0.51237-0.51241). Thus, tholeiitic andesite is considered to have been produced by AFC (assimilation and fractional crystallization) after generation of basaltic parental magma.Andesitic magmatism of the Iwaine Formation was followed by rhyolitic magmatism of the Iozen Formation in 17-16 Ma. The petrogenesis of the rhyolite from the Iozen Formation can be explained by low-rate mixing between andesitic magma (Iwaine Formation) and the Hida belt. The petrogeneses of the andesites, especially HMA and high-Sr andesite, are related to slab melting. Because the old and cold Pacific plate was subducting beneath the Toyama basin during the Japan Sea opening, additional heat source such as upwelling of the asthenospheric mantle into the mantle wedge is required. Moreover, back-arc spreading in the Japan Sea was driven by upwelling of the asthenospheric mantle into the mantle wedge.

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"Green Tuff" Movement defined by fission track ages of igneous rocks Part2:Futomiyama area of Toyama Prefecture central Japan

Cited by 20 publications

References 7 publications

Seismic evidence of divergent rifting and subsequent deformation in the southern Japan Sea, and a Cenozoic tectonic synthesis of the eastern Eurasian margin

Seismic evidence of divergent rifting and subsequent deformation in the southern Japan Sea, and a Cenozoic tectonic synthesis of the eastern Eurasian margin

Early Miocene paleomagnetic results from the Ninohe area, NE Japan: Implications for arc rotation and intra-arc differential rotations

Petrogenesis of Oligocene to Miocene volcanic rocks from the Toyama basin of the SW Japan arc: Temporal change of arc volcanism during the back-arc spreading in the Japan Sea

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