Volcanic vent and feeder dikes from the Latest Miocene Tsuzurao Volcanic Rocks, Oki-Dogo

Sawada, Yoshihiro; Toume, Akane; Kobayashi, Sinji; Komuro, Hiroaki; Kitagawa, Hiroya; Murakami, Hisasi

doi:10.5575/geosoc.105.vii

Cited by 3 publications

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“…Given that mafic minerals dominate liquidus phases in basaltic magmas (e.g., olivine, spinel, and clinopyroxene; Stolper, 1980), MgO content or Mg # of basaltic rock (SiO 2 < 56 wt%) is considered to represent the extent of magmatic differentiation. The Mg # of the studied samples varies from 78 to 40 (where Fe 3+ /Fe total (molar) = 0.15) and shows positive correlations with S15-S35; Feineman et al, 2013;Furuyama, 1976;Genbudo Research Group, 1991;Iwamori, 1989Iwamori, , 1991Iwamori, , 1992Kawamoto, 1990;Kimura, Gill, et al, 2014;Kurasawa & Takahashi, 1960;Moriyama, 2006;Morris et al, , 1999Nagao & Fujibayashi, 1989;Nagao & Sakaguchi, 1990;Nagasaki & Nagao, 1988;Pineda-Velasco et al, 2018;Sakiyama et al, 1995;Sawada et al, 2009;Sawada, Al-Jairani, et al, 2008;Sawada, Tome, et al, 2008;Shukuno & Arai, 1999;Takurayama Research Group, 1984;Tamura et al, 2000;Tatsumi et al, 1999;Uto, 1990;Yamauchi et al, 2009;Zellmer et al, 2015).…”

Section: Shallow-level Processesmentioning

confidence: 95%

“…(c) Longitudinal variation in K‐Ar ages (<12 Ma) for the volcanic rocks in the Chugoku district. Color symbols, the ages from this study and Pineda‐Velasco et al (2018); gray circles, literature (Table S12; Fujimaki et al, 1989; Furuyama et al, 2002; Furuyama, Nagao, Kasatani, et al, 1993; Furuyama, Nagao, Mitsui, et al, 1993; Kagami et al, 1996; Kakubuchi et al, 2000; Kaneko & Tiba, 1998; Kaneoka et al, 1977; Kano et al, 1994, 2014; Kano & Nakano, 1985; Kawai & Hirooka, 1967; Kimura et al, 2003; Kitani & Iwamoto, 2004; Matsuura, 1986; Morris et al, 1990, 1997, 1999; Sawada et al, 2006; Sawada, Al‐Jairani, et al, 2008; Sawada, Tome, et al, 2008; Tiba et al, 2002; Toshida et al, 2002; Tsukui et al, 1985; Uto, 1990, 1995; Uto et al, 1994; Wada et al, 1990). Volcanic activity in the last 12 Myr is subdivided into three episodes: Episode 1 from 12 to 8 Ma; Episode 2 from 8 to 4 Ma, and Episode 3 from 4 Ma to the present.…”

Section: Introductionmentioning

confidence: 99%

“…Plot of Mg # (≡100 × Mg/(Mg + Fe 2+ ) in molar) versus CaO/Al 2 O 3 ratio (weight) and Cr-Ni abundances of mafic volcanic rocks in the Chugoku district. In Figure 5a, the literature data are shown as smaller symbols (TablesS15-S35;Feineman et al, 2013;Furuyama, 1976; Genbudo Research Group, 1991;Iwamori, 1989Iwamori, , 1991Iwamori, , 1992Kawamoto, 1990;Kimura, Gill, et al, 2014;Kurasawa & Takahashi, 1960;Moriyama, 2006;Morris et al, , 1999Nagao & Fujibayashi, 1989;Nagao & Sakaguchi, 1990;Nagasaki & Nagao, 1988;Pineda-Velasco et al, 2018;Sakiyama et al, 1995;Sawada et al, 2009;Sawada, Al-Jairani, et al, 2008;Sawada, Tome, et al, 2008;Shukuno & Arai, 1999; Takurayama Research Group, 1984;Tamura et al, 2000;Tatsumi et al, 1999;Uto, 1990;Yamauchi et al, 2009;Zellmer et al, 2015).Arrows with "pl", "ol", and "cpx" depict fractional crystallization of plagioclase, olivine, and clinopyroxene, respectively. Gray band indicates the range of Mg # of melt equilibrated with mantle olivine (Mg…”

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confidence: 99%

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Feedback of Slab Distortion on Volcanic Arc Evolution: Geochemical Perspective From Late Cenozoic Volcanism in SW Japan

et al. 2020

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Southwest Japan is an island arc formed by subduction of the Philippine Sea (PHS) plate. The Quaternary magmatism in this region is characterized by eruptions of high-Sr andesites and dacites, considered to have been derived by melting of the PHS plate. The loci of these volcanoes spatially coincide with seismic discontinuities of the subducted PHS plate. Thus, the magmatism is interpreted as the result of slab melting at the plate tears. However, the processes that promote slab tearing remain unclear. In this study, we applied geochronological and geochemical analyses to late Cenozoic volcanic rocks in southwest Japan as tracers of slab morphology. Two different magma types, ocean-island basalt (OIB) and island-arc basalt (IAB), have occurred over 12 million years (Myr). These two magmas are attributed to different integrations of melts extracted from an originally fertile mantle; the OIBs from high temperature melt (1,300-1,400°C) were extracted at a depth of 40-80 km, whereas the IABs were extracted from a shallower, lower temperature region (30-60 km, 1,200-1,350°C). Secular change in Sr enrichment of IAB likely arose due to a transition of slab-derived fluids, incorporated into magmas as they formed, from water-to melt-dominant one. Progressive shallowing of the subducted PHS plate is responsible for secular change in the properties of slab-derived fluids as well as rollback of OIB volcanoes. Production of chemically variable magmas in the Chugoku district is the surface expression of distorting slab morphology by interaction between mantle and the subducting plate.

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Section: Shallow-level Processesmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Feedback of Slab Distortion on Volcanic Arc Evolution: Geochemical Perspective From Late Cenozoic Volcanism in SW Japan

et al. 2020

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“…Geological age of the Kumi Formation is thought to be the early Late Miocene-the middle Late Miocene based on the foraminiferal assemblage (Okubo and Takayasu, 1980), the diatom assemblage (Yokota, 1984;Yamasaki et al, 1990;Yamasaki, 1992) and on F.T. ages Kojima et al (1995), Sawada et al (1999), andYamasaki (1992).…”

Section: Stratigraphymentioning

confidence: 99%

“…The Kori Basalt, Nagu Volcanic and Togo Basalt Members are contemporaneous heterogeneous facies with the Koji Tuff and the Ohzuku Conglomerate Members (Yamasaki, 1992). The Iwata et al (1988), Kaneoka et al (1977), Kojima et al (1995), Okubo and Takayasu (1980), Sawada et al (1999), Yamasaki (1992), Gansawa (1989), andYokota (1984).…”

Section: Stratigraphymentioning

confidence: 99%

Paleomagnetism and fission-track ages of Oki-Dogo Island in Southwest Japan

et al. 2014

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Zircon fission-track (F.T.) ages and paleomagnetic directions were measured on the Neogene series of the OkiDogo Island. The results of F.T. dating on the the Tokibariyama Formation show ages of 23.7 ± 1.3 and 20.0 ± 2.3 Ma, indicating the early Early Miocene. Paleomagnetic measurements of the Tokibariyama, Kori Formations (24-17 Ma) and the Oki Trachyte-Rhyolite (6.8 Ma) were done to reveal the movement of Oki-Dogo Island during the Japan Sea opening. The Tokibariyama and Kori Formations show an average declination of 39.9• . The Oki Trachyte-Rhyolite has the same average geomagnetic direction as the present day value. These results show that a clockwise rotation of 40• ± 15• of the Oki-Dogo Island occurred between 17 and 6.8 Ma which is similar to the main land of southwest Japan.

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Fluorite alignments cutting metasomatic textures in trachyte feldspars from Oki-Dogo Island, Sea of Japan

NAKANO

2024

Journal of Mineralogical and Petrological Sciences

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Feldspar internal textures in a pyroclastic trachyte from Oki-Dogo, Sea of Japan, were examined to expand the understanding of feldspar reactions during the cooling through magmatic to hydrothermal stages, beyond the previous information of feldspars in Oki-Dogo alkaline lava and sheet rocks, using the methods of an electron microprobe and cathodoluminescence. Two types of micron-size internal microtextures were found to coexist in individual feldspar phenocrysts: clear domain textures, formed during a high-temperature magmatic stage, and turbid microperthitic textures, formed during a low-temperature subsolidus stage. The both microtextures are products of metasomatic replacement reactions. In addition, nano-size fluorite grains are aligned across the microtextures. The fluorite occurrence records the behavior of fluorine related to feldspar reactions.

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Volcanic vent and feeder dikes from the Latest Miocene Tsuzurao Volcanic Rocks, Oki-Dogo

Cited by 3 publications

References 0 publications

Feedback of Slab Distortion on Volcanic Arc Evolution: Geochemical Perspective From Late Cenozoic Volcanism in SW Japan

Feedback of Slab Distortion on Volcanic Arc Evolution: Geochemical Perspective From Late Cenozoic Volcanism in SW Japan

Paleomagnetism and fission-track ages of Oki-Dogo Island in Southwest Japan

Fluorite alignments cutting metasomatic textures in trachyte feldspars from Oki-Dogo Island, Sea of Japan

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