Some chemical and magnetic properties of rock samples from Matsukawa-ura drillhole, Soma city, Fukushima Prefecture, north-east Japan. Granitic rocks of Matsukawa-ura drillhole.

Kanaya, Hiroshi

doi:10.2465/ganko.91.364

Cited by 5 publications

(5 citation statements)

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“…Nakama et al (2010) concluded that ages for detrital zircons yield five distinct peaks of gra- Defant and Drummond (1990). Data for rocks from the Matsukawaura (Kanaya, 1996) and Tomioka boreholes, and Paleozoic granitic rocks in Japan (Kobayashi et al, 2000) are also shown for comparison. nitic activity in the Phanerozoic .…”

Section: Discussion Geochemical Features Of the Wariyama And Takasementioning

confidence: 99%

“…1; Fujita et al, 1988). The Wariyama Sheared Granodiorite is characterized by adakitic geochemistry, and is considered to be the southern extension of Early Cretaceous adakitic granites in Kitakami (Tsuchiya et al, 2007), as well as similar adakitic granites from borehole samples in Matsukawaura (Abe and Ishihara, 1985;Kanaya, 1996).…”

Section: Geology and Petrography General Geologymentioning

confidence: 99%

“…6 shows the relationship between Sr/Y ratios and Y concentrations for rocks from the Wariyama and Takase granites. Granitic rocks from the Tomioka and Matsukawaura boreholes (Kanaya, 1996), and Paleozoic granites in Japan (Kobayashi et al, 2000) are also plotted for comparison. Rocks from the Wariyama and Takase granites show typical adakitic characteristics with Sr/Y ratios greater than 40 (Moyen, 2009), and fall within the adakite field (Defant and Drummond, 1990).…”

Section: Zircon U-pb Agementioning

confidence: 99%

“…The Wariyama Sheared Granodiorite occurs along the east side of the Futaba Fault in the eastern margin of the Abukuma Mountains. Although basement rocks are rarely exposed to the east of the Futaba Fault, granitic rocks have been reported from the Matsukawaura borehole (Abe and Ishihara, 1985;Kanaya, 1996), 15 km southeast of Wariyama, and from the Tomioka borehole (Yanagisawa et al, 1989), 60 km south of Wariyama. The granitic rocks in the Matsukawaura borehole are adakitic granites that are Sr-rich, and resemble those of the Wariyama Sheared Granodiorite.…”

Section: Introductionmentioning

confidence: 99%

“…The fields for adakite and island arc andesite-dacite-rhyolite are fromDefant and Drummond (1990). Data for rocks from the Matsukawaura(Kanaya, 1996) and Tomioka boreholes, and Paleozoic granitic rocks in Japan(Kobayashi et al, 2000) are also shown for comparison.…”

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阿武隈山地東縁の石炭紀および白亜紀アダカイト質花崗岩類とその地質学的意義

Tsuchiya

Takeda

Tani

et al. 2014

Jour. Geol. Soc. Japan

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The Wariyama Sheared Granodiorite occurs along the east side of the Futaba Fault with the Wariyama uplift zone, Miyagi, Japan. Rocks from the WariyamaSheared Granodiorite can be geochemically classified as typical adakite, and further subdivided into medium-grained and K O-and Sr-poorer rocks, and coarse-grained and K O-and Sr-richer rocks. Zircons from the former yield U-Pb ages of and Ma, whereas zircons from the latter have ages of and Ma. On the basis of these results, the Wariyama Sheared Granodiorite can be redefined. The late Carboniferous granite is renamed the Wariyama Granite as in the past, but we use the term granite in a broad sense as describing the rock type. The Early Cretaceous granite is newly defined as the Takase Granite. The Takase Granite crops out on the eastern side of the central region of the Wariyama Granite with faulted contact. The Takase Granite is divided into the SiO -poor Takase Granite A and the SiO -rich Takase Granite B. The U-Pb zircon age of Ma obtained here corresponds to an interval of five major granitic events, and the timing of the onset of Permian granitic magmatism ( Ma) may actually be ca.Ma. Typical adakites are considered to be the product of slab melting, which occurred in response to unusual tectonic conditions, such as subduction of young lithosphere and/or an active ridge at ca. Ma.

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Section: Discussion Geochemical Features Of the Wariyama And Takasementioning

confidence: 99%

Section: Geology and Petrography General Geologymentioning

confidence: 99%

Section: Zircon U-pb Agementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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阿武隈山地東縁の石炭紀および白亜紀アダカイト質花崗岩類とその地質学的意義

Tsuchiya

Takeda

Tani

et al. 2014

Jour. Geol. Soc. Japan

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Petrology of the Taiheizan composite granitic rocks, Akita Prefecture, Northeast Japan

Fujimoto¹

2006

Japanese Magazine of Mineralogical and Petrological Sciences

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Cretaceous Taiheizan composite granitic pluton occurs in the Taiheizan mountains, central Akita prefecture, Northeast Japan. The rocks are divided into the East and West masses by the Kyowa Hitachinai mylonite zone, which resulted in right lateral movement. The East mass is composed of mainly weakly foliated medium to coarse grained hornblende biotite granodiorite and tonalite. They contain magnetite, but these magnetic susceptibilities average 8.08 10 3 SI units, which are relatively lower than those of typical magnetite series Kitakami granitic rocks. On the other hand, the West mass is composed of mainly foliated granodiorite and tonalite, which belong to the ilmenite series due to the absence of magnetite. Both rocks have different chemical features. The magnetite series East rocks have lower contents of Al 2 O 3 , Na 2 O and higher contents of MgO, K 2 O than the ilmenite series West rocks. Trace element contents show that the East rocks have higher contents in Cr, Ni, V, but lower in Zr. However, the chemistries of both rocks resemble those of Abukuma granitic rocks as compared with those of Kitakami rocks. The reported K Ar ages of the East and West masses also show the same ages from Abukuma rocks. Therefore, I conclude that the Taiheizan granitic rocks belong to the Abukuma belt, and the Kyowa Hitachinai mylonite may coincide with the boundary of low magnetic susceptibility magnetite series rocks and ilmenite series rocks in the Abukuma granitic rocks.

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