Volcanostratigraphy of the Lower Pleistocene in the northern flank of the Northern Yatsugatake volcanoes, central Japan.

康, 高橋; 邦章, 西来

doi:10.5575/geosoc.112.549

Cited by 7 publications

(1 citation statement)

References 34 publications

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“…Dykes (composed mainly of basalt) cut the KA basalt. This stratigraphic division is almost in agreement with that of Nakamura (1991) and Takahashi and Nishiki (2006). TA andesite lava flows are 50 -100 m thick with well -developed platy joints.…”

Section: Geology Of Tateshina Volcano and K-ar Ages Of Volcanic Rockssupporting

confidence: 77%

Effect of subduction components on production of basalts from Tateshina volcano, central Japan: geochemical calculation of dehydration of subducting oceanic crust and partial melting of overlying sediments, and subsequent fluid-mantle interaction

Katoh

Shuto

2009

Journal of Mineralogical and Petrological Sciences

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We report the major and trace element chemistry and Sr and Nd isotopic composition of basaltic rocks from the Quaternary Tateshina volcano, central Japan, and model the composition of these rocks in terms of the partial melting and melt -solid reactions controlled by the addition of slab -derived fluid and silicate melt to the original wedge mantle beneath the Tateshina area. Tateshina basaltic rocks have a SiO 2 content ranging from 50.06 to 53.28 wt% and a MgO content ranging from 5 to 7 wt%, indicating that these rocks are less fractionated. These rocks have a narrow range of Sr and Nd isotopic compositions ( Nd -Sm/Nd, indicating that Tateshina basaltic rocks have no crustal contamination. The wedge mantle peridotite would have experienced accumulated subduction events, including the addition of subduction components and the extraction of basalt magmas during the Tertiary period. In addition, we have accounted for the mantle motion accompanying slab subduction within the wedge mantle. Thus, we assumed that the mantle wedge before the effects of Quaternary subduction that produced the volcanic rocks of Tateshina volcano could have blended with residual mantle after the extraction of Tertiary basalt magmas with depleted MORB -source mantle (DMM). The model includes partial melting of the blended wedge mantle peridotite metasomatized by aqueous fluid and silicate melt derived from the dehydration of altered oceanic crust (AOC) and partial melting of oceanic sediments, respectively. The trace element and Sr isotope compositions of the basaltic rocks of Tateshina volcano can be reproduced by about 10% melting of the calculated wedge mantle peridotite modified by the addition of 0.8% -1.0% silicate melt from oceanic sediments and 0.2% -0.8% aqueous fluids from the AOC, respectively.

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Section: Geology Of Tateshina Volcano and K-ar Ages Of Volcanic Rockssupporting

confidence: 77%

Effect of subduction components on production of basalts from Tateshina volcano, central Japan: geochemical calculation of dehydration of subducting oceanic crust and partial melting of overlying sediments, and subsequent fluid-mantle interaction

Katoh

Shuto

2009

Journal of Mineralogical and Petrological Sciences

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Quaternary volcanism and tectonic history of the Suwa–Yatsugatake Volcanic Province, Central Japan

Nishiki¹,

Takahashi²,

Matsumoto³

et al. 2011

Journal of Volcanology and Geothermal Research

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K-Ar ages of volcanic rocks in the Tanzawa-Oiso area, central Japan: Implication for westward migration of the Pliocene volcanic front in the southern Fossa Magna region

慎一¹,

浩之²,

眞³

et al. 2012

Japanese Magazine of Mineralogical and Petrological Sciences

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丹沢 大磯地域に分布する火山岩類の K Ar 年代と南部フォッサマグナ地域における鮮新世火山フロントの西方移動 K Ar ages of volcanic rocks in the Tanzawa Oiso area, central Japan: Implication for westward migration of the Pliocene volcanic front in the southern Fossa Magna region 森慎一(Shin'ichi MORI) 山下浩之(Hiroyuki YAMASHITA)  有馬眞(Makoto ARIMA)   藤岡換太郎(Kantaro FUJIOKA)    We determined K Ar ages of the late Miocene to Pliocene andesitic to basaltic dykes and lavas distributed in the Tanzawa Oiso area in the southern Fossa Magna region, central Japan. Our data indicate two distinct periods of volcanic activity in this region; one took place during the middle Miocene (about 15 Ma) and another during the late Miocene to Pliocene (7.5 4.2 Ma). Combined the present results with the age data reported previously from volcanic rocks in the southern Fossa Magna region, the present study suggests that the volcanic front in this region during 8 to 4 Ma was located at about 40 km east of the present-day volcanic front. The volcanic front began to migrate westward to the present-day location at about 4 Ma. The westward migration of volcanic front was probably associated with an abrupt change of lateral motion of the Philippine Sea Plate from north-northwestward to northwestward occurred between 4 and 2 Ma.

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Volcanostratigraphy of the Lower Pleistocene in the northern flank of the Northern Yatsugatake volcanoes, central Japan.

Cited by 7 publications

References 34 publications

Effect of subduction components on production of basalts from Tateshina volcano, central Japan: geochemical calculation of dehydration of subducting oceanic crust and partial melting of overlying sediments, and subsequent fluid-mantle interaction

Effect of subduction components on production of basalts from Tateshina volcano, central Japan: geochemical calculation of dehydration of subducting oceanic crust and partial melting of overlying sediments, and subsequent fluid-mantle interaction

Quaternary volcanism and tectonic history of the Suwa–Yatsugatake Volcanic Province, Central Japan

K-Ar ages of volcanic rocks in the Tanzawa-Oiso area, central Japan: Implication for westward migration of the Pliocene volcanic front in the southern Fossa Magna region

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