Aoso-Osore volcanic zone - The volcanic front of the Northeast Honshu arc, Japan.

Nakagawa, Mitsuhiro; Shimotori, Hiroshi; Yoshida, Takeyoshi

doi:10.2465/ganko1941.81.471

Cited by 24 publications

(17 citation statements)

References 8 publications

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“…18): A (Aoso-Osore volcanic zone); S (Sekiryo volcanic zone); M (Moriyoshi volcanic zone); and C (Chokai volcanic zone) (Nakagawa et al 1986). The K-level in volcanic rocks is lowest at the volcanic front side and highest at the back-arc side (Fig.…”

Section: Along-arc Mantle Heterogeneitymentioning

confidence: 99%

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Yoshida

Kimura

Yamada

et al. 2013

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107

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Abstract:We review the evolution of late Cenozoic magmatism in the NE Japan arc, and examine the relationship between the magmatism and the crust-mantle structure. Recent studies reveal secular changes in the mode of magmatic activity, the magma plumbing system, erupted volumes and magmatic composition associated with the evolution of crust-mantle structures related to the tectonic evolution of the arc. The evolution of Cenozoic magmatism in the arc can be divided into three periods: the continental margin (66-21 Ma), the back-arc basin (21-13.5 Ma) and the island-arc period (13.5-0 Ma). Magmatic evolution in the back-arc basin and the island-arc periods appears to be related to the 2D to 3D change in the convection pattern of the mantle wedge related to the asthenosphere upwelling and subsequent cooling of the mantle. Geodynamic changes in the mantle caused back-arc basin basalt eruptions during the back-arc basin opening (basalt phase) followed by crustal heating and re-melting, which generated many felsic plutons and calderas (rhyolite/granite phase) in the early stage of the island-arc period. This was followed by crustal cooling and strong compression, which ensured vent connections and mixing between deeper mafic and shallower felsic magmas, erupting large volumes of Quaternary andesites (andesite phase).Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.The NE Japan arc is a typical island arc associated with a cold subduction zone. It is one of the most well-known island arcs on Earth and provides a useful model for our understanding of how subduction zones produce magmas, including andesites. The NE Japan arc is related to the westward

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Section: Along-arc Mantle Heterogeneitymentioning

confidence: 99%

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Yoshida

Kimura

Yamada

et al. 2013

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107

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“…The chain of volcanoes characterized by hydrous magmatism marked by the presence of phenocrystic hornblende is situated at the front (Nakagawa et al, 1986). Among them, fumarolic activities are widespread at Esan (locality number [28] in Fig.…”

Section: Northeast Japan Arc Southwestern Hokkaido Through Northern mentioning

confidence: 99%

Variation of Cl and SO₃ Contents of Microphenocrystic Apatite in Intermediate to Silicic Igneous Rocks of Cenozoic Japanese Island Arcs: Implications for Porphyry Cu Metallogenesis in the Western Pacific Island Arcs

Imai

2004

Resource Geology

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. Determinations of SO3 and Cl contents of igneous accessory apatite were carried out on Late Cenozoic intermediate to silicic intrusive and volcanic rocks in the Japanese island arcs of the western Pacific rim including the southwestern Kuril arc (eastern Hokkaido), Northeast Japan arc (southwestern Hokkaido through northeastern Honshu to central Honshu), Izu‐Bonin arc, Kyushu‐Palau ridge, Southwest Japan arc (northern Kyushu) and northern Ryukyu arc (southern Kyushu). These were compared to those from the Western Luzon arc, Philippines, to better understand the metallogenesis of porphyry Cu deposits in the western Pacific island arcs. In addition, SO3 and Cl contents of accessory apatite in the Cretaceous magnetite‐series granitic rocks in the Kitakami belt (northeastern Honshu) and the Miocene ilmenite‐series granitic rocks in the Outer Zone of Southwest Japan (southern Kyushu) were also examined. Microphenocrystic apatites in shallow intrusions associated with porphyry Cu deposits in the Western Luzon arc contain >0.1 wt% S as SO3. Such high SO3 contents of microphenocrystic apatite are a common characteristic of hydrous mag‐matism in the Western Luzon arc, from 15 Ma old tonalitic plutonic rocks of the Luzon Central Cordillera to present‐day volcanism at Mount Pinatubo. The accessory apatite in intrusive rocks associated with porphyry Cu deposits, especially those at the Santo Tomas II deposit, show significantly high Cl contents (>2 wt%). The SO3 contents of microphenocrystic apatite in most of the hydrous silicic rocks along the volcanic front, in andesites related to native sulfur deposits, and in Miocene and younger shallow granitic intrusions in northeastern Honshu, are generally <0.1 wt%. On the other hand, the SO3 contents of apatite in such rocks from eastern Hokkaido, southwestern Hokkaido, Izu, northern Kyushu and southern Kyushu are similar to those from the Western Luzon arc. The SO3 contents of accessory apatite in the Cretaceous magnetite‐series granitic rocks in the Kitakami belt are variable, whereas those of the Miocene ilmenite‐series granitic rocks in southern Kyushu are extremely low. The Cl contents of accessory apatite in some rocks of the Northeast Japan arc, Izu‐Bonin arc and Southwest Japan arc are significantly high. In terms of the Cl and SO3 contents of microphenocrystic apatite, Cenozoic Japanese arc magmatism show similarities with arc magmatism associated elsewhere with porphyry Cu mineralization, except for the most of northeastern Honshu of the Northeast Japan arc. Apatite commonly occurs as inclusions in other phenocrystic phases. Thus the variation in SO3 contents of apatite is a feature of early stage magmatic differentiation. The SO3 contents of microphenocrystic apatite are considered to reflect the redox state of the magma source region or fluids encountered during magma generation.

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“…Volcanoes distributed in NE Japan are sub divided into four groups based on the distance from the volcanic front (Nakagawa et al, 1986), which are hereafter called zones 1, 2, 3 and 4 from the trench to backarc-sides in this paper ( Fig. 1(b)).…”

Section: Comparison Of Geochemical Features With Those Of Across-arc mentioning

confidence: 99%

Geochemistry of Quaternary basalts from the Yatsugatake volcano, central Japan: Generation of an unusually deep Wadati-Benioff zone beneath the volcanic front by double-overlapping subduction.

1996

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The Yatsugatake volcano, located on the volcanic front in central Japan, formed above an unusually deep Wadati-Benioff zone (ca. 160 km) as a trench-side volcano. In northeast Japan, incompatible element compositions and 87Sr/86Sr of basalts in the area above the Wadati-Benioff zone where it is ca. 110-170 km deep are clearly different from those where the Wadati-Benioff zone is more than ca. 180 km deep. These differences are inferred to have resulted from the differences in the dehydration reaction at the base of the mantle wedge dragged by the subduction and the contribution from a high 87Sr/86Sr reservoir (probably subcontinental upper mantle): the former zone; amphibole and chlorite dehydration and higher contribution from the high 87Sr/86Sr reservoir, the latter zone; phlogopite dehydration and lower contribution from that. The depth to the Wadati-Benioff zone beneath the Yatsugatake volcano is somewhat shallower than that of phlogopite dehydration, and the basalts show similar ratios between incompatible elements and 87Sr/86Sr to those from the amphibole and chlorite dehydration zone of northeast Japan. These observations show that the Yatsugatake magmas are produced by addition of amphibole and chlorite fluids, and the edifice is situated on the furthest position from the trench above those dehydration zone at the base of mantle wedge. It means that in central Japan there are no Quaternary volcanoes corresponding to the volcanoes in northeast Japan overlying the Wadati-Benioff zone less than ca. 160 km depth, though the amphibole and chlorite at the base of the mantle wedge exceed decomposition pressure (ca. 110 km) beneath the trench side of the Yatsugatake volcano. This can be explained by the effects of subduction of the Philippine Sea plate, over the previously subducting Pacific plate beneath this area. Beneath the forearc-side of the Yatsugatake volcano, through the subduction of the Philippine Sea plate, the temperature of the mantle wedge has been lowered to suppress the generation of mantle diapirs. However, beneath the Yatsugatake volcano, such thermal disturbance has not taken place due to a possible splitting in the subducting Philippine Sea plate, sub-parallel to the subduction direction (NNW) in Miocene to Pliocene. The splitting might have been caused by tearing the Philippine Sea plate into the eastern and western parts in subducting around the Izu-Peninsula. Around the Yatsugatake volcano, the migration of the volcanic front toward the backarc-side is observed during mid-Pliocene (before the changing of the subduction direction of the Philippine Sea plate from NNW to NW), which might have been caused by the process of formation of this double-overlapping subduction zone.

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Aoso-Osore volcanic zone - The volcanic front of the Northeast Honshu arc, Japan.

Abstract: Nasu volcanic zone, which has been considered as the Quaternary volcanic front of the Northeast Honshu arc, Japan, is divided into two zones, Aoso-Osore and Sekiryo volcanic zones. The Aoso-Osore zone, including Aoso, Nanashigure, Osore and Esan volcanoes, are situated at the

Cited by 24 publications

References 8 publications

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Variation of Cl and SO₃ Contents of Microphenocrystic Apatite in Intermediate to Silicic Igneous Rocks of Cenozoic Japanese Island Arcs: Implications for Porphyry Cu Metallogenesis in the Western Pacific Island Arcs

Geochemistry of Quaternary basalts from the Yatsugatake volcano, central Japan: Generation of an unusually deep Wadati-Benioff zone beneath the volcanic front by double-overlapping subduction.

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Aoso-Osore volcanic zone - The volcanic front of the Northeast Honshu arc, Japan.

Abstract: Nasu volcanic zone, which has been considered as the Quaternary volcanic front of the Northeast Honshu arc, Japan, is divided into two zones, Aoso-Osore and Sekiryo volcanic zones. The Aoso-Osore zone, including Aoso, Nanashigure, Osore and Esan volcanoes, are situated at the

Cited by 24 publications

References 8 publications

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Variation of Cl and SO3 Contents of Microphenocrystic Apatite in Intermediate to Silicic Igneous Rocks of Cenozoic Japanese Island Arcs: Implications for Porphyry Cu Metallogenesis in the Western Pacific Island Arcs

Geochemistry of Quaternary basalts from the Yatsugatake volcano, central Japan: Generation of an unusually deep Wadati-Benioff zone beneath the volcanic front by double-overlapping subduction.

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Variation of Cl and SO₃ Contents of Microphenocrystic Apatite in Intermediate to Silicic Igneous Rocks of Cenozoic Japanese Island Arcs: Implications for Porphyry Cu Metallogenesis in the Western Pacific Island Arcs