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Miocene–Holocene volcanism

By
Setsuya Nakada
Setsuya Nakada
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Takahiro Yamamoto
Takahiro Yamamoto
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Fukashi Maeno
Fukashi Maeno
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Published:
January 01, 2016

Abstract

Post-Palaeogene volcanism in Japan is closely related to the evolution of the Japanese island-arc system that was initiated with the Japan Sea opening (JSO) in Early–Middle Miocene times, and is reflected in the distribution of volcanoes and geochemical variations of volcanic rocks presently observed. In the NE Japan Arc at the beginning of the JSO, the volcanic field migrated towards the oceanic side and the isotopic composition of magma temporally changed in the back-arc side of the system. This was likely caused by injection of hot asthenosphere into the mantle wedge and damming of the subducting slab. During the JSO, rift volcanism in the back-arc region was characterized by numerous grabens that filled with voluminous volcanic rocks derived from bimodal low-K tholeiitic basalt and silicic magmas. In the SW Japan Arc, a period of Middle Miocene forearc volcanism at 147–12 Ma was fed by high-magnesium andesite and caldera-forming silicic magma, and is interpreted as a result of subduction initiation associated with the oceanwards migration of the SW Japan Arc and under-thrusting of the hot Shikoku Basin.

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Geological Society, London, Geology of Series

The Geology of Japan

Teresa Moreno
Teresa Moreno
Institute of Environmental Assessment and Water Research (IDæA), Spanish National Research Council (CSIC), Barcelona, Spain
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Simon Wallis
Simon Wallis
Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Japan
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Tomoko Kojima
Tomoko Kojima
Department of Earth and Environmental Sciences, Graduate School of Science and Technology, Kumamoto University, Japan
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Wes Gibbons
Wes Gibbons
WPS, 08870 Sitges, Barcelona, Spain
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Geological Society of London
ISBN electronic:
9781862397064
Publication date:
January 01, 2016

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