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U–Pb ages of Miocene near-trench granitic rocks of the Southwest Japan arc: implications for magmatism related to hot subduction

Published online by Cambridge University Press:  07 November 2019

Hironao Shinjoe Open the ORCID record for Hironao Shinjoe [Opens in a new window] ,
Yuji Orihashi  and
Ryo Anma
Hironao Shinjoe*
Affiliation:
Tokyo Keizai University, 1-7-34 Minami-cho Kokubunji, Tokyo185-0021, Japan
Yuji Orihashi
Affiliation:
Department of Earth and Environmental Sciences, Faculty of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Amori036-8561, Japan
Ryo Anma
Affiliation:
Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minami-josanjima, Tokushima770-8506, Japan
*
Author for correspondence: Hironao Shinjoe, Email: [email protected]
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Abstract

We present a new dataset of zircon U–Pb ages that document igneous activity in the SW Japan arc during middle Miocene time and discuss its relationship with the opening of the Japan Sea, Philippine Sea plate migration, and subduction of the young hot lithosphere of the Shikoku Basin. Precursory magmatism, characterized by dike and stock intrusions, started c. 15.6 Ma in both Kyushu and the Kii Peninsula. Most plutonism occurred between 15.5 and 13.5 Ma in an area 600 km long and 150 km wide. No along-arc trend was recognized in the U–Pb ages of igneous activity near the trench. Our data indicate that all near-trench middle Miocene igneous activity occurred immediately after the opening of the Japan Sea ceased, i.e. after 16 Ma, implying that melt extraction and the emplacement of granites in the near-trench region had some influence on the back-arc opening. Our data also imply that the trench–trench–trench-type triple junction between the Japan arc and the Izu–Bonin–Mariana arc must have reached the east side of the Kii Peninsula by 15.6 Ma. The wide distribution of contemporaneous magmatic activity along the arc requires a trench-parallel heat source, such as the subduction of a trench-parallel ridge or a young and highly segmented ridge–fracture zone system in addition to the hot wedge mantle condition related to the opening of Japan Sea.

Keywords

zirconPhilippine Sea plateJapan Seafelsic rocks
Type
Original Article
Information
Geological Magazine , Volume 158 , Special Issue 1: Subduction zone processes and crustal growth mechanisms at Pacific-Rim continental margins: modern and ancient analogues , January 2021 , pp. 47 - 71
Copyright
© Cambridge University Press 2019

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