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Origin and tectonic relationship of metagabbro of the Sambagawa Belt, and associated Karasaki mylonites of western Shikoku, Southwest Japan

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Abstract

The Sambagawa Belt is a subduction-related high-pressure intermediate type metamorphic complex with its protoliths characterized by the ocean plate stratigraphy. The Iyo-nada Sea area of this belt at western Shikoku, Southwest Japan exposes lenticular bodies of metagabbro. Besides, low P/T type metamorphosed Karasaki mylonites occur in this area as an upper structural unit of the Sambagawa Belt. LA-ICP-MS zircon U-Pb dating of the metagabbros in the Sambagawa Belt revealed their crystallization ages of 139–135 Ma as a magmatic event. Trace element composition of zircon suggests that the metagabbros were formed under the arc tectonic setting. Metagabbros do not show any evidence of high P/T metamorphism, instead, they indicate low P/T metamorphism based on the chemical compositional analysis of the hornblende. From the present study, it is constrained that the 139–135 Ma metagabbros were possibly originated as the hanging-wall arc crust. Zircon U-Pb dating of the Karasaki mylonites revealed imprints of multiple tectono-thermal events of 114.3 ± 1.5 Ma (magmatic event), ∼108–105 Ma (metamorphic with or without magmatic event), and 102.4 ± 0.9 Ma (metamorphic event). The first two tectono-thermal events can be correlated with those of the Higo Belt, central Kyushu. However, the last metamorphic event is younger than the tectono-thermal events of the Higo Belt, instead, it coincides with the initial stage tectono-thermal events of Ryoke-San’yo igneous province. Detrital zircon age of the pelitic schist in Karasaki mylonites revealed their origin as Jurassic to earliest Cretaceous sedimentary rock and its age distribution pattern is likely comparable to the previously reported age spectra of Higo metasedimentary rocks and their equivalent rock units. The newly obtained dataset indicates that the Karasaki mylonites are the eastern extension of the late Early Cretaceous Higo Belt.

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Acknowledgments

We are sincerely thankful to Prof. Tomoyuki Shibata for his support during the LA-ICP-MS zircon dating. We also express our gratitude to Mr. Yasuhiro Shibata for his technical assistance during the EPMA measurement. Prof. Masayuki Komatsu and Mr. Yasushi Komoda are thankfully acknowledged for their crucial discussion and support during the fieldwork. Constructive review comments from Prof. Hideo Takagi and an anonymous reviewer have greatly helped to improve the manuscript. We further appreciate the editor Prof. Tatsuki Tsujimori for his insightful comments and handling. Part of the sample for zircon dating (KRS-Gb01) was prepared by Mr. Ataru Kamihigashi. This study was partly supported by Fukada Geological Institute [Fukada Grant-in-Aid] and was partly funded by HiPeR, Hiroshima University.

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Authors and Affiliations

  1. Department of Earth and Environmental Sciences, Jeonbuk National University, 567, Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do, 54896, Republic of Korea

    Kenta Kawaguchi

  2. Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan

    Kenta Kawaguchi, Yasutaka Hayasaka, Kaushik Das & Kosuke Kimura

  3. Hiroshima Institute of Plate Convergence Region Research, 1-3-1, Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan

    Yasutaka Hayasaka, Kaushik Das & Kosuke Kimura

  4. Faculty of Geology, University of Science, Ho Chi Minh City, 227 Nguyen Van Cu Street, Ho Chi Minh City, Vietnam

    Pham Minh

  5. Vietnam National University, Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam

    Pham Minh

  6. National Institute of Technology, Kure College, Agaminami 2-2-11, Kure, Hiroshima, 737-8506, Japan

    Kosuke Kimura

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  3. Pham Minh
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  4. Kaushik Das
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  5. Kosuke Kimura
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Correspondence to Kenta Kawaguchi.

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Electronic supplementary material

Sample preparation and analytical procedures

Table S1

. LA-ICP-MS zircon U-Pb isotopic and age data

Table S2

. Whole-rock major and trace element data and sample location of the five metagabbro samples and ten mafic schist samples

Table S3

. EPMA analytical data of minor element composition of zircon for four metagabbro samples

Table S4

. EPMA analytical data of major element composition of amphibole from two metagabbros and one Karasaki mylonite samples

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Kawaguchi, K., Hayasaka, Y., Minh, P. et al. Origin and tectonic relationship of metagabbro of the Sambagawa Belt, and associated Karasaki mylonites of western Shikoku, Southwest Japan. Geosci J 26, 37–54 (2022). https://doi.org/10.1007/s12303-021-0022-6

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  • DOI: https://doi.org/10.1007/s12303-021-0022-6

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