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Petrogenesis of the Kaikomagatake granitoid pluton in the Izu Collision Zone, central Japan: implications for transformation of juvenile oceanic arc into mature continental crust

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Abstract

The Miocene Kaikomagatake pluton is one of the Neogene granitoid plutons exposed in the Izu Collision Zone, which is where the juvenile Izu-Bonin oceanic arc is colliding against the mature Honshu arc. The pluton intrudes into the Cretaceous to Paleogene Shimanto accretionary complex of the Honshu arc along the Itoigawa-Shizuoka Tectonic Line, which is the collisional boundary between the two arcs. The pluton consists of hornblende–biotite granodiorite and biotite monzogranite, and has SiO2 contents of 68–75 wt%. It has high-K series compositions, and its incompatible element abundances are comparable to the average upper continental crust. Major and trace element compositions of the pluton show well-defined chemical trends. The trends can be interpreted with a crystal fractionation model involving the removal of plagioclase, biotite, hornblende, quartz, apatite, and zircon from a potential parent magma with a composition of ~68 wt% SiO2. The Sr isotopic compositions, together with the partial melting modeling results, suggest that the parent magma is derived by ~53% melting of a hybrid lower crustal source comprising ~30% Shimanto metasedimentary rocks of the Honshu arc and ~70% K-enriched basaltic rocks of the Izu-Bonin rear-arc region. Together with previous studies on the Izu Collision Zone granitoid plutons, the results of this study suggest that the chemical diversity within the parental magmas of the granitoid plutons reflects the chemical variation of basaltic sources (i.e., across-arc chemical variation in the Izu-Bonin arc), as well as a variable contribution of the metasedimentary component in the lower crustal source regions. In addition, the petrogenetic models of the Izu Collision Zone granitoid plutons collectively suggest that the contribution of the metasedimentary component is required to produce granitoid magma with compositions comparable to the average upper continental crust. The Izu Collision Zone plutons provide an exceptional example of the transformation of a juvenile oceanic arc into mature continental crust.

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Acknowledgments

We thank Timothy L. Grove for editorial handling. We also thank two anonymous reviewers for their thoughtful and constructive reviews of an earlier version of this manuscript. We are also grateful to Y. Motoyoshi, K. Shiraishi, and K. Seno for their analytical support. S.S. thanks T. Kanamaru, H. Kamiyama, and S. Atsuta for discussions during field excursions in the Kaikomagatake pluton. We are grateful to F.J. Korhonen and A.R.L. Nichols for helping to improve the English and various comments. This study was partly supported by a Sasakawa Scientific Research Grant from the Japan Science Society (14–305) to S.S. and the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research (12440147, 13373005) to M.A.

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  1. Satoshi Saito

    Present address: Research Institute for Humanity and Nature, 457-4 Motoyama, Kamigamo, Kita-ku, Kyoto, 603-8047, Japan

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  1. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-Cho, Yokosuka, Kanagawa, 237-0061, Japan

    Satoshi Saito, Kenichiro Tani, Takashi Miyazaki, Ryoko Senda, Qing Chang, Toshiro Takahashi, Yuka Hirahara & Jun-Ichi Kimura

  2. Geological Institute, Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Makoto Arima

  3. Geological Museum, Geological Survey of Japan, AIST Central-7, 1-1-1 Higashi, Tsukuba, 305-8567, Japan

    Takashi Nakajima

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410_2011_689_MOESM5_ESM.tif

Representative microstructures in the Kaikomagatake pluton. Qtz; quartz, Pl; plagioclase, Kfs; K-feldspar, Hbl; hornblende, Bt; biotite. a Equigranular texture of undeformed rock. Cross-polarized light. b Deformed K-feldspar. The fracture in K-feldspar is filled with quartz and hornblende. Cross-polarized light. c Deformed quartz and biotite. Cross-polarized light (TIFF 2,459 kb)

410_2011_689_MOESM6_ESM.tif

Calculated weight proportions of fractionated crystal phases and residual melt in the fractional crystallization modeling (TIFF 2,179 kb)

410_2011_689_MOESM7_ESM.tif

SiO2 vs K2O/Na2O diagram showing experimental melt (shaded area) and starting material compositions of Nakajima and Arima (1998) and Sisson et al. (2005). The compositional fields of volcanic rocks (SiO2 < 61 wt%) from the Izu-Bonin arc volcanic front region (Taylor and Nesbitt 1998; Hochstaedter et al. 2000) and rear-arc region (Hochstaedter et al. 2000; Machida and Ishii 2003) are shown for comparison. The parent magma compositions of the Kaikomagatake pluton and the Tanzawa plutonic complex (Kawate and Arima 1998) are also shown (TIFF 2,896 kb)

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Saito, S., Arima, M., Nakajima, T. et al. Petrogenesis of the Kaikomagatake granitoid pluton in the Izu Collision Zone, central Japan: implications for transformation of juvenile oceanic arc into mature continental crust. Contrib Mineral Petrol 163, 611–629 (2012). https://doi.org/10.1007/s00410-011-0689-1

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