Have the Japanese Islands Grown?: Five "Japan"s Were Born, and Four "Japan"s Subducted into the Mantle

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  • SUZUKI Kazue
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology
  • MARUYAMA Shigenori
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology
  • YAMAMOTO Shinji
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology
  • OMORI Soichi
    Department of Earth and Planetary Sciences, Tokyo Institute of Technology

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Other Title
  • 日本列島の大陸地殻は成長したのか？―５つの日本が生まれ，４つの日本が沈み込み消失した―
  • ニホン レットウ ノ タイリク チカク ワ セイチョウ シタ ノ カ イツツ ノ ニホン ガ ウマレ ヨッツ ノ ニホン ガ シズミ コミ ショウシツ シタ
  • Have the Japanese islands grown?: five “Japan”s were born, and four “Japan”s were subducted into the mantle
  • Five “Japan”s Were Born, and Four “Japan”s Subducted into the Mantle
  • ―5つの日本が生まれ，4つの日本が沈み込み消失した―

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Description

The Japanese Islands have long been considered to be the most evolved of all the island arcs in the oceans. A simple scenario has been implicitly accepted for the growth of the Japanese Islands: since subduction started sometime around 520 Ma, the TTG crust has increased over time in association with the steady-state growth of the accretionary prism in front. Here, we show very different dynamic growths of TTG crusts over time than previously thought, i.e., four times more TTG crusts than at present must have gone into the deep mantle due to tectonic erosion, which occurred six times since subduction was initiated at 520 Ma. Tectonic erosion is a major process that has controlled the development history of the Japanese islands. It can be traced as a serpentinite mélange belt, which indicates the upper boundary of past extensive tectonic erosion.

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