Structural variations of arc crusts and rifted margins in the southern Izu‐Ogasawara arc–back arc system

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  • Narumi Takahashi
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 3175‐25 Showa‐machi, Kanazawa‐ku, Yokohama 236‐0001 Japan
  • Shuichi Kodaira
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 3175‐25 Showa‐machi, Kanazawa‐ku, Yokohama 236‐0001 Japan
  • Yoshiyuki Tatsumi
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 2‐15 Natsushima‐cho, Yokosuka 237‐0061 Japan
  • Mikiya Yamashita
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 3175‐25 Showa‐machi, Kanazawa‐ku, Yokohama 236‐0001 Japan
  • Takeshi Sato
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 3175‐25 Showa‐machi, Kanazawa‐ku, Yokohama 236‐0001 Japan
  • Yuka Kaiho
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 3175‐25 Showa‐machi, Kanazawa‐ku, Yokohama 236‐0001 Japan
  • Seiichi Miura
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 3175‐25 Showa‐machi, Kanazawa‐ku, Yokohama 236‐0001 Japan
  • Tetsuo No
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 3175‐25 Showa‐machi, Kanazawa‐ku, Yokohama 236‐0001 Japan
  • Kaoru Takizawa
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 3175‐25 Showa‐machi, Kanazawa‐ku, Yokohama 236‐0001 Japan
  • Yoshiyuki Kaneda
    Institute for Research on Earth Evolution Japan Agency for Marine‐Earth Science and Technology 2‐15 Natsushima‐cho, Yokosuka 237‐0061 Japan

抄録

<jats:p>We carried out a reflection/refraction seismic survey across the southern Izu‐Ogasawara arc–back arc system, covering three arcs with different crustal ages. The oldest Eocene arc has middle and lower crust with high velocities of 6.4–6.6 and 6.8–7.4 km/s, respectively, suggesting denser crustal materials. The current volcanic arc has middle and lower crust with lower velocities of 5.7–6.5 and 6.7–7.1 km/s, suggesting advanced crustal differentiation. The crust‐mantle transition layer, with a velocity of 7.5–8.0 km/s, is distributed beneath the current volcanic arc and the rear arc, suggesting a pool of dense materials emanating from the crust through the crustal growth. These structural differences between the Eocene arc and current arc indicate a difference of crustal growth based on basaltic and andesitic magmas according to known petrologic studies. Commonly, rifted crusts have lower crusts with high velocities of over 7.0 km/s, and the arc–back arc transition zone also has a thinner more reflective crust that may have been affected by postrifting magmatism.</jats:p>

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