Estimate of subduction rate of continental crust materials and its effect on mantle convection

2016 Fiscal Year Final Research Report

• Project/Area Number: 26800237
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Ehime University
• Principal Investigator: Ichikawa Hiroki 愛媛大学, 地球深部ダイナミクス研究センター, WPI研究員 (50570503)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 固体地球惑星物理学 / 地球・惑星内部構造 / 大陸地殻 / 島弧の衝突・沈み込み

Outline of Final Research Achievements

The Izu-Bonin arc is considered to be partially subducting underneath the island of Honshu after the vertical collision with Honshu. In this study, 2-D numerical code for the analysis of subduction processes of oceanic arcs was created and calculations are carried out with various parameters. The results show that about 20% of the felsic crust materials in oceanic arcs that are comparable in size to the Izu-Bonin arc can be subducted into about 300 km depth when the temperature of the subducting slab is of the usual value. When the size of the arc is smaller, the subduction rate of felsic crust materials into the deep mantle grows larger.

Free Research Field

固体地球物理学