Research press release


Nature Geoscience

Tracking plates in the subsurface

複雑なテクトニクス的状態にある日本列島中央部では、2つの海洋プレートが重なり合ってマントルへと沈み込んでおり、その結果、流体の放出とマントルの融解および火山活動が生じている。Nature Geoscience(電子版)に発表される研究は、全体の流体収支に対するそれぞれのプレートの相対的寄与を定量化して地下のプレートの配置を明らかにしている。



In the complex tectonic setting of central Japan, two oceanic plates overlap with each other as they sink into the mantle, resulting in fluid release, mantle melting and volcanism. A study published online this week in Nature Geoscience quantifies the relative contribution of each plate to the overall fluid budget and helps clarify the subsurface configuration of the plates.

Hitomi Nakamura and colleagues analysed young volcanic rocks from central Japan to determine the chemical signature of fluids released by the Philippine Sea and Pacific plates as they dip down. They found that the fluid contributed by each plate is chemically distinct and that even though the plates overlap, the Philippine Sea plate appears not to block fluid released from the underlying Pacific plate.

The data suggest that chemical signatures of plate-derived fluids can be used to understand the geometry of subducting plates and hence the seismicity such settings.

doi: 10.1038/ngeo200


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