...Although there are no shallow earthquake chains like those in the mid-ocean ridge, nor deep earthquake zones like those in island arcs, island arc-type calc-alkaline and felsic rocks have been collected, and the Mohorovicic discontinuity is deeper than the ocean floor. They are thought to be ancient remnant arcs that were left behind in the marginal sea when the Philippine Sea floor (West Philippine Basin, Shikoku Basin, and Parece Vela Basin) spread. The Yamato Bank and Kita-Yamato Bank in the Sea of Japan are also types of ancient island arcs. ... *Some of the terminology that mentions "remnant arc" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…これらに沿っては大洋中央海嶺のような浅い地震の列も,島弧のような深発地震面もみられないが,島弧型のカルクアルカリ岩やケイ長質岩石が採集されており,モホロビチッチ不連続面の深さも海洋底よりも深い。フィリピン海の海底(西フィリピン海盆や四国海盆,パレスベラ海盆)が拡大した時に縁海の背後に取り残された古島弧remnant arcであろうとされている。日本海の大和堆,北大和堆も古島弧の一種である。… ※「remnant arc」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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