Geochemical characteristics of ridge-subduction-related granitoids

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  • 中央海嶺沈み込みに伴う花崗岩の地球科学的特徴

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The Taitao Peninsula is the youngest site of ridge subduction in the world, where a young oceanic plate subducts, probably equivalent to the Archean subduction zone. Based on geological evidence and age and composition of the granite, we conclude that the granitic magma was generated over 10 km depth below a fore-arc region, and imply that ridge subduction played an important role in the igneous activity as a heat source. Moreover, REE patterns of granitoid are not necessary good signature of slab melting.

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