日本鉱物科学会年会講演要旨集
日本鉱物科学会 2018年年会
セッションID: R8-16
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R8:変成岩とテクトニクス
藍閃変成帯に産する高度角閃岩相変成岩の再評価:北米フランシスカン帯の例
原田 夕希花*辻森 樹
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会議録・要旨集 フリー

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So-called `high-grade' blocks of `non-eclogitic' metabasaltic rocks from the Franciscan Complex were petrologically investigated. High Ti content in brown clinoamphibole and the presence of clinopyroxene-rich veins with possibly pseudomorph after orthopyroxene suggest the block underwent nearly granulite-facies metamorphism with migmatitic partial melting. Those rocks might represent fragments of `metamorphic sole' formed during infant stage subduction with a `hot' geothermal gradient, following intra-oceanic subduction initiation.
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