강원도 고성군 일대의 후기 마이오세 현무암의 암석학적 연구 = Petrology on the Late Miocene Basalts in Goseong-gun, Gangwon Province

다국어 초록 (Multilingual Abstract)

Petrographical and petrochemical analyses for late Miocene basalts in Goseong-gun area, Gangwon province, were carried out to interpret the characteristics and the origin of magma. The basaltic rocks occurred as plug-dome in the summit of several small mountain and developed columnar jointing with pyroxene-megacryst bearing porphyritic texture. And the basalt contains xenoliths of biotite granite (basement rocks), gabbro (lower crustal origin) and lherzolite (upper mantle origin). The basalts belong to the alkaline basalt field in TAS diagram and partly belong to picrobasalt and trachybasalt field. On the tectonomagmatic discrimination diagram for basalt in the Goseong gun area, they fall into the fields for the within plate and oceanic island basalt. The characteristics of trace elements and REEs shows that primary magma for the basalt magma would have been derived from partial melting of garnet-peridotite mantle. This late Miocene basalt volcanism is related to the hot spot within the palte.

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