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NTIS 바로가기암석학회지 = The journal of the petrological society of korea, v.27 no.1, 2018년, pp.37 - 47
윤성효 (부산대학교 사범대학 지구과학교육과) , 고정선 (부산대학교 사범대학 지구과학교육과) , 장철우 (부산대학교 대학원 지구과학과)
Volcanic ash samples of historical eruptions from Mt. Baekdu were analyzed for major oxides, trace and rare earth elements by a variety of analytical techniques. The results indicate that the ashes consist of approximately 58.8~71.1 wt.%
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핵심어 | 질문 | 논문에서 추출한 답변 |
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화산재란 무엇인가? | 화산의 분화로 인해 생긴 모래와 실트 크기(직경 2 mm 이하)의 암석, 광물 그리고 화산유리의 미세한 들쭉날쭉한 조각들을 ‘화산재(volcanic ash)’라 부른다 (Fig. 1). | |
화산재의 이화학적 특성은 무엇인가? | 화산재는 불에 탄 목재, 나뭇잎, 또는 종이에 의해 생성되는 부드러운 솜털 같은 연소물이 결코 아니다. 화산재는 딱딱하고, 물에 용해되지 않으며, 강한 연마성과 가벼운 부식성을 가지며, 젖은 경우 전도체가 된다(Heiken, 1974). | |
백두산의 화산재의 K2O 함량은 무엇에 따라 변화하는가? | 백두산의 화산재는 높은 K2O를 성분을 나타내는데, 이는 제 4기 후기동안 일본에서 분출한 많은 화산재에는 포함되어 있지 않은 K-장석이 B-Tm에는 특징적으로 포함되어 있기 때문으로 백두산이 강한 알칼리성을 가지는 마그마로부터 형성되었다는 것을 의미한다(Nakagawa and Ohba, 2002). TiO2가 감소함에 따라 K2O는 증가하다가 감소하는 경향을 나타내며 이는 분출할 때 마그마 속에 K-장석의 함량이 상대적으로 적었다는 것을 의미한다고 할 수 있다. |
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