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NTIS 바로가기자원환경지질 = Economic and environmental geology, v.52 no.5, 2019년, pp.459 - 469
황상구 (안동대학교 자연과학대학 지구환경과학과) , 안웅산 (제주특별자치도 세계유산본부) , 이소진 (안동대학교 기초과학연구소) , 오경식 (안동대학교 공과대학 신소재학부)
We present a quantitative evaluation of density, vesicularity and microtextures for coarse lapilli collected from the Jugam Scoria Deposits, northeastern Ulleung Island. Lapilli from the deposits have modal vesicularities of 61% in the lower part and 67% in the upper part, and vesicle populations do...
핵심어 | 질문 | 논문에서 추출한 답변 |
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울릉도는 무엇인가? | 울릉도는 동해 서부에 발달하는 울릉 분지의 북변부에 위치하며 약 2,200 m 깊이의 심 해저에서 해수면 위로 984.6 m까지 솟아있는 화산이다(Fig. 1a). | |
라필리의 종류로 무엇이 있는가? | 라필리는 대개 적철유리로 이루어진 적갈색 S형 라필리(Fig. 2a, b), 흑철유리로 이루어진 암회색 T형 라필리(Fig. 2d. e) 와 적철유리와 흑철유리로 이루어진 암갈색 ST형 라필리가 있다(Fig. 2c). 화산탄은 외 연부가 적철유리이고 중심부가 흑철유리로 이루어져있다. | |
죽암분석층의 두께는 어느 정도인가? | 석포조면암과 말잔등응회암 위에 놓이며 대체로 불규칙한 기존 지형을 덮고 있다. 두께는 근거리 부(proximal part)에서 최고 약 20 m 정도이다. 그리고 이 분석 층은 다른 암층에 의해 덮이지 않기 때문에 울릉 화산의 모든 암층들 중에서 가장 젊은 것으로 보았다(Hwang et al. |
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