• Economic and Environmental Geology
• /
• v.36 no.6
• /
• pp.527-536
• /
• 2003

The Dokdo volcano in the south-central part of the East Sea is classified into 8 rock units. The units and sequence suggest that the Dok Island forms a small stratovolcano constructed from at least 3 times eruption cycles above the sea level and proceeded with transformation of a few different eruption styles during each cycle. Reconstruction of the volcanic form, from the geologic structures and spatial lithofacies changes, suggests that the island is remnants of the southwestern caldera rim of the stratovolcano whose central part lies several hundred meters to the northeast. The subaqueous volcano shows abig guyot, which looks like a shield volcano, that represents gentle slope at 90-175 m deep and relatively steep one in 200∼2,000m, and 25∼30km wise base on sea floor. Therefore the total Dokdo volcano represents a multiple volcano that stratovolcano with small caldera overlies the big guyot.

• The Journal of the Petrological Society of Korea
• /
• v.14 no.4 s.42
• /
• pp.251-263
• /
• 2005

Modern volcanoes, Laoheishan and Huoshaoshan, have erupted during $1720\~1721$ in the Wudalianchi volcanic group, NE china. They comprise scoria and spatter cones that consist of potassium-rich phono-tephritic pyroclastic deposits and lavas, and include wide lava flow fields. The Laoheishan scoria cone is a polygenetic multiple volcano that overlaps earlier and later edifices with more complicated internal structures produced in greater scale and in earlier time than the Huoshaoshan. There is a funnel-shaped crater in the center of the later edifice of the Laoheishan scoria cone. The Huoshaoshan spatter cone is a monogenetic simple volcano with a central pit crater. The volcanic sequences indicate eruption processes that followed a repeated pattern that progressed through 5 stages of explosive and effusive eruption including lava fountains and Strombolian eruptions in the Laoheishan, and a recognizable pattern of 2 stages that started with Strombolian eruption and progressed through lava effusion in the Huoshaoshan.

• The Journal of the Petrological Society of Korea
• /
• v.10 no.1
• /
• pp.13-26
• /
• 2001

Songaksan volcano, which occurs as a monogenetic volcano on the southwestern promontory of Hallasan shield volcano, is composed of tuff ring, cinder cone, lava pond and cinder conelet complex on wide basalt plateau. Except for an influx of external quartz xenocrysts in the tuff ring. Totally the volcano ranges from trachyandesite to trachybasalt in petrography and chemical compositions, which confirm the continuum between the evolved and primitive compositions widely occurring in the Jeju volcanic system. Chemical data for the volcano show quantitative compositional variation from the lower to the upper part of the volcanic sequences. The continuous compositional variations generally define a compositionally zoned magma storage. The chemical data suggest that the compositiona1 donations might have resulted from the fractional crystallization of a parental alkali magma. As result, the Songaksan volcano initially tapped the lop of the zoned magma storage and subsequently erupted successively more primitive magma.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.25 no.10
• /
• pp.1728-1737
• /
• 2001

1760년대 말의 미국문화는 전통적인 가치관에 반발하는 청년문화운동의 화산으로 특징지을 수 있는데 이러한 사회적인 변화는 복식에 새롭고 혁신적인 스타일을 가져오게 되는 요인이 되었다. 특히 이 시기의 미국의 청년층에 의해 일어난 반문화적인 현상으로 인식되어 온 동앙문화의 도입은 미국의 여성복식에 tie-dyeing(홀치기염)패션의 출현으로 복식에 반영되었다. 이에, 본 연구는 지금까지 복식 학자들에 의한 단편적인 추론으로만 설명되어 왔던 1960년대 말 미국여성복식에 나타난 홀치기염 패션의 특성에 관하여 문화적인 배경에 관한 고찰과 함께 이 시기에 출판된 정기 간행물을 연구의 일차자료로 이용하여 실증적으로 분석하는 데 그 목적이 있다. 연구방법으로는 1955년부터 1975년 사이에 출판된 Vogue와 Mademoiselle 잡지에 실린 홀치기염 패션 사진자료를 내용분석법을 이용하여 수집하여 의류품목, 소재, 기법, 디자이너 및 제조업 체에 관한 내용으로 나누어 분석하였다. 연구 결과, 두 종류의 잡지 모두에서 다양한 소재로 만들어진 여러 의류품목에 각종 기법으로 적용되었던 홀치기염 패션이 이 시기에 나타나, 청년층에서 시작되었던 이 패션이 미국의 대중 및 상류층의 복식에도 확산되었음이 밝혀졌다. 나아가 홀치기염 패션스타일이 가장 많이 보여졌던 1969년에서 1971년 사이의 기간은 청년층의 반문화적 현상이 절정을 이루었던 시기와 일치하고 있어서 이러한 급진적인 사회 현상이 그대로 패션에도 반영되고 있음을 알 수 있었다.

• The Journal of the Petrological Society of Korea
• /
• v.27 no.3
• /
• pp.121-138
• /
• 2018

We have examined the petrotectonic setting and magmatic evolution from petrochemical characteristics of major and trace elements for the Cretaceous volcanic rocks in and around the Mireukdo Island. The volcanic rocks, can be devided into Jusasan, Unmunsa, Yokji and Saryang subgroups on the ascending order, are classified as basalt, basaltic andesite, andesite, dacite and rhyolite on TAS diagram. Petrochemical data show that the rocks are calc-alkaline series, and suggest that erupted earlier medium-K series and later high-K series. The volcanic rocks provide a case in which the calc-alkaline magma are formed, not only from separate protoliths, but following separate paths from source to surface. Earlier and later subgroups take different paths to the surface respectively, and are emplaced in the shallow crust as a series of discrete magma chambers through the volcanic processes. After emplacement, each chamber evolves indepently through fractional crystallization with a little assimilation of wall rock. The volcanic rocks have close petrotectonic affinities with orogenic suite and subduction-related volcanic arc. The rhyolitic magma can be derived from calc-alkaline andesitic magma by fractional crystallization with crustal assimilation, which may be derived from a partial melt of peridotite in the upper mantle.