• Title/Summary/Keyword: 함석

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Petrochemistry of Garnet-bearing Metabasite in Marble at Shinri area in Hongseong and its Tectonic Implication (홍성 신리 지역 대리암 내 함석류석 변성염기성암의 암석지화학 연구 및 그 지구조적 의미)

  • Kim, Sung-Won;Koh, Hee-Jae
    • The Journal of the Petrological Society of Korea
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    • v.19 no.3
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    • pp.209-225
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    • 2010
  • The Shinri area near the Yedang Lake, the eastern part of the Hongseong area in SW Gyeonggi Massif, consists of the Neoproterozoic Duckjeongri granodiorite-tonalite, mylonitized amphibole-bearing orthogneiss and impure marble with lens-shaped garnet-bearing metabasites. In this paper, we report mineralogical and geochemical data of Neoproterozoic lens-shaped garnet-bearing metabasites within marble of the Shinri area. The $SiO_2$ contents of garnet-bearing metabasites in marble vary between ~46.98 and 51.17 wt%, and the $Na_2O$ + $K_2O$ contents fall between ~1.95 and 2.85 wt%, similar to the tholeiitic sub-alkaline basaltic rocks. In the Zr/Y vs. Zr diagram, garnet-bearing metabasites also plot in the subalkaline basaltic rocks. The chondrite-normalized REE patterns for Shinri garnet-bearing metabasites show relatively flat patterns to that of chondrite. They show slight LREE-enriched and depleted patterns. The major and trace element data from lens-shaped garnet-bearing metabasites in marble of the Shinri area suggest that these rocks were formed in within plate. In contrast, previous major and trace element data of high pressure type garnet-bearing metabasites from the mafic-ultramafic complex in the Baekdong and Bibong areas suggest that these rocks were formed in a nascent arc to backarc spreading center within subduction zone setting. Based on mineral assemblage and mineral chemistry, P-T estimates for Shinri garnet-bearing metabasites are 9.6-12.7 kb, $695-840^{\circ}C$ for inclusions in the core, and 9.6-13.6 kb, $630-755^{\circ}C$ for those in the rim. These P-T estimates are distinct from those of the Baekdong and Bibong garnet-bearing metabasites with isothermal decompressional retrograde P-T path. In addition to Triassic tectonic activity previously reported in the Shinri area of Hongseong, the details of metamorphic history such as protolith age and Neo-Proterozoic metamorphic episode need to be solved.

특별 재난지역이 아닌 특별 재앙지역에서 보낸 한철

  • Kim, Nam-Geuk
    • River and Culture
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    • v.2 no.4
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    • pp.89-101
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    • 2006
  • 끊어진 길과 넘어진 전봇대, 굴러 내려온 나무들 사이로 하진부 3리 모낼골 입구에 도착했을때, 나는 말과 생각이 확 멈춰버렸다. 골짜기 입구에 있던 네 집 중 세 집이 사라진 것이다. 길도 사라지고 사람도 사라졌다. 흙 위로 삐죽 올라온 함석이 그곳에 집이 있었다고 알려줄 뿐이었다. 이집 노인들은 다 어디로 갔을까, 저 흙 속에 묻힌 것일까, 살아는 있을까.

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전자부품 플라스틱 패키지의 신뢰성과 습기 영향

  • Im, Ji-Hyuk;Park, Hui-Jin;Ham, Seok-Jin
    • Journal of the KSME
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    • v.52 no.7
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    • pp.45-49
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    • 2012
  • 폴리머 재료들이 포함된 전자 패키지의 신뢰성 문제는 습기의 영향이 매우 크다. 습기와 연관된 파손을 분석하기 위해서는 폴리머 재료들의 흡습 특성을 측정하는 것이 매우 중요하며, 습기 확산 메커니즘 및 폴리머의 손상과 접착력 저하에 대한 엄밀한 연구가 필요하다.

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