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Petrochemical Characteristics of the Duibaejae Volcanic Rocks from Goseong, Gangwon-do, Korea

강원도 고성 뒤배재 화산암의 암석화학적 특성

  • Kim, Hwa Sung (Taebaek Mechanical Technical High School) ;
  • Kil, Youngwoo (Department of Energy and Resources Engineering, Chonnam National University) ;
  • Lee, Moon Won (Division of Science Education, Kangwon National University)
  • 김화성 (태백기계공업고등학교) ;
  • 길영우 (전남대학교 에너지자원공학과) ;
  • 이문원 (강원대학교 사범대학 과학교육학부)
  • Received : 2013.02.12
  • Accepted : 2013.03.19
  • Published : 2013.04.30

Abstract

Duibaejae basalts from Goseong, Gangwon-do, are divided into the lower basalt and the upper basalt depending on the properties, such as occurrence, mineral compositions, and major and trace compositions of the basalts. The lower basalts have characteristics of agglomerate rocks as well as contain, crustal and mantle xenoliths, and olivine, pyroxene, and plagioclase xenocrysts. The upper basalts with columnar joints contain relatively more mantle xenolith and olivine xenocryst than the lower basalts. The major and trace element compositions suggest that the composition of the upper basalts is close to primary magma composition. Enrichment and depletion patterns of the trace and the rare-earth elements of the lower basalts are similar to those of the upper basalts, whereas the lower basalts are more LREE enriched than the upper basalts. The source magmas of the lower and upper basalts from Duibaejae volcanic edifice were generated from about 0.8-1.2% and 3.7-4.0% batch melting of garnet peridotite, respectively. The abundance of granite xenolith, and plagioclase and quartz xenocrysts with reaction rim indicates that the lower basalts, compared with upper basalts, might have been assimilated with the crustal materials during ascending to surface.

Acknowledgement

Supported by : 전남대학교

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