The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Detrital zircon U-Pb Ages of the Metapelite on the Southwestern Part of the Ogcheon Belt and Its Stratigraphical Implication

옥천대 남서부 지역 저변성퇴적암의 SHRIMP U-Pb 저어콘 연대와 층서적 의미

  • Choi, Sung-Ja (Geological Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Dong-Yeon (Geological Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Cho, Deung-Lyong (Geological Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, You Bong (Geological Research Division, Korea Institute of Geoscience and Mineral Resources)
  • 최성자 (한국지질자원연구원 국토지질연구본부) ;
  • 김동연 (한국지질자원연구원 국토지질연구본부) ;
  • 조등룡 (한국지질자원연구원 국토지질연구본부) ;
  • 김유봉 (한국지질자원연구원 국토지질연구본부)
  • Received : 2014.12.17
  • Accepted : 2015.02.02
  • Published : 2015.03.30
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Abstract

We investigated the zircon U-Pb ages of the metapelites from the Sungjeon-myeon Gangjin-gun, the southwestern Ogcheon belt, to provide geochronological constraints for the depositional age as well as the distribution of Late Paleozoic formation. Data from the detrital zircons are mostly concordant, yielding four major age groups: (1) Neoarchean (~2.5 Ga); (2) Paleoproterozoic (~1.86 Ga, Statherian); (3) Middle Devonian(~390 Ma); and (4) Late Paleozoic (~322 Ma, Serpukhobian). The youngest zircon age gives a weighted mean $^{206}Pb/^{238}U$ age of $322{\pm}4.8$ Ma (n=16, MSWD=4.9), indicating deposition age of Early Carboniferous(Serpukhobian) or after. Therefore, the metapelites is considered to be the lowest Formation of the late Paleozoic Pyeongan Supergroup correlated with the Manhang Formation of the Samcheock coal fields and the Oeumri Formation(the Middle to Late Carboniferous) of the Hwasun coal field.

옥천대 남서부 강진군 성전면에 노출된 저변성이질암에 대해 저어콘 U-Pb 연령측정을 실시하여 퇴적층의 지질시대를 규명하고, 상부고생대의 연장 분포를 제시하고자 한다. 이질암층에서 분리한 저어콘의 분석값은 대부분 일치곡선에 도시되며, 주요한 4개의 연령군으로 나뉜다: (1) 시생대(약 ~2.5 Ga), (2) 고원생대 후기(~1.86 Ga), (3) 데본기 중기(390 Ma), (4) 전기 석탄기(322Ma). 성전면 이질암층에서 분리한 저어콘에서 가장 젊은 $^{206}Pb/^{238}U$ 가중평균연령은 $322{\pm}4.8$ Ma(n=16, MSWD=4.9)이며, 이는 성전면 이질암층의 퇴적시기가 전기 석탄기(Serpukhobian) 내지 그 이후임을 지시한다. 따라서, 성전면 이질암층은 삼척탄전의 만항층과 대비되는 상부고생대 평안누층군의 기저층으로 간주할 수 있으며, 중기 내지 후기 석탄기 오음리층에 대비할 수 있다.

Keywords

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