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LA-MC-ICPMS U-Pb Ages of the Detrital Zircons from the Baengnyeong Group: Implications of the Dominance of the Mesoproterozoic Zircons

신원생대 백령층군 사암의 쇄설성 저어콘 LA-MC-ICPMS U-Pb 연령: 중원생대 집중연령의 의미

  • Kim, Myoung Jung (Division of Earth and Environmental Sciences, Pukyong National University) ;
  • Park, Jeong-Woong (Soong-Moon High School) ;
  • Lee, Tae-Ho (Division of Earth and Environmental Sciences, Pukyong National University) ;
  • Song, Yong-Sun (Division of Earth and Environmental Sciences, Pukyong National University) ;
  • Park, Kye-Hun (Division of Earth and Environmental Sciences, Pukyong National University)
  • 김명정 (부경대학교 일반대학원 지구환경시스템과학부) ;
  • 박정웅 (숭문고등학교) ;
  • 이태호 (부경대학교 일반대학원 지구환경시스템과학부) ;
  • 송용선 (부경대학교 일반대학원 지구환경시스템과학부) ;
  • 박계헌 (부경대학교 일반대학원 지구환경시스템과학부)
  • Received : 2016.10.04
  • Accepted : 2016.12.16
  • Published : 2016.12.28

Abstract

The U-Pb ages of detrital zircons from the Baengnyeong Group were determined by LA-MC-ICPMS, yielding condensed age population in the range from 1100 Ma to 1800 Ma corresponding to the Mesoproterozoic to late Paleoproterozoic. However, detrital zircons of ca.1800-2000 Ma or ca. 2500 Ma ages, which appear frequently in the lower Paleozoic Joseon Supergroup and the upper Paleozoic Pyeongan Supergroup are lacking in the Baengnyeong Group. Such characteristics are identical to those of the Neoproterozoic Sangwon System of North Korea, suggesting that the Baengnyeong Group might be the southwestern extension of the Sangwon System. The zircon age distribution patterns from the Impi Formation in the Gunsan area closely resemble those of the Baengnyeong Group, implying possible correlation of the Impi Formation to the Sangwon System. Therefore, the Mesoproterozoic detrital zircons reported from the Hwangangni Formation of the Okcheon Metamorphic Belt and the Myobong, Sambangsan and Sesong Formations of the Taebaeksan Basin might be derived from the provenances within the Korean peninsula.

Acknowledgement

Supported by : 부경대학교

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