Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Comparison of U-Pb Age Distribution Characteristics of Detrital Zircons in the Age-unknown Geumsusan Formation and Jangsan Formation of the Joseon Supergroup

조선누층군 장산층과 시대미상 금수산층의 쇄설성 저어콘 U-Pb 연령분포 특성 비교

  • Cho, Kyungo (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Park, Kye-Hun (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Song, Yong-Sun (Department of Earth Environmental Sciences, Pukyong National University) ;
  • Choi, Ji Eun (Graduate School of Education, Pukyong National University)
  • 조경오 (부경대학교 환경해양대학 지구환경과학과) ;
  • 박계헌 (부경대학교 환경해양대학 지구환경과학과) ;
  • 송용선 (부경대학교 환경해양대학 지구환경과학과) ;
  • 최지은 (부경대학교 교육대학원 지구과학교육전공)
  • Received : 2019.02.01
  • Accepted : 2019.02.21
  • Published : 2019.02.28
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Abstract

SHRIMP U-Pb ages were analyzed for the detrital zircons separated from the Jangsan Formation of the Lower Paleozoic Joseon Supergroup in the Taebaeksan Basin and the Mungyeong area. Similar to the previously reported from Taebaeksan basin, the detrital zircons show strong peaks near the age of about 1.8-2.0 Ga and about 2.5 Ga. This indicates that the detrital zircons of the Jangsan Formation originated from the basement rocks of the Korean Peninsula. Although the age of the basement rocks on the Korean Peninsula is mainly concentrated in the 1.8-2.0 Ga, the age of about 2.5 Ga is clearly visible in the Jangsan Formation, suggesting that the age distribution of the basement rocks exposed to the surface at that time may be somewhat different from now. The detrital zircons of age-unknown Geumsusan Formation distributed between Danyang and Jecheon also show the U-Pb age distribution with a strong peaks around 1.8-2.0 Ga and 2.5 Ga, which is very similar to that of the Jangsan Formation, suggesting a possibility that the two formations are likely to be correlated.

태백산분지와 문경지역에 분포하는 하부고생대 조선누층군의 장산층에서 분리한 쇄설성 저어콘들에 대하여 SHRIMP U-Pb 연령을 분석하였다. 그 결과 이전에 보고된 태백분지의 장산층 자료와 유사하게 대부분이 약 18-20억년과 약 25억년의 연령 부근에 강한 피크를 보여준다. 이는 장산층의 쇄설성 저어콘이 한반도의 기저암체로부터 유래하였음을 나타낸다. 현재의 한반도 기저암체 연령이 주로 18-20억년에 집중되는 것과는 달리 장산층에서는 약 25억년의 연령이 뚜렷하게 나타나는 것으로 볼 때 당시 지표에 노출된 기저암체의 연령분포가 지금과는 다소 상이했을 가능성이 있다. 단양과 제천 사이에 분포하는 시대미상 금수산층으로부터 분리한 쇄설성 저어콘도 장산층과 매우 비슷하게 18-20억년과 25억년 부근에 강한 피크를 보이는 U-Pb 연령분포 특성을 보여주며, 이는 두 층이 대비될 가능성을 강하게 시사한다.

Keywords

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Fig. 1. Geological map of study area, modified after Hwang et al. (1996) and Kim et al. (2001), showing sample locations.

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Fig. 2. Plane-polarized light thin-section photomicrographs of quartzites from the Geumsusan Formation. a) GSQ-2, (b)GSQ-11, c) GSQ-12, and d) GSQ-12F. Scale bar in all photographs is 0.3 mm.

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Fig. 3. Cathodoluminescence images of the studied detrital zircons. a) Jangsan Formation of Danyang-Taebaek area, b)Jangsan Formation of Mungyeong area, c) Geumsusan Formation (SU samples), and d) Geumsusan Formation (GSQ samples).

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Fig. 4. U-Pb concordia diagrams for the studied samples.

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Fig. 5. Cumulative probability density diagram for the studied samples. The numbers indicate the number of zircon analyses within 10% of the discordancy shown in this diagram. The previously published results of the Jangsan Formation (Lee et al., 2012b) were compared. The presence of strong peaks at about 1.8-2.0 Ga and 2.5 Ga suggests that they originated from a common provenance. See the discussion in the text for a Paleozoic age from a single zircon grain.

Table 1. SHRIMP U-Pb zircon data of the Jangsan Quartzite in the Taebaek Basin

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Table 2. SHRIMP U-Pb zircon data of the Jangsan Quartzite in the Mungyeong area

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Table 2. Continued

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Table 3. SHRIMP U-Pb zircon data of the Geumsusan Quartzite

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Table 3. Continued

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Table 3. Continued.

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Table 3. Continued

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