Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

ID-TIMS single zircon age determination of mangerite in the eastern Gyeonggi massif, Korea

경기육괴 동부 맨거라이트에 대한 저어콘 단일 입자 열이온화질량분석법 연대측정

Jeong, Youn-Joong;Yi, Kee-Wook;Kamo, Sandra L.;Cheong, Chang-Sik
정연중;이기욱;;정창식

  • Published : 20080800

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Abstract

Five zircon grains from mangerite in the Odaesan area, eastern Gyeonggi massif were dated using single grain isotope dilution thermal ionization mass spectrometry. The U-Pb age of a low intercept age is 228.69±0.85 Ma, being significantly different from previous report as 257 Ma(Oh et al., 2006a). All the five grains show an upper intercept age of 1878±27 Ma, consistent with the well-known regional Paleoproterozoic event in the Gyeonggi Massif. This study indicates that the application of zircon in analyzed mangerite sample as a SHRIMP working standard leaves more careful investigation.

경기육괴 동부 오대산 지역 맨거라이트를 대상으로 단일입자 저어콘 U-Pb 연대측정을 실시하였다. 저어콘에 대해서 압축공기 마모법과 화학적 마모법으로 나누어 전처리하고 이 중 5개의 입자를 선정하여 분석하였다. 분석된 저어콘 입자 중 하부 교차점 연대인 228.69±0.85 Ma는 기존 보고된 257 Ma(Oh et al., 2006a)와 차이를 보인다. 조화선 그림에 도시된 맨거라이트 시료들은 1878±27 Ma의 상부 교차점 연대를 지시하여 경기육괴에서 기존에 보고되어온 원생대 초기의 연대를 확인한다. 이번 분석결과로 볼 때 맨거라이트 저어콘은 SHRIMP 측정을 위한 표준물질로는 더 검토를 요한다.

Keywords

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