Korean Journal of Mineralogy and Petrology (광물과 암석)

The Petrological Society of Korea & The Mineralogical Society of Korea (한국암석학회 & 한국광물학회)
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Zircon U-Pb and Rare Earth Elements Analyses on Banded Gneiss in Euiam Gneiss Complex, Central Gyeonggi Massif: Consideration for the Timing of Depositional Event and Metamorphism of the Basement Rocks in the Gyeonggi Massif

경기육괴 중부 의암 편마암 복합체 호상편마암의 저어콘 U-Pb 연령과 미량원소: 경기육괴 기반암의 퇴적 시기와 변성작용에 대한 고찰

  • Lee, Byung Choon (Geology Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Cho, Deung-Lyong (Geology Division, Korea Institute of Geoscience and Mineral Resources)
  • 이병춘 (한국지질자원연구원 국토지질연구본부 지질연구센터) ;
  • 조등룡 (한국지질자원연구원 국토지질연구본부 지질연구센터)
  • Received : 2022.08.09
  • Accepted : 2022.09.21
  • Published : 2022.09.30
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Abstract

The zircon U-Pb and trace element analyses were performed for banded gneiss in the Euiam gneiss complex, central Gyeonggi Massif. An age of detrital zircon shows predominant age peaks at ca. 2500-2480 Ma with numerous ages ranging from Siderian to Rhyacian period. The youngest age peak of detrital zircon constrains the maximum deposition age of protolith of banded gneiss at ca. 2070 Ma. Meanwhile, the zircon rim yielded metamorphic age of ca. 1966 ± 39 Ma ~ 1918 ± 13 Ma. Based on the error range, degree of discordancy, and value of mean squared weighted deviation, we considered that the age of 1918 ± 13 Ma is the most reasonable age indicating the timing of metamorphism for banded gneiss. The zircon rims yield Ti-in-zircon crystallization temperature of 690-740℃. Therefore, we suggested that there was a high-grade metamorphic event in the Gyeonggi Massif at ca. 1918 Ma which is older than the metamorphic event that occurred in the Gyeonggi Massif during ca. 1880-1860 Ma.

경기육괴 중부 의암 편마암 복합체에 분포하는 호상편마암에 대해 저어콘 연대 및 희유원소 분석을 진행했으며 분석 결과를 토대로 경기육괴 기반암류 모암의 퇴적시기와 이들의 변성작용 및 변성시기에 대해 검토하였다. 호상편마암의 쇄설성 저어콘은 신시생대와 고원생대 경계 부근(2500-2480 Ma)에서 가장 두드러진 연령 피크를 보이며 이들과 함께 고원생대 중기 시데로스기부터 라이악스기에 해당하는 다수의 연령이 확인되었다. 쇄설성 저어콘의 가장 젊은 연령 피크는 2070 Ma로 확인되었으며 이는 호상편마암 모암의 퇴적 시기가 적어도 2070 Ma 이후였음을 의미한다. 한편, 저어콘 외연부에서 1966 ± 39 Ma ~ 1918 ± 13 Ma에 해당하는 변성작용 연령이 확인되었으며 오차범위, 불일치도 그리고 평균 제곱 가중편차 값을 고려할 때 1918 ± 13 Ma가 가장 합리적인 변성작용 시기를 지시하는 것으로 보인다. 이들 저어콘 외연부의 결정화 온도는 690-740℃로 확인되었다. 따라서 경기육괴에서는 1880-1860 Ma에 일어난 광역변성작용 이전에도 고도의 변성작용이 있었던 것으로 판단된다.

Keywords

Acknowledgement

논문의 부족한 부분을 개선하도록 유익한 의견을 주신 김형수 교수님과 익명의 심사위원께 감사드립니다. 본 연구는 한국지질자원연구원의 기본사업 GP2020-003과 GP2021-004과제의 일환으로 수행되었습니다.

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