The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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40Ar-39Ar Age Determination for the Quaternary Basaltic Rocks in Jeongok Area

전곡 지역 제4기 현무암질 암석의 40Ar-39Ar 연대 측정

  • Kim, Jeongmin (Division of Earth and Environmental Science, Korea Basic Science Institute) ;
  • Choi, Jeong-Heon (Division of Earth and Environmental Science, Korea Basic Science Institute) ;
  • Jeon, Su In (Division of Earth and Environmental Science, Korea Basic Science Institute) ;
  • Park, Ul Jae (Radioisotope Research Division, Korea Atomic Energy Research Institute) ;
  • Nam, Seong Soo (Radioisotope Research Division, Korea Atomic Energy Research Institute)
  • 김정민 (한국기초과학지원연구원 환경과학연구부) ;
  • 최정헌 (한국기초과학지원연구원 환경과학연구부) ;
  • 전수인 (한국기초과학지원연구원 환경과학연구부) ;
  • 박울재 (한국원자력연구원 동위원소이용연구본부) ;
  • 남성수 (한국원자력연구원 동위원소이용연구본부)
  • Received : 2014.10.31
  • Accepted : 2014.12.18
  • Published : 2014.12.31
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Abstract

Quaternary basaltic rocks occur as volcanic plateau and/or river cliff in the watershed area of Hantan River in Jeongok, central Korea. We measured $^{40}Ar-^{39}Ar$ ages for the basaltic rocks from Jeongok area using the multi-collector noble gas mass spectrometer and laser heating device introduced for the first time in Korea. The basaltic rocks from the river cliff in Eundae-ri area show the systematic change in $^{40}Ar-^{39}Ar$ ages from $0.54{\pm}0.07Ma$ through $0.48{\pm}0.01Ma$ to $0.12{\pm}0.01Ma$ toward the top. The other sample from Jeongok-ri area yields the age of $0.43{\pm}0.04Ma$. This results suggest that there might be a episodic volcanic eruption between 0.12-0.54 Ma in Jeongok area.

한반도 중부 전곡 지역 한탄강 유역에는 제4기 시기에 분출한 현무암질 암석들이 화산대지 및 하식절벽으로서 분포한다. 국내 최초로 도입된 다검출기 불활성기체 질량분석기와 레이저 가열장치를 이용하여 전곡 지역에서 산출하는 현무암질 암석의 $^{40}Ar-^{39}Ar$ 연대를 측정하였다. 전곡읍 은대리 지역 하식절벽의 현무암들은 하부에서 상부로 가면서 $0.54{\pm}0.07Ma$, $0.48{\pm}0.01Ma$, $0.12{\pm}0.01Ma$의 연대를 나타내며 전곡리 지역의 현무암에서 $0.43{\pm}0.04Ma$의 연대가 얻어진다. 이 결과는 0.12-0.54 Ma 사이에 전곡 지역에 단속적인 화산암의 분출이 있었을 가능성을 시사한다.

Keywords

References

  1. Bae, K., Bae, C.J. and Kim, K., 2012, The age of Paleolithic handaxes from the Imjin-Hantan River Basins, South Korea. Quaternary International, 281, 14-25. https://doi.org/10.1016/j.quaint.2012.06.021
  2. Choi, M.C., 1982, Report of the third excavation in Cheonkok Palaeolithic site. Journal of Liberal Art, Kon-kuk University, 14, 207-238.
  3. Choi, H.-O. Choi, S.H. and Yu, Y., 2014, Isotope geochemistry of Jeongok basalts, northernmost South Korea: Implications for the enriched mantle end-member component. Journal of Asian Earth Sciences, 91, 56-68. https://doi.org/10.1016/j.jseaes.2014.05.010
  4. Kee, W.-S., Lim, S.-B., Kim, H., Kim, B.C., Hwang, S.K., Song, K.-Y. and Kihm, Y.-H., 2008, Geological Report of the Yeoncheon sheet (1:50,000). Korea Institute of Geoscience and Mineral Resources, 103p.
  5. Nagaoka, S., Danhara, T., Itaya, T., Sakuyama, T., Watanabe, M., Bae, K., and Matsufuji, K., 2008, Stratigraphy and age of Quaternary basaltic lavas and reconstruction of paleogeography in Chongokni, Korea. In: Matsufuji, K. (ed.), Loess-paleosol and Paleolithic Choronology in East Asia. Yuzankaku, Tokyo, p. 87-102.
  6. Nomade, S., Renne, P.R., Vogel, N., Deino, A.L., Sharp, W.D., Becker, T.A., Jaouni, A.R. and Mundil, R., 2005, Alder Creek sanidine (ACs-2): A Quaternary $^{40}Ar/^{39}Ar$ dating standard tied to the Cobb Mountain geomagnetic event. Chemical Geology, 218, 315-338 https://doi.org/10.1016/j.chemgeo.2005.01.005
  7. Park, K.-H., Kim, Y.J., Lee, I.-S., Park, J.B., Choi, M.-S., Lee, K.-S., Cheong, C.-S., Han, J.-H., Lee, S.-H. and Shin, H.-S., 1996, Research for the trace element and structure analyses for geological and oceanographic samples (I), UCPN00010-025-4, Korea Basic Science Institute, 34-37.
  8. Ryu, S., Oka, M., Yagi, K., Sakuyama, T. and Itaya, T., 2011, K-Ar ages of the Quaternary basalts in the Jeongok area, the central part of Korean Peninsula. Geoscience Journal, 15, 1-8. https://doi.org/10.1007/s12303-011-0008-x
  9. Sakuyama, T., Nagaoka, S., Miyazaki, T., Chang, Q., Takahashi, T., Hirahara, Y., Senda, R., Itaya, T., Kimura, J. and Ozawa, K., 2014, Melting of the uppermost metasomatized asthenosphere triggered by fluid fluxing from ancient subducted sediment: Constraints from the Quaternary basalt lavas at Chugaryeong volcano, Korea. Journal of Petrology, 499-528.
  10. Steiger, R. and Jager, E., 1977, Subcommission on geochronology: convention on the use decay constants in geo and cosmochronology. Earth and Planetary Science Letters, 36, 359-362. https://doi.org/10.1016/0012-821X(77)90060-7
  11. Won, C.K. and Lee, M.W., 1988, The study on petrology for the Quaternary alkali volcanic rock of the Korean Peninsula. Journal of the Geological Society of Korea, 24, 181-193.
  12. Won, C.K., Kim, Y.K. and Lee., M.W., 1990, The study on the geochemistry of Choogaryong alkali basalt. Journal of Geological Society of Korea, 26, 7-81.
  13. Yang, L., Wang, F., Feng, H., Wu, L. and Shi, W., 2014, $^{40}Ar/^{39}Ar$ geochronology of Holocene volcanic activity at Changbaishan Tianchi volcano, Northeast China. Quaternary Geochronology, 21, 106-114. https://doi.org/10.1016/j.quageo.2013.10.008

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