Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Mineralogical and Geochemical Properties of Clay-silt sediments Exposed in Jangdongri, Naju, Korea

전남 나주시 장동리 지역에 노출된 적갈색 점토-실트 퇴적물의 광물 및 지화학적 특성

  • Kwak, Tae-Hun (Department of Earth and Environmental Sciences, Andong National University) ;
  • Jeong, Gi Young (Department of Earth and Environmental Sciences, Andong National University)
  • 곽태훈 (안동대학교 지구환경과학과) ;
  • 정기영 (안동대학교 지구환경과학과)
  • Received : 2017.01.23
  • Accepted : 2017.03.27
  • Published : 2017.03.31
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Abstract

Reddish brown clay-silt sediments covered granitoid weathering crust in the Jangdongri area, Naju, Korea. Mineralogical and geochemical properties of the ~2 m sediment section were investigated. The sediments were composed mainly of quartz (50%) and clay minerals (45%) with minor contents of K-feldspar, goethite, hematite, and gibbsite. The clay minerals were illite, illite-smectite mixed-layers, vermiculite, hydroxy-Al vermiculite, kaolinite, and halloysite. Mineral composition varied little through the section with the minor upward enrichment of plagioclase and chlorite. Abundant illitic clay minerals indicated the remote source of the sediments because clays derived by granite weathering in Korea were dominated by kaolin minerals. A comparison with the mineral composition of Asian dust (Hwangsa) suggested that plagioclase and K-feldspar disappeared by chemical weathering after deposition, resulting in the quartz and clay-rich sediments. Plagioclase and chlorite altered to kaolin and vermiculite, respectively. Goethite and hematite derived by the weathering of iron-bearing minerals stained the sediment to reddish brown color. The mineralogical and geochemical properties of the reddish brown clay-silt sediments were consistent with those of eolian deposits identified in Korea, supporting eolian origin of the Jangdongri sediments, requiring future confirmation including age dating and isotopic analysis.

전남 나주시 장동리 지역의 화강암 풍화대를 피복하는 적갈색 점토-실트 퇴적물 단면(~2 m)에 대하여 광물학적 및 지화학적 특성 분석을 실시하였다. 퇴적물은 주로 석영(50%)과 점토광물(45%)로 구성되어 있으며, 소량의 K-장석, 침철석, 적철석, 깁사이트로 구성되어 있다. 점토광물은 일라이트(일라이트, 일라이트-스멕타이트 혼합층), 질석(질석, 수산화-Al 질석), 고령석(캐올리나이트, 할로이사이트) 계열의 점토광물로 구성되어 있다. 광물 및 화학조성의 수직 함량변화는 미미하며, 사장석과 녹니석이 전반적으로 결핍되어 있으나 최상부에 소량 함유되어 있다. 점토광물의 주성분이 일라이트 계열이므로 퇴적물의 기원물질은 주변 고령토질 화강암 풍화물이 아니라, 먼 기원지에서 유래한 풍성퇴적물로 판단된다. 현생 황사의 광물조성과 비교하면, 퇴적 후의 심한 화학적 풍화작용으로 사장석과 K-장석이 거의 없어지고, 석영과 점토광물로 구성된 광물학적 특성을 갖게 되었다. 풍화과정에서 사장석과 녹니석은 각각 고령토 광물과 질석으로 변질되었으며, 함철 유색광물의 풍화과정에서 침철석과 적철석이 침전되어 퇴적물이 적갈색을 띠게 되었다. 이 지역의 적갈색 점토-실트는 한반도 타지역 풍성퇴적물과 광물학적 및 지화학적 특성을 공유하므로 풍성퇴적물로 추정되지만, 이에 대해서는 퇴적물 연대측정이나 동위원소 분석 등의 추가 검증이 필요하다.

Keywords

References

  1. Asahara, Y., Tanaka, T., Kamioka, H., Nishimura, A., and Yamazaki, A. (1999) Provenance of the north Pacific sediments and process of source material transport as derived from Rb-Sr isotopic systematics. Chem. Geol., 158, 271-291. https://doi.org/10.1016/S0009-2541(99)00056-X
  2. Biscaye, P.E., Grousset, F.E., Revel, M., Van der Gaast, S., Zielinski, G.A., Vaars, A., and Kukla, G. (1997) Asian provenance of glacial dust (stage 2) in the Greenland Ice Sheet Project 2 Ice Core, Summit, Greenland. J. Geophys. Res., 102, 26,765-26,781. https://doi.org/10.1029/97JC01249
  3. Brindley, G.W. (1980) Order-disorder in clay mineral structures. In: Brindley, G.W., Brown, G. (eds.), Crystal Structures of Clay Minerals and Their X-ray Identification, Monograph 5, Mineralogical Society, London, 125-195.
  4. Jeong, G.Y. (2000) The dependence of localized crystallization of halloysite and kaolinite on primary minerals in the weathering profile of granite. Clays Clay Miner., 48, 196-203. https://doi.org/10.1346/CCMN.2000.0480205
  5. Jeong, G.Y. (2008) Bulk and single-particle mineralogy of Asian dust and a comparison with its source soils. J. Geophys. Res.-Atmos., 113, D02208, doi:10.1029/2007JD008606.
  6. Jeong, G.Y. and Achterberg, E.P. (2014) Chemistry and mineralogy of clay minerals in Asian and Saharan dusts and the implications for iron supply to the oceans. Atmos. Chem. Phys., 14, 12415-12428. https://doi.org/10.5194/acp-14-12415-2014
  7. Jeong, G.Y. and Lee, B.Y. (1998) Weathering of plagioclase in Palgongsan granite. J. Geol. Soc. Korea, 34, 44-57.
  8. Jeong, G.Y., Hillier, S., and Kemp, R.A. (2008) Quantitative bulk and single-particle mineralogy of a thick Chinese loess-paleosol section: implications for loess provenance and weathering. Quat. Sci. Rev., 37, 1271-1287.
  9. Jeong, G.Y., Hillier, S., and Kemp, R.A. (2011) Changes in mineralogy of loess-paleosol sections across the Chinese Loess Plateau. Quat. Res., 75, 245-255. https://doi.org/10.1016/j.yqres.2010.09.001
  10. Jeong, G.Y., Choi, J.-H., Lim, H.S., Seong, C., and Yi, S.B. (2013) Deposition and weathering of Asian dust in Paleolithic sites, Korea. Quat. Sci. Rev., 78, 283-300. https://doi.org/10.1016/j.quascirev.2013.08.002
  11. Jeong, G.Y., Kim, J.Y., Seo, J., Kim, G.M., Jin, H.C., and Chun, Y. (2014) Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysis. Atmos. Chem. Phys., 14, 505-521.
  12. KIGAM (2016) Geological Information System. https://mgeo.kigam.re.kr/map/map.jsp?mode=geology_250k.
  13. Kim, J.C., Lee, Y.I., Lim, H.S., and Yi, S. (2011) Geochemistry of Quaternary sediments of the Jeongokri archaeological site, Korea: implications for provenance and palaeoenvironments during the Late Pleistocene. J. Quat. Sci., 27, 260-268.
  14. Kim, J.Y., Bae, K., Yang, D.Y., Nahm, W.H., Hong, S.S., Ko, S.M., Lee, Y.S., and Kang, M.K. (2002). A preliminary result of soil and sediment analysis in the Pit-E55S20 of Chongok Palaeolithic site, Korea. In: Bae, K. (Ed.), Paleolithic Archaeology in Northeast Asia. Institute of Cultural Properties, Hanyang University, Ansan, Korea, 117-146.
  15. Kim, J.Y., Lee, G.G., Yang, D.Y., Hong, S.S., Nahm,W.H., Lee, and J.Y. (2004) Research on the distribution and formation process of Quaternary deposits of South Korea. J. Korean Palaeolithic Soc. 10, 1-24.
  16. Kim, Y., Bae, J.R., Kim, C.-B., and Roh, Y. (2014) Pedological and Mineralogical Characterizations of Hwangto (Yellow Residual Soils), Naju, Jeollanam-do, Korea. Econ. Environ. Geol., 47, 87-96. https://doi.org/10.9719/EEG.2014.47.2.87
  17. Kukla, G. and Z. An (1989), Loess stratigraphy in central China. Palaeogeogr. Palaeoclimatol. Palaeoecol., 72, 203-225. https://doi.org/10.1016/0031-0182(89)90143-0
  18. Lee, D.Y. (1999) Quaternary Research of Korea. Assembled Papers by Late D.Y. Lee. Hyean, Seoul.
  19. Lee, H.-J., Kim, C.B., Chung, C.-H., Lim, H.S., and Lee, H.Y. (2006) The paleolithic archaeology and Quaternary geology in Youngsan river region. Hakyonmunhwasa, p.320.
  20. Lim, H.S., Lee, Y.I., Yi, S., Kim, C.-B., Chung, C.-H., Lee, H.-J., and Choi, J.-H. (2007) Vertebrate burrows in late Pleistocene paleosols at Korean Palaeolithic sites and their significance as a stratigraphic marker. Quat. Res., 68, 213-219. https://doi.org/10.1016/j.yqres.2007.05.001
  21. Liu, T.S., et al. (1988) Loess in China. China Ocean Press, Springer, Berlin, p.224.
  22. Moore, D.M. and Reynolds Jr., R.C. (1997) X-ray Diffraction and the Identification and Analysis of Clay Minerals. Oxford University Press, New York, 332pp.
  23. Park, M.Y. and Jeong, G.Y. (2016) Mineralogical Properties of Asian Dust Sampled at Deokjeok Island, Incheon, Korea in February 22, 2015. J. Miner. Soc. Korea, 29, 79-87. https://doi.org/10.9727/jmsk.2016.29.2.79
  24. Porter, S.C. (2001) Chinese loess record of monsoon climate during the last glacial-interglacial cycle. Earth-Sci. Rev., 54, 115-128. https://doi.org/10.1016/S0012-8252(01)00043-5
  25. Shin, J.-B., Naruse, T., and Yu, K.-M. (2005) The application of loess-paleosol deposits on the development age of river terraces at the midstream of Hongcheon River. J. Geol. Soc. Korea, 41, 323-333.
  26. Shin, J.-B., Yu, K.-M., Naruse, T., and Hayashida, A. (2004) Study on loess-paleosol stratigraphy of Quaternary unconsolidated sediments at E55S20-IV pit of Chongokni Paleolithic site. J. Geol. Soc. Korea 41, 369-381.
  27. Yi, S. (2000) For chronology and stratigraphy of Korean Paleolithic. J. Korean Archaeol. Soc. 42, 1-22.
  28. Yi, S. (2011) On the age and depositional characteristics of the Jeongok-ri Palaeolithic site. Gogo Hakji 17, 9-21.
  29. Yi, S., Soda, T., and Arai, F. (1998) New discovery of Aira-Tn ash (AT) in Korea. J. Korean Geogr. Soc., 33, 447-454.
  30. Yi, S., Yoo, Y., Yang, S., Kim, D., and Lee, J. (2011) Excavation in the Road Construction Site in Jeongok-ri. Seoul National University Museum, Seoul.
  31. Yoon, S., Park, C.-S., and Hwang, S. (2011) Geochemical properties of loess-paleosol sequence in the Haemi area, Seosan, Chungnam Province, South Korea. J. Geol. Soc. Korea, 47, 343-362.
  32. Yoon, S., Park, C.-S., Hwang, S., and Naruse, T. (2007) Weathering characteristics of loesspaleosol sequence at the Daecheon area, South Korea. J. Geol. Soc. Korea, 43, 281-296.
  33. Yu, K.-M., Shin, J.-B., and Naruse, T. (2008). Loesspaleosol stratigraphy of Dukso area, Namyangju City, Korea (South). Quat. Int., 176-177, 96-103. https://doi.org/10.1016/j.quaint.2007.05.007

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