The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
권호 표지
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Physical Properties of Pumice from Mt. Baekdu Volcano

백두산 부석의 물리적 특성

  • Yun, Sung-Hyo (Department of Earth Science Education, Pusan National University)
  • 윤성효 (부산대학교 지구과학교육과)
  • Received : 2015.12.03
  • Accepted : 2015.12.23
  • Published : 2015.12.30
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Abstract

Pumices from the summit area of the Mt. Baekdu was analysed with respect to the physical characteristics. Fallout pumice deposits around the somma of the Cheonji caldera, Mt. Baekdu consist mainly of white pumices, but black pumices and gray pumices are also displayed together. White pumices are mainly rhyolitic($SiO_2$ 71.1%) and black pumices are trachytic($SiO_2$ 64.8%) in composition, and gray pumices are intermediate composition($SiO_2$ 68.0%) between white pumices and black pumices. Average density of felsic magma formed the Mt. Baekdu pumices is $2.45g/cm^3$ in anhydrous magma and $2.33g/cm^3$ in hydrous magma, respectively. We determined the density and calculated the vesicularity of three different coloured pumices, which collected in the vicinity of the Waho-bong(2,566 m) and Gwanmyeonbong(2,526 m) of southern somma of the Cheonji caldera, Mt. Baekdu. Average density of the yellow pumices was measured as $0.74g/cm^3$, black pumices as $0.75g/cm^3$, and gray t0 white pumices as $0.73g/cm^3$. Average density regardless of the colour of pumices was nearly constant at $0.75g/cm^3$. Vesicularity of pumices is calculated to be 67.8~69.4% and these pumices can be classified as a highly vesicular according to classification of vesiculation characteristics.

백두산 산정부의 강하부석층의 부석에 대한 물리적 특성을 분석하였다. 백두산 천지 칼데라 외륜산 주변의 강하부석층은 주로 흰색 부석으로 구성되지만 이들 중에는 흑색, 회색의 부석이 함께 산출된다. 흰색 부석은 주로 유문암질($SiO_2$ 71.1% 내외)이며, 흑색 부석은 조면암질($SiO_2$ 64.8% 내외), 회색 부석은 이들의 중간 성분에 해당하는 조면암질로 $SiO_2$ 68.0% 내외이다. 이들 부석을 형성한 마그마의 평균밀도는 무수 마그마의 경우 $2.45g/cm^3$, 함수 마그마의 경우 $2.33g/cm^3$로 계산되었다. 백두산 천지 칼데라 남단 와호봉(2,566 m)과 관면봉(2,526 m) 부근에서 채취한 암색을 달리하는 3 종류의 부석에 대하여 물리적 성질 중 밀도와 발포도를 측정하였다. 황색 부석은 평균 밀도가 $0.74g/cm^3$, 흑색 부석은 $0.75g/cm^3$, 회색~백색 부석은 $0.73g/cm^3$로 측정되었으며, 부석의 색깔에 무관하게 부석의 밀도는 평균 $0.75g/cm^3$로 거의 일정하였다. 부석의 발포도는 67.8~69.4%로 계산되어 높은 정도의 발포도를 가진 부석으로 분류될 수 있다.

Keywords

References

  1. Bottinga, Y. and Weill, D.F., 1970, Densities of liquid silicate systems calculated from partial molar volumes of oxide components. American Journal of Science, 269, 169-182. https://doi.org/10.2475/ajs.269.2.169
  2. Cox, K.G., Bell, J.D., and Pankhurst, R.J., 1979, The Interpretation of Igneous Rocks. George Allen & Unwin, London, 450p.
  3. Dunlap, C.E., Gill, J.B., and Palacz, Z.A., 1992, U/Th disequilibria in the large-volume chemically-zoned eruption of Baitoushan, 1010 AD. EOS. Transactions of the American Geophysical Union 73, 611.
  4. Gudmundsson, A., 2014, Volcano-tectonic modelling of magma chambers, ring-faults, unrest, and eruptions in the Tianchi Volcano, China. Proposed studentship(Project description), Royal Holloway University of London.( https://www.royalholloway.ac.uk/earthsciences/documents/pdf/resops/2014/agchinavolcano.pdf)
  5. Guo, Z., Liu, J., Sui, S., Liu, Q., He, H., and Ni, Y., 2002, The mass estimation of volatile emission during 1199-1200AD eruption of Baitoushan Volcano and its significance, Science in China Series D: Earth Sciences, 45, 530-539. https://doi.org/10.1360/02yd9055
  6. Horn, S. and Schmincke, H.U., 2000, Volatile emission during the eruption of Baitoushan volcano (China/North Korea) ca. 969 AD. Bulletin of Volcanology, 61, 537-555. https://doi.org/10.1007/s004450050004
  7. Houghton, B.F. and Wilson, C.J.N., 1989, A vesicularity index for pyroclastic deposit. Bulletin of Volcanology, 51, 451-462. https://doi.org/10.1007/BF01078811
  8. Liu, R,X., Wei, H.Q., Tang, J., Song, S.R., Li, X.D., Yang, Q.F., Liu, T.S., and Wang, J.J., 1996, Progress of the study on Tianchi Volcano, Changbaishan, China. Seismological and Geomagnetic Observation and Research, 17, 2-11.
  9. Liu, R.X., Wei, H.Q., and Li, J.T., 1998, The Latest Eruptions from the Tianchi Volcano, Changbaishan. Science Press, Beijing, p.159 (in Chinese with English Abstract).
  10. Machida, H. and Arai, F., 1983, Extensive ash falls in and around the Sea of Japan from large late Quaternary eruptions. Journal of Volcanology and Geothermal Research, 18, 151-164. https://doi.org/10.1016/0377-0273(83)90007-0
  11. Machida, H. and Arai, F., 1992, Atlas of tephra in and around Japan. University of Tokyo Press, Tokyo. 276p. (in Japanese)
  12. Miyamoto, T., Nakagawa, M., Tanaka, Y., and Yoshida, M., 2004, Eruptive sequence of the 10th century Baitoushan eruption. In: Tanuguchi, H. (Eds.), 10th great eruption of Baitoushan volcano, northeast China, and its historic effect. CNEAS Monograph Series No.16, 15-43, 218p.
  13. Nanayama, F., Satake, K., Furukawa, R., Shimokawa, K., Atwater, B.F., Shigeno, K., and Yamaki, S., 2003, Unusually large earthquakes inferred from tsunami deposits along the Kuril trench. Nature, 424, 660-663. https://doi.org/10.1038/nature01864
  14. Oppenheimer, C., 2011, Eruptions that shook the World, Cambridge University Press, Cambridge, U.K., doi:10.1017/CBO9780511978012.
  15. Shaw, H.R., 1965, Comments on viscosity, crystal settling and convection in granitic magmas. American Journal of Science, 263, 120-153. https://doi.org/10.2475/ajs.263.2.120
  16. Shaw, H.R., 1972, Viscosities of magmatic silicate liquids: An empirical method of prediction. American Journal of Science, 272, 870-893. https://doi.org/10.2475/ajs.272.9.870
  17. Shea, T., Houghton, B.F., Gurioli, L., Cashman, K.V., Hammer, J.E., and Hobden, B.J., 2010, Textural studies of vesicles in volcanic rocks: an integrated methodology. Journal of Volcanology and Geothermal Research, 190, 271-289. https://doi.org/10.1016/j.jvolgeores.2009.12.003
  18. Sun, C., Plunkett, G., Liu, J., Zhao, H., Sigl, M., McConnell, J.R., and Hall, V., 2014, Ash from Changbaishan Millennium eruption recorded in Greenland ice: Implications for determining the eruption's timing and impact. Geophysical Research Letters, 41(2), 694-701. https://doi.org/10.1002/2013GL058642
  19. Thomas, N., Jaupart, C., and Vergniolle S., 1994, On the vesicularity of pumice. Journal of Geophysical Research, 99(B8), 15633-15644. https://doi.org/10.1029/94JB00650
  20. Wei, H., Sparks, R.S.J., Liu, R., Fan, Q., Wang, Y., Hong, H., Zhang, H., Chen, H., Jiang, C., Dong, J., Zheng, Y., and Pan, Y., 2003, Three active volcanoes in China and their hazards. Journal of Asian Earth Sciences, 21, 515-526. https://doi.org/10.1016/S1367-9120(02)00081-0
  21. Wei, H., Liu, G., and Gill, J., 2013, Review of eruptive activity at Tianchi volcano, Changbaishan, northeast China: implications for possible future eruptions. Bulletin of Volcanology, 75, 1-14.
  22. Xu, J.D., Pan, B., Liu, T.Z., Hajdas, I., Zhao, B., Yu, H.M., Liu, R.X., and Zhao, P., 2013, Climatic impact of the millennium eruption of Changbaishan volcano in China: new insights from high-precision radiocarbon wigglematch dating. Geophysical Research Letters, 40, 54-59. https://doi.org/10.1029/2012GL054246
  23. Yun, S.H., 2013, Volcanological interpretation of historic eruptions of Mt. Baekdusan volcano. Journal of Korean Earth Science Society, 34, 456-469. https://doi.org/10.5467/JKESS.2013.34.6.456
  24. Yun, S.H. and Lee, J.H., 2012, Analysis of unrest signs of activity at the Baegdusan volcano. Journal of Petrological Society of Korea, 21, 1-12 (in Korean with English abstract). https://doi.org/10.7854/JPSK.2012.21.1.001
  25. Yun, S.H., Lee, J.H., Kim, S.K., Chang, C.W., Cho, E., Yang, I.S., Kim, Y.J., Kim, S.H., Lee, K.H., Kim, S.W., and Macedonio, G., 2013, TITAN2D simulations of pyroclastic flows from small scale eruption at Mt. Baekdusan. Journal of Korean Earth Science Society, 34, 615-625 (in Korean with English abstract). https://doi.org/10.5467/JKESS.2013.34.7.615
  26. Yun, S.H., Lee, J.H., Kim, S.K., Cho, E., Chang, C.W., and Yang, I.S., 2014, Major element characteristics of Millennium eruption pumices at Mt. Baekdu volcano. Proceedings of the Annual Joint Conference, the Petrological Society of Korea and the Mineralogical Society of Korea(May 29-30, 2014, Busan, Korea), 4.
  27. Zielinski, G.A., Mayewski, P.A., Meeker, L.D., Whitlow, S., Twickler, M.S., Morrison, M., Meese, D.A., Gow, A.J., and Alley, R.B., 1994, Record of volcanism since 7000 B.C. from the GISP2 Greenland ice core and implications for the volcano-climate system. Science, 264, 948-952. https://doi.org/10.1126/science.264.5161.948