The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Petrology of Puu Oo lavas from the Big Island, Hawaii

하와이, 빅 아일랜드의 푸우오오 용암에 대한 암석학적 연구

  • Kwon, Suk-Bom (Department of geology, kyungpook National University) ;
  • Jang, Yun-Deuk (Department of geology, kyungpook National University) ;
  • Park, Byeong-Jun (Department of geology, kyungpook National University) ;
  • Kim, Yeong-Kyoo (Department of geology, kyungpook National University) ;
  • Kim, Jung-Jin (Department of Geoenvironmental Science, Andong National University)
  • Published : 2007.12.31
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Abstract

The Puu Oo eruption in Hawaii since 1983 is one of the largest eruptions on Hawaii's volcanic history with prominent compositional variation ($5.6{\sim}10.1wt.%$ in MgO content). Although intense researches of Hawaiian eruption have been conducted for recent years, there is no up-to-date study on Puu Oo lavas that is erupting hot lavas today. in oder to obtain basic information on the geological characteristics of the eruption including any noticeable change in its petrological trend and magma dynamics, we applied several geological approaches such as field survey, systematic sampling, petrography, mineralogy, and geochemistry. Clinopyroxene and Plagioclase phenocrysts are rarely observed on the thin section, however Olivine crysts are much more obvious in the study area. It indicates that Puu Oo is early stage of magma differentiation. Variation diagram of whole rock composition shows that the elements such as $TiO_2,\;Al_2O_3,\;SiO_2$ and $Na_2O$ decrease with increasing MgO. In the trace element Sr, Y Zr and V versus $K_2O$, P18, P19 samples are plotted in primitive area. Variations of the Ni contents during $2003{\sim}2006$ may suggest a sudden change in magma composition probably caused by new magma injection.

푸우오오 용암분출은 1983년에 분출이 시작된 이래 현재까지 활동하고 있으며, 다양한 성분 변화와 ($5.6{\sim}10.1wt.%$ MgO), 지표분출 면적을 가지는(${\sim}2km^3$) 하와이의 역사적인 분출 중에 하나이다(Garcia et al., 1999). 다년간에 걸쳐 하와이 분출에 대한 연구가 수행되어 왔으나, 최근 수년 이내에 분출된 푸우오오 용암의 지질학적인 특성에 대한 연구 결과의 부재와 푸우오오 분출 역사를 통한 하와이 마그마 분출과정의 특성을 파악하고자 시공간적으로 채취한 시료를 바탕으로 광물과 암석의 조직과 화학조성연구를 수행하였다. 박편 상에서 단사휘석이나 사장석 반정은 드물고 감람석이 대부분의 반정을 차지한다. 이것은 푸우오오 지역이 마그마 분화 초기단계에 머물러 있다는 것을 지시한다. MgO를 상대로 주원소에 대해 도시해 본 결과 MgO가 증가함에 따라 $TiO_2,\;Al_2O_3,\;Na_2O,\;SiO_2$는 감소하는 경향을 보인다. 미량원소의 경우 $K_2O$값에 대한 Zr, Y, Sr 그리고 V 도표에서 P18과 P19시료가 타 용암에 비해 진화가 더 진행된 영역에 도시되고 있다. 2003 년에서 2006년 분출년도 간에 높은 Ni 함량이 나타나는데, 이것은 동일 기원마그마의 유입에 의한 결과이다.

Keywords

References

  1. Delaney P.T., Okamura A.T., Miklius A., Sako M., 1990, Present day deformation rates at Kilauea volcano, Hawaii. EOS., 71, 1711 p
  2. Dzurisin, D., Robert Y., Koyanagi and Thomas T., 1984, Magma supply and storage at Kilauea volcano, Hawaii. Bull. Volcanol., 177-206
  3. Fordor, R.V., Frey, F.A., Bauer, G.R. and Clague, D.A., 1992, Age, rare-earth element enrichment and alkalibasalts from Kahoolawe island, Hawaii. Contrib. Mineral. Petrol., 110, 442-462 https://doi.org/10.1007/BF00344080
  4. Garcia, M.O., Rhodes, J.M., Wolfe, E.W., Ulrich, G.E. and Ho, R.A., 1992, Petrology of lavas from episodes 2-47 of the Puu Oo eruption of Kilauea Volcano, Hawaii: evolution of magmatic processes. Bull. Volcanol., 55, 1-16
  5. Garcia, M.O., Rhodes, J.M., Trusdell, F.A. and Pietruszka, A.J., 1996, Petrology of lavas from the Puu Oo erution of Kilauea Volcano : ${\bullet}{\eth}$. The Kupaianaha episode (1986-1992). Bull. Volcanol., 58, 359-357 https://doi.org/10.1007/s004450050145
  6. Garcia, M.O., Pietruszka, A.J., Rhodes, J.M. and Kierstin swanson, 1999, Magmatic Processes During the Prolonged Pu'u 'O'o Eruption of Kilauea Volcano, Hawaii. J. Petrol., 41, 7, 967-990 https://doi.org/10.1093/petrology/41.7.967
  7. Hawkins, J. and Melchior J., 1983, Petrology of basalts from Loihi seamount, Hawaii. Earth Planet. Sci. Lett., 356-368
  8. Klein, F.W., Koyanagi, R.Y., Nakata, J.S. and Tanigawa, W.R., 1987, The seismicity of Kilauea's magma system. US Geol. Surv. Prof. Pap., 1350, 1019-1185
  9. Macdonald, G.A. and Katsura, T., 1964, Chemical Composition of Hawaiian Lavas. J. Petrol., 5: 82-133 https://doi.org/10.1093/petrology/5.1.82
  10. Macdonough, W.F. and Sun, S., 1988, A primitive mantle composition from xenoliths. Chem. Geol., 12
  11. Neal, C.A. and Lockwood, J.P., 2006, Geologic map of the summit region of Kilauea Volcano, Hawaii. usgs
  12. Pearce, J.A., 1983, Role of the sub-continental lithosphere in magma genesis at active continental margins. in:Hawkesworth C.J. and Norry M.J., Continental basalts and mantle xenoliths. Shiva, Nantwich, 230-249
  13. Peterson, D.W. and Moore R.B., 1987, Geologic history and evolution of geologic concepts, Island of Hawaii. In : Decker R.W., and Wright T.L., and Staufffer P.H.(eds.), Volcanism in Hawaii. US Geol. Surv. Prof. Pap., 1350, Vol. 1, 149-189
  14. Ryan M.P., 1988, The mechanics and three-dimensional internal structure of active magmatic systems, Kilauea Volcano, Hawaii. J. Geophys. Res., 93, 4213-4248 https://doi.org/10.1029/JB093iB05p04213
  15. Rollinson, H.R., 1993, Using Geochemical Data: Evaluation, Presentation, Interpretation. Longman Scientific and Technical, 102, 147 p
  16. Rollinson, H.R. and Lowry, D., 1993, Early basic magmatism in the evolution of the northern marginal zone of the archean limpopo belt. Precambrian Research, 33-45
  17. Sun, S.S., 1980, Lead isotopic study of young volcanic rocks from mid-ocean ridges, ocean islands and island arcs. Phil. Trans. R. Soc., A297, 409-445
  18. Wolfe E.W., Garcia M.O., Jackson D.B., Koyanagi R.Y., Neal C.A. and Okamura A.T., 1987, The Puu Oo eruption of Kilarea Volcano, episode 1 through 20, January 3, 1983, to June 8, 1984. US Geol. Surv. Prof. Pap., 1350, 471-508