Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Eruption Types and Textures of Pyroclastics from the Jugam Scoria Deposits, Ulleung Island, Korea

울릉도 죽암분석층에서 나온 화성쇄설물들의 조직과 분화유형

  • Hwang, Sang Koo (Department of Earth and Environmental Sciences, Andong National University) ;
  • Ahn, Ung San (World Heritage Office, Jeju Special Self-govering Province) ;
  • Lee, So Jin (Institute of Basic Sciences, Andong National University) ;
  • Oh, Kyung Sik (Division of New Material Engineering, Andong National University)
  • 황상구 (안동대학교 자연과학대학 지구환경과학과) ;
  • 안웅산 (제주특별자치도 세계유산본부) ;
  • 이소진 (안동대학교 기초과학연구소) ;
  • 오경식 (안동대학교 공과대학 신소재학부)
  • Received : 2019.09.24
  • Accepted : 2019.10.24
  • Published : 2019.10.28
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Abstract

We present a quantitative evaluation of density, vesicularity and microtextures for coarse lapilli collected from the Jugam Scoria Deposits, northeastern Ulleung Island. Lapilli from the deposits have modal vesicularities of 61% in the lower part and 67% in the upper part, and vesicle populations dominated by non-interconnected subround vesicles. Clasts of modal vesicularity have margin-parallel zonation, with subaerially quenched rims interpreted to preserve "syn-fragmentation" magmatic textures in microlite-free sideromelane rims, grading "post-fragmentation" tachylitic interiors with vesicle and microlite textures that progressively coarsen from rim to interior. Degassing scenarios are linked to syn-fragmentation vesicle textures to demonstrate that the magmas degassed in dominantly closed systems. And diffusion-controlled cooling rates of trachyandesitic pyroclasts in contact with atmosphere are linked to post-fragmentation evolution of vesicle and microlite textures to infer about transportation and dispersal of the pyroclasts in low shooting jets. These textural analyses show that the Jugam eruptions were strictly applied to the strombolian type, analogous to the hawaiian type among any classical subaerial eruption type.

울릉도 북동부 죽암분석층에서 나온 조립 라필리의 밀도, 기공률과 미조직에 대한 정량적 및 정성적 평가를 하였다. 이들 라필리는 하부에서 61%와 상부에서 67%의 최빈기공률, 그리고 연결되지 않은 아원상 기공이 우세한 기공집단을 가진다. 최빈기공률의 쇄설물은 외연부에 평행한 누대를 가지는데, 이 외연부는 대기저에서 급랭된 것이며 미정 없는 적철유리대로서 "파쇄동시"의 마그마성 조직을 보존한 것으로 해석된다. 한편 이 적철유리 외연부는 내부로 가면서 점차 조립화되는 미정 및 기공 조직을 갖는 "파쇄후"의 흑철유리 내부로 점이된다. 그리고 탈기작용 시나리오는 마그마가 주로 닫힌계에서 탈기되었음을 증명해주는 파쇄동시 기공조직과 연결된다. 한편 대기와 접촉하는 조면안산암질 화성쇄설물의 확산적 냉각속도는 치솟는 분사에서 화성쇄설물의 운반과 분산에 관해 추론할 수 있는 파쇄후 기공 및 미정 조직과 연결된다. 이러한 조직 분석은 죽암 분화가 일반적인 대기저 분화유형 중에서 부분적으로 하와이식 분천을 닮은 스트롬볼리식 분화이었다는 것을 보여준다.

Keywords

References

  1. Brenna, M., Price, R., Cronin, S.J., Smith, I.E.M., Sohn, Y.K., Kim, G.B. and Maas, R. (2014) Final magma storage depth modulation of explosivity and trachyte/phonolite genesis at an intraplate volcano: a case study from Ulleung Island, Republic of Korea. J. Ptrol. Doi: 10.1093/petrology/egu004
  2. Cashman, K.V. and Mangan, M.T. (1994) Physical aspects of magmatic degassing. II. Constraints on vesiculation processes from textural studies of eruptive products. In: Carroll, M.R., Holloway, J.R. (Eds.), Volatiles in Magmas. Rev. Mineral, v.30, p.447-478.
  3. Couch, S., Sparks, R.J.S. and Carroll, M.R. (2003) The kinetics of degassing-induced crystallization at Soufriere Hills volcano, Montserrat. J. Petrol., v.44, p.1477-1502. https://doi.org/10.1093/petrology/44.8.1477
  4. Fisher, R.V. and Schmincke, H.-U. (1984) Pyroclastic Rocks. Springer-Verlag, Berlin. 472 p.
  5. Hammer, J.E. (2006) Influence of $fO_2$ and cooling rate on the kinetics and energetics of Fe-rich basalt crystallization. Earth Planet. Sci. Lett., v.248, p.618-637. https://doi.org/10.1016/j.epsl.2006.04.022
  6. Hammer, J.E. and Rutherford, M.J. (2002) An experimental study of the kinetics of decompression-induced crystallization in silicic melt. J. Geophys. Res., v.107, B12021
  7. Head, J. and Wilson, L. (1989) Basaltic pyroclastic eruptions: influence of gas-release patterns and volume fluxes on fountain structure, and the formation of cinder cones, spatter cones, rootless flows, lava ponds and lava flows. J. Volcanol. Geotherm. Res., v.37, p.261-271. https://doi.org/10.1016/0377-0273(89)90083-8
  8. Herd, R.A. and Pinkerton, H. (1997) Bubble coalescence in basaltic lava: it's impact on the evolution of bubble populations. J. Volcanol. Geotherm. Res., v.75, p.137-157. https://doi.org/10.1016/S0377-0273(96)00039-X
  9. Heiken, G. (1978) Characteristics of tephra form cinder cone, Lassen Volcanic National Park, California. Bull. Volcanol., v.41, p.119-130 https://doi.org/10.1007/BF02597025
  10. Houghton, B.F, and Hackett, W,R, (1984) Strombolian and phreatomagmatic deposits of Oakune Craters, Ruapehu, New Zealand: a complex interaction between external water and rising basaltic magma. J. Volcanol. Geotherm. Res., v.21, p.207-231. https://doi.org/10.1016/0377-0273(84)90023-4
  11. Houghton, B.F. and Schmincke, H.U. (1989) Rothernberg scoria cone, East Eifel: a complex Strombolian and phreatomagmatic volcano. Bull. Volcanol., v.52, p.28-48. https://doi.org/10.1007/BF00641385
  12. Hwang, S.K., Hwang, J.H. and Kwon, C.W. (2012) Geological report of the Ulleungdo Sheet. Korea Institute of Geoscience and Mineral Resources, 83p.
  13. Johnson, E.R., Wallace, P.J., Cashman, K.V., Delgado, G.H. and Kent, A. (2008) Magmatic volatile contents and degassing-induced crystallization at Volcan Jorullo, Mexico: implications for melt evolution and the plumbing systems at monogenetic volcanoes. Earth Planet. Sci. Lett., v.269, p.478-487. https://doi.org/10.1016/j.epsl.2008.03.004
  14. Keating, G.N., Valentine, G.A., Krier, D.J. and Perry, F.V. (2008) Shallow plumbing systems for small-volume basaltic volcanoes. Bull. Volcanol., v.70, p.563-582. https://doi.org/10.1007/s00445-007-0154-1
  15. Lautze, N.C. and Houghton, B.F. (2005) Physical mingling of magma and complex eruption dynamics in the shallow conduit at Stromboli volcano, Italy. Geology, v.33, p.425-428. https://doi.org/10.1130/G21325.1
  16. Lautze, N.C. and Houghton, B.F. (2007) Linking variable explosion style and magma textures during 2002 at Stromboli volcano, Italy. Bull. Volcanol., v.69, p.445-460. https://doi.org/10.1007/s00445-006-0086-1
  17. Lofgren, G. (1974) An experimental study of plagioclase crystal morphology: isothermal crystallization. Am. J. Sci., v.274, p.243-273. https://doi.org/10.2475/ajs.274.3.243
  18. McGetchin, T.M., Settle, M. and Chouet, B.A. (1974) Cinder cone growth modeled after Northeast Crater, Mount Etna, Sicily. J. Geophys. Res., v.79, p.3257-3272. https://doi.org/10.1029/JB079i023p03257
  19. Muncill, G.E. and Lasaga, A.C. (1987) Crystal-growth kinetics of plagioclase in igneous systems: one-atmosphere experiments and application of a simplified growth model. Am. Mineral, v.72, p.299-311.
  20. Namiki, A. and Manga, M. (2008) Transition between fragmentation and permeable outgassing of low viscosity magmas. J. Volcanol. Geotherm. Res., v.169, p.48-60. https://doi.org/10.1016/j.jvolgeores.2007.07.020
  21. Parfitt, E.A. (2004) A discussion of the mechanisms of explosive basaltic eruptions. J. Volcanol. Geotherm. Res., v.134, p.77-107. https://doi.org/10.1016/j.jvolgeores.2004.01.002
  22. Pioli, L., Erlunda, E., Johnson, E.R., Cashman, K.V., Wallace, P.J., Rosi, M. and Delgado, H. (2008) Explosive dynamics of violent Strombolian eruptions: the eruption of Paricutin Volcano 1943-1952 (Mexico). Earth Planet. Sci. Lett., v.271, p.359-368. https://doi.org/10.1016/j.epsl.2008.04.026
  23. Polacci, M., Corsaro Rosa, A. and Andronico, D. (2006) Coupled textural and compositional characterization of basaltic scoria; insights into the transition from Strombolian to fire fountain activity at Mount Etna, Italy. Geology, v.34, p.201-204. https://doi.org/10.1130/G22318.1
  24. Polacci, M., Baker, D.R., Bai, L. and Mancini, L. (2008) Large vesicles record pathways of degassing at basaltic volcanoes. Bull. Volcanol., v.70, p.1023-1029. https://doi.org/10.1007/s00445-007-0184-8
  25. Sable, J.E., Houghton, B.F., Del Carlo, P. and Coltelli, M. (2006) Changing conditions of magma ascent and fragmentation during the Etna 122 BC basaltic Plinian eruption: evidence from clast microtextures. J. Volcanol. Geotherm. Res., v.158, p.333-354. https://doi.org/10.1016/j.jvolgeores.2006.07.006
  26. Szramek, L., Gardner, J.E. and Larsen, J. (2006) Degassing and microlite crystallization of basaltic andesite magma erupting at Arenal Volcano, Costa Rica. J. Volcanol. Geotherm. Res., v.157, p.182-201. https://doi.org/10.1016/j.jvolgeores.2006.03.039
  27. Taddeucci, J., Pompilio, M. and Scarlato, P. (2004) Conduit processes during the July-August 2001 explosive activity of Mt. Etna (Italy); inferences from glass chemistry and crystal size distribution of ash particles. J. Volcanol. Geotherm. Res., v.137, p.33-54. https://doi.org/10.1016/j.jvolgeores.2004.05.011
  28. Valentine, G.A. and Gregg, T.K.P. (2008) Continental basaltic volcanoes-processes and problems. J. Volcanol. Geotherm. Res., v.177, p.857-873. https://doi.org/10.1016/j.jvolgeores.2008.01.050
  29. Valentine, G.A. and Krogh, K.E.C. (2006) Emplacement of small dikes and sills beneath a small basaltic volcanic center-the role of pre-existing structure (Paiute Ridge, southern Nevada, USA). Earth. Planet. Sci. Lett., v.246, p.217-230. https://doi.org/10.1016/j.epsl.2006.04.031
  30. Valentine, G.A., Krier, D., Perry, F.V. and Heiken, G. (2005) Scoria cone construction mechanisms, Lathrop Wells volcano, southern Nevada, USA. Geology, v.33, p.629-632. https://doi.org/10.1130/G21459AR.1
  31. Valentine, G.A., Krier, D.J., Perry, F.V. and Heiken, G. (2007) Eruptive and geomorphic processes at the Lathrop Wells scoria cone volcano. J. Volcanol. Geotherm. Res., v.161, p.57-80. https://doi.org/10.1016/j.jvolgeores.2006.11.003
  32. Vergniolle, S. and Jaupart, C. (1986) Separated two-phase flow and basaltic eruptions. J. Geophys. Res., v.91, p.12842-12860. https://doi.org/10.1029/JB091iB12p12842
  33. Walker, G.P.L., 1973. Explosive volcanic eruptions: a new classification scheme. Geol. Rundsch., v.62, p.431-446. https://doi.org/10.1007/BF01840108
  34. Walker, D., Kirkpatrick, R.J., Longhi, J. and Hays, J.F. (1976) Crystallization history of lunar picritic basalt sample 12002: phase-equilibria and cooling-rate studies. Geol. Soc. Am. Bull., v.87, p.646-656. https://doi.org/10.1130/0016-7606(1976)87<646:CHOLPB>2.0.CO;2
  35. Wilson, L. and Head, J.W. (1981) Ascent and emplacement of basaltic magma on the Earth and Moon. J. Geophys. Res., v.86, p.2971-3001. https://doi.org/10.1029/JB086iB04p02971
  36. Xu, Z. and Zhang, Y. (2002) Quench rates in air, water, and liquid nitrogen, and inference of temperature in volcanic eruption columns. Earth Planet. Sci. Lett., v.200, p.315-330. https://doi.org/10.1016/S0012-821X(02)00656-8