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Tephra productivity and eruption flux of the subglacial Katla volcano, Iceland

  • Bergrún Arna Óladóttir
  • Olgeir Sigmarsson
  • Guðrún Larsen
Research Article
  • 315 Downloads

Abstract

The influence of the mode of magma ascent on eruption fluxes is uncertain beneath active volcanoes. To study this, the subglacial volcano Katla, Iceland, whichhas produced abundant tephra through the Holocene, has been investigated through volume estimations of the largest eruptions from the last ~ 3500 years. Tephra volume measurements allow tephra productivity and their variation through time to be estimated. By adding the volume of lava from effusive eruptions, the total eruption flux is obtained. Tephra productivity shows variations with time, ranging from 2.0 km3/century, during the prehistoric period examined, to 0.7 km3/century, during historical time (after 939 CE). However, the average eruption flux remained unchanged (~ 2.2 km3/century) during the studied ~ 3500 years due to the large lava produced during the Eldgjá flood basalt eruption (939 CE). Following the Eldgjá event, tephra production declined and also eruption frequency, decreasing from 5.6-2.0 eruptions/century. Magma ascending vertically to the glacier -covered volcano results in explosive phreatomagmatic eruptions and tephra formation, whereas magma transferred in a laterally extended dyke leads to predominant fissural eruptions outside the glacier (e.g., Eldgjá). The mode of magma ascent thus exerts control on the eruption frequency and the volcanic style at Katla volcano without affecting the long-term eruption flux. A uniform increase in cumulative magma volume from Katla suggests a time-integrated steady-state behavior over the last ~ 3500 years. Finally, although the large fissural eruption of Eldgjá lowered the following eruption frequency, it only temporarily affected the time averaged eruption flux of Katla.

Keywords

Tephra productivity Eruption flux Magma storage system Tephra Katla Iceland 

Notes

Acknowledgements

We would like to thank Sigríður Björgvinsdóttir, Dominic Pyanoe, Guðmundur Óli Sigurgeirsson, Ester Anna Ingólfsdóttir, Jónas Guðnason, Esther Ruth Guðmundsdóttir, and Edda Sóley Þorsteinsdóttir for their assistance during fieldwork. We also thank Jean-Luc Devidal for his help with electron microprobe analyses in Clermont-Ferrand, France. Grants from Nordic Volcanological Center and University of Iceland Research Fund made this study possible, together with financial support through the “Volcano Anatomy” project of the Icelandic Science Fund (Rannís). David Pyle and an anonymous reviewer are acknowledged for their detailed and constructive reviews. Efficient editorial handling by the editors was appreciated.

References

  1. Árnadóttir TH, Geirsson H, Jiang W (2008) Crustal deformation in Iceland: plate spreading and earthquake deformation. Jökull 58:59–74Google Scholar
  2. Bacon CR (1982) Time-predictable bimodal volcanism in the Coso Range, California. Geology 10:65–69CrossRefGoogle Scholar
  3. Baillie MGI, McAneny J (2015) Tree ring effects and ice core acidities clarify the volcanic record of the first millennium. Clim Past 11:105–114CrossRefGoogle Scholar
  4. Bottinga Y, Weill DF (1970) Densities of liquid silicate systems calculated from partial molar volumes of oxide components. Am J Sci 269:169–182CrossRefGoogle Scholar
  5. Darbyshire FA, White RS, Priestley KF (2000) Structure of the crust and uppermost mantle of Iceland from a combined seismic and gravity study. Earth Planet Sci Lett 181:409–428CrossRefGoogle Scholar
  6. Eliasson J, Larsen G, Gudmundsson MT, Sigmundsson F (2006) Probabilistic model for eruptions and associated flood events in the Katla caldera, Iceland. Comput Geosci.  https://doi.org/10.1007/s10596-005-9018-y
  7. Fontijn K, Costa F, Newhall C (2015) A 5000-year record of multiple highly explosive mafic eruptions from Gunung Agung (Bali, Indonesia): implications for eruption frequency and volcanic hazards. Bull Volcanol 77:59.  https://doi.org/10.1007/s00445-015-0943-x CrossRefGoogle Scholar
  8. Gudmundsson MT (1994) Bygging Kötlueldstöðvarinnar samkvæmt þyngdarmælingum. Kötlustefna 26.02.1994, ReykjavíkGoogle Scholar
  9. Gudmundsson MT, Högnadóttir Þ (2006) Mýrdalsjökull and eyjafjallajökull bouger gravity data. Science Institute Report RH-16-2006. Institute of Earth Sciences, University of Iceland, ReykjavíkGoogle Scholar
  10. Gudmundsson O, Brandsdóttir B, Menka W, Sigvaldason GE (1994) The crustal magma chamber of the Katla volcano in South Iceland revealed by 2-D seismic undershooting. Geophys J Int 119:277–296CrossRefGoogle Scholar
  11. Harris A, Steffke A, Calvari S, Spampinato L (2011) Thirty years of satellite-derived lava discharge rates at Etna: implications for steady volumetric output. J Geophys Res 116:B08204.  https://doi.org/10.1029/2011JB008237 Google Scholar
  12. Jakobsson SP (1979) Petrology of recent basalts of the eastern volcanic zone, Iceland. Acta Nat Isl 26:1–103Google Scholar
  13. Jeddi Z, Tryggvason A, Gudmundsson Ó (2016) The Katla volcanic system imaged using local earthquakes recorded with a temporary seismic network. J Geophys Res Solid Earth 121:7230–7251.  https://doi.org/10.1002/2016JB013044 CrossRefGoogle Scholar
  14. Jóhannesson H, Jakobsson SP, Sæmundsson K (1990) Geological map of Iceland, sheet 6, South-Iceland, 3rd edn. Icelandic Museum of Natural history and Iceland Geodetic Survey, ReykjavíkGoogle Scholar
  15. Lacasse C, Sigurdsson H, Carey SN, Jóhannesson H, Thomas LE, Rogers NW (2007) Bimodal volcanism at the Katla subglacial caldera, Iceland: insight into the geochemistry and petrogenesis of rhyolitic magmas. Bull Volcanol 69:337–399CrossRefGoogle Scholar
  16. LaFemina PC, Dixon TH, Malservisi R, Arnadottir T, Sturkell E, Sigmundsson F, Einarsson P (2005) Geodetic GPS measurements in South Iceland: strain accumulation and partitioning in a propagating ridge system. J Geophys Res Solid Earth 110(B11):1–21.  https://doi.org/10.1029/2005JB003675 CrossRefGoogle Scholar
  17. Larsen G (1978) Gjóskulög í nágrenni Kötlu (tephra layers in vicinity of Katla). Unpublished BSc Honor’s thesis, University of IcelandGoogle Scholar
  18. Larsen G (2000) Holocene eruptions within the Katla volcanic system, South Iceland: characteristics and environmental impact. Jökull 49:1–28Google Scholar
  19. Larsen G (2010) Katla: tephrochronology and eruption history. Devel Quat Sci 13:23–49Google Scholar
  20. Larsen G, Newton AJ, Dugmore AJ, Vilmundardottir E (2001) Geochemistry, dispersal, volumes and chronology of Holocene silicic tephra layers from the Katla volcanic system, Iceland. J Quat Sci 16:119–132CrossRefGoogle Scholar
  21. Larsen G, Guðmundsson MT, Sigmarsson O (2013) Katla. In: Sólnes J (ed) Náttúruvá á Íslandi. Eldgos og Jarðskjálftar. Viðlagatrygging Íslands/Háskólaútgáfan, Reykjavík, pp 211–234Google Scholar
  22. Mcbirney AR (2007) Igneous petrology, 3rd edition. Appendix B. In: Jones and Bartlett Publishers, Boston, 508 pGoogle Scholar
  23. Meyer PS, Sigurdsson H, Schilling JG (1985) Petrological and geochemical variations along Iceland’s Neovolcanic zones. J Geophys Res 90:10043–10072CrossRefGoogle Scholar
  24. Miyabuchi Y (2009) A 90,000-year tephrostratigraphic framework of Aso volcano, Japan. Sediment Geol 220:169–189CrossRefGoogle Scholar
  25. Óladóttir BA, Larsen G, Thordarson T, Sigmarsson O (2005) The Katla volcano S-Iceland: Holocene tephra stratigraphy and eruption frequency. Jökull 55:53–74Google Scholar
  26. Óladóttir BA, Thordarson T, Larsen G, Sigmarsson O (2007) Survival of the Mýrdalsjökull ice cap through the Holocene thermal maximum? Evidence from sulfur contents in Katla tephra layers (Iceland) from the last ~8400 years. Ann Glaciol 45:183–188CrossRefGoogle Scholar
  27. Óladóttir BA, Sigmarsson O, Larsen G, Thordarson T (2008) Katla volcano, Iceland: magma composition, dynamics and eruption frequency as recorded by Holocene tephra layers. Bull Volcanol 70(4):475–493CrossRefGoogle Scholar
  28. Óladóttir BA, Larsen G, Sigmarsson O (2014) Volume estimates of nine Katla tephra layers (~1860 BC-870 AD). Jökull 64:23–40Google Scholar
  29. Pedersen GBM, Belart JMC, Magnússon E, Vilmundardóttir OK, Kizel F, Sigurmundsson FS, Gísladóttir G, Benediktsson JA (2018) Hekla volcano, Iceland, in the 20th century: lava volumes, production rates, and effusion rates. Geophys Res Lett 45:1805–1813.  https://doi.org/10.1002/2017GL076887 CrossRefGoogle Scholar
  30. Peltier A, Bachelery P, Staudacher T (2009) Magma transport and storage at piton de La Fournaise (La Réunion) between 1972 and 2007: a review of geophysical and geochemical data. J Volcanol Geotherm Res 184:93–108CrossRefGoogle Scholar
  31. Poland MP, A Miklius, EK Montgomery-Brown (2014) Magma supply, storage, and transport at shield-stage Hawaiian volcanoes. In: Poland MP, CM Landowski, TJ Takahashi (Eds) Characteristics of Hawaiian volcanoes. 1801. U.S. Geol. Surv. Prof. Pap: 179–234. DOI:  https://doi.org/10.3133/pp18015
  32. Press WH, Flannery BP, Teukolsky SA, Vetterling WT (1988) Numerical recipes in C. Cambridge University Press, CambridgeGoogle Scholar
  33. Rawson H, Pyle D, Mather TA, Smith VC, Fontijn K, Lachowycz SM, Naranjo JA (2016) The magmatic and eruptive response of arc volcanoes to deglaciation: insights from southern Chile. Geology 44:251–254CrossRefGoogle Scholar
  34. Sæmundsson K (1978) Fissure swarms and central volcanoes of the neovolcanic zones of Iceland. Geol J Spec Issue 10:415–432Google Scholar
  35. Sæmundsson K (1979) Outline of the geology of Iceland. Jökull 29:7–29Google Scholar
  36. Schomacher A, Kruger J, Larsen G (2003) An extensive late Holocene glacier advance of Kötlujökull, central South Iceland. Quat Sci Rev 22:1427–1434CrossRefGoogle Scholar
  37. Siegl M, Winstrup M, McConnell JR, Welten KC, Plunkett G, Ludlow F, Buntgen U, Caffee M, Chellman N, Dahl-Jensen D, Fischer H, Kipfstuhl S, Kostick C, Maselli OJ, Mekhaldi F, Mulvaney R, Muscheler R, PasterisDR PJR, Salzer M, Schupbach S, Steffensen JP, Vinther BM, Woodruff TE (2015) Timing and climate forcing of volcanic eruptions for the past 2,500 years. Nature 523:543–562CrossRefGoogle Scholar
  38. Sleep NH (1990) Hotspots and mantle plumes: some phenomenology. J Geophys Res 95(B5):2156–2202.  https://doi.org/10.1029/JB095iB05p06715 CrossRefGoogle Scholar
  39. Swindles GT, Watson EJ, Savov IP, Lawson IT, Schmidt A, Hooper A, Cooper CL, Connor CB, Gloor M, Carrivick JL (2017) Climatic control on Icelandic volcanic activity during the mid-Holocene. Geology 46(1):47–50CrossRefGoogle Scholar
  40. Thorarinsson S (1967) The eruptions of Hekla in historical times. In: Einarsson T, Kjartansson G, Thorarinsson S (eds) The eruption of Hekla 1947–1948. Soc Sci Islandica, Reykjavík, pp 1–177Google Scholar
  41. Thorarinsson S (1975) Katla og annáll Kötlugosa. Árbók Ferðafélags Íslands 125–149Google Scholar
  42. Thordarson TH, Miller DJ, Larsen G, Self S, Sigurdsson H (2001) New estimates of sulphur degassing and atmospheric mass-loading by the 934 AD Eldgjá eruption, Iceland. J Volcanol Geotherm Res 108:33–54CrossRefGoogle Scholar
  43. Torfason H, Jónsson HB (2005) Jarðfræði við norðvestanverðan Mýrdalsjökul. In: Magnús Guðmundsson MT, Gylfason ÁG (eds) Hættumat vegna eldgosa og hlaupa frá vestanverðum Mýrdalsjökli og Eyjafjallajökli: 45–73. Ríkislögreglustjórinn, Háskólaútgáfan, ReykjavíkGoogle Scholar
  44. Wadge G (1982) Steady state volcanism: evidence from eruption histories of polygenetic volcanoes. J Geophys Res 87(B5):4035–4049CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Nordic Volcanological Center, Institute of Earth SciencesUniversity of IcelandReykjavíkIceland
  2. 2.Laboratoire Magmas et VolcansCNRS and Université Clermont AuvergneAubièreFrance

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