Three-dimensional lithofacies variations in hyaloclastite deposits

T. J. Watton*, D. A. Jerram, T. Thordarson, R. J. Davies

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Analysis of the spatial lithofacies variability within lava-fed delta formations in southern Iceland has revealed complex three-dimensional volcanic architectures in hyaloclastite deposits in non-glacial settings. Two depositional environments are studied, (a) lava entering a marine embayment (Stóri-Nupur) and; (b) lava advancing into a body of water of the flanks of a Surtseyan cone (Hjörleifshöf{eth}i). Interaction between environmental factors such as shoreline geomorphology, water depth, wave energy levels, the nature of the lava transport system, lava supply rate all affect the resulting lava deltas creating complex lithofacies arrangements and stacking patterns. Recognised here are two types of hyaloclastite deltas. One of syn-sedimentary origin (Hjörleifshöf{eth}i) and one derived from primary fragmentation processes (Stóri-Nupur). Syn-sedimentary systems are dominated by destabilisation of the hyaloclastite pile leading to reworking downslope and share similarities to alluvial delta systems. Conversely, primary fragmented systems are controlled by waxing and waning cycles in volcanic effusivity whereby the hyaloclastite unit recorded is not the product of one lava flow rather than one eruptive event.

Original languageEnglish
Pages (from-to)19-33
Number of pages15
JournalJournal of Volcanology and Geothermal Research
Volume250
DOIs
Publication statusPublished - 5 Jan 2013

Bibliographical note

Funding Information:
This research was funded by DONG E and P, UK Ltd. Steve Cannon and Mike Smith (DONG Energy E and P) are thanked for much discussion and help. Informative comments and suggestions were made by John Stevenson, Karoly Nemeth and Sverre Planke on earlier versions of this contribution. TJW thanks Clayton Grove, Catherine Nelson, and Kirstie Wright for assistance in the field. Clayton Grove, Nick Schofield and Richard Brown are thanked for useful discussions. Margret Mangan is thanked for additional detailed comments and editorial guidance.

Other keywords

  • Basalt
  • Eruptions
  • Hyaloclastite
  • Iceland
  • Lava

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