Anatomy of a submarine pyroclastic flow and associated turbidity current : July 2003 dome collapse, Soufrière Hills volcano, Montserrat, West Indies

Trofimovs, Jessica, Sparks, R. Stephen John, & Talling, Peter J. (2008) Anatomy of a submarine pyroclastic flow and associated turbidity current : July 2003 dome collapse, Soufrière Hills volcano, Montserrat, West Indies. Sedimentology, 55(3), pp. 617-634.

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The 12 to 13 July 2003 andesite lava dome collapse at the Soufrière Hills volcano, Montserrat, provides the first opportunity to document comprehensively both the sub-aerial and submarine sequence of events for an eruption. Numerous pyroclastic flows entered the ocean during the collapse, depositing approximately 90% of the total material into the submarine environment. During peak collapse conditions, as the main flow penetrated the air–ocean interface, phreatic explosions were observed and a surge cloud decoupled from the main flow body to travel 2 to 3 km over the ocean surface before settling. The bulk of the flow was submerged and rapidly mixed with sea water forming a water-saturated mass flow. Efficient sorting and physical differentiation occurred within the flow before initial deposition at 500 m water depth. The coarsest components (∼60% of the total volume) were deposited proximally from a dense granular flow, while the finer components (∼40%) were efficiently elutriated into the overlying part of the flow, which evolved into a far-reaching turbidity current.

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ID Code: 52956
Item Type: Journal Article
Refereed: Yes
Keywords: Granular flow , Montserrat, Soufrie`re Hills volcano, Submarine Pyroclastic Flow, Turbidity Current
DOI: 10.1111/j.1365-3091.2007.00914.x
ISSN: 1365-3091
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000)
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2007 The Authors. Journal compilation Copyright 2007 International Association of Sedimentologists
Deposited On: 06 Aug 2012 22:27
Last Modified: 21 Oct 2012 16:34

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