skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Submarine deposits from pumiceous pyroclastic density currents traveling over water: An outstanding example from offshore Montserrat (IODP 340)

Journal Article · · Geological Society of America, Bulletin
DOI:https://doi.org/10.1130/B31448.1· OSTI ID:1480776
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. National Oceanography Centre, Southampton (United Kingdom); Univ. of Otago, Dunedin (New Zealand). Dept. of Geology; Univ. of Tasmania, Hobart, TAS (Australia). School of Physical Sciences and Centre of Excellence in Ore Deposits (CODES)
  2. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science
  3. Univ. of Otago, Dunedin (New Zealand). Dept. of Geology
  4. National Oceanography Centre, Southampton (United Kingdom)
  5. Univ. of New Hampshire, Durham, NH (United States). Climate Change Research Center
  6. Univ. of Birmingham (United Kingdom). School of Geography, Earth and Environmental Sciences
  7. Johannes Gutenberg Univ., Mainz (Germany). Inst. of Geosciences
  8. Univ. of Southampton (United Kingdom). School of Ocean and Earth Science
  9. Univ. Paris Diderot, Paris (France). Inst. de Physique du Globe de Paris
  10. National Inst. of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan). Geological Survey of Japan

Pyroclastic density currents have been observed to both enter the sea, and to travel over water for tens of kilometers. Here, we identified a 1.2-m-thick, stratified pumice lapilli-ash cored at Site U1396 offshore Montserrat (Integrated Ocean Drilling Program [IODP] Expedition 340) as being the first deposit to provide evidence that it was formed by submarine deposition from pumice-rich pyroclastic density currents that traveled above the water surface. The age of the submarine deposit is ca. 4 Ma, and its magma source is similar to those for much younger Soufrière Hills deposits, indicating that the island experienced large-magnitude, sub-aerial caldera-forming explosive eruptions much earlier than recorded in land deposits. The deposit's combined sedimentological characteristics are incompatible with deposition from a submarine eruption, pyroclastic fall over water, or a submarine seafloor-hugging turbidity current derived from a subaerial pyroclastic density current that entered water at the shoreline. The stratified pumice lapilli-ash unit can be subdivided into at least three depositional units, with the lowermost one being clast supported. The unit contains grains in five separate size modes and has a >12 phi range. Particles are chiefly sub-rounded pumice clasts, lithic clasts, crystal fragments, and glass shards. Pumice clasts are very poorly segregated from other particle types, and lithic clasts occur throughout the deposit; fine particles are weakly density graded. We interpret the unit to record multiple closely spaced (< 2 d) hot pyroclastic density currents that flowed over the ocean, releasing pyroclasts onto the water surface, and settling of the various pyroclasts into the water column. Our settling and hot and cold flotation experiments show that waterlogging of pumice clasts at the water surface would have been immediate. The overall poor hydraulic sorting of the deposit resulted from mixing of particles from multiple pulses of vertical settling in the water column, attesting to complex sedimentation. Slow-settling particles were deposited on the seafloor together with faster-descending particles that were delivered at the water surface by subsequent pyroclastic flows. The final sediment pulses were eventually deflected upon their arrival on the seafloor and were deposited in laterally continuous facies. This study emphasizes the interaction between products of explosive volcanism and the ocean and discusses sedimentological complexities and hydrodynamics associated with particle delivery to water.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1480776
Journal Information:
Geological Society of America, Bulletin, Vol. 129, Issue 3-4; ISSN 0016-7606
Publisher:
Geological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

References (134)

Presence of large pumice blocks on Tierra del Fuego and South Shetland Islands shorelines, from 1962 South Sandwich Islands eruption journal July 2002
Kuroshio Current-influenced sandy contourites from the Plio-Pleistocene Kazusa forearc basin, Boso Peninsula, Japan journal January 2002
Widespread and progressive seafloor-sediment failure following volcanic debris avalanche emplacement: Landslide dynamics and timing offshore Montserrat, Lesser Antilles journal September 2012
The roseau ash: Deep-sea tephra deposits from a major eruption on Dominica, lesser antilles arc journal February 1980
Last millennium dispersal of air-fall tephra and ocean-rafted pumice towards the north Icelandic shelf and the Nordic seas
  • Larsen, Gudrún; Eiríksson, Jón; Gudmundsdóttir, Esther R.
  • Geological Society, London, Special Publications, Vol. 398, Issue 1 https://doi.org/10.1144/SP398.4
journal January 2014
Coring disturbances in IODP piston cores with implications for offshore record of volcanic events and the Missoula megafloods journal September 2014
Distal fluvio-lacustrine volcaniclastic resedimentation in response to an explosive silicic eruption: The Pliocene Mushono tephra bed, central Japan journal January 2005
Paleomagnetic evidence for high-temperature emplacement of the 1883 subaqueous pyroclastic flows from Krakatau Volcano, Indonesia journal May 1994
Products of neptunian eruptions journal July 2009
Timing, origin and emplacement dynamics of mass flows offshore of SE Montserrat in the last 110 ka: Implications for landslide and tsunami hazards, eruption history, and volcanic island evolution: MASS FLOWS OFFSHORE OF MONTSERRAT journal February 2013
Mobility of a large-volume pyroclastic flow — emplacement of the Campanian ignimbrite, Italy journal June 1993
Submarine pyroclastic deposits formed at the Soufrière Hills volcano, Montserrat (1995–2003): What happens when pyroclastic flows enter the ocean? journal January 2006
Rounding of pumice clasts during transport: field measurements and laboratory studies journal September 2010
Revised calendar date for the Taupo eruption derived by 14 C wiggle-matching using a New Zealand kauri 14 C calibration data set journal November 2011
Influence of convective sedimentation on the formation of widespread tephra fall layers in the deep sea journal January 1997
Subaqueous sediment density flows: Depositional processes and deposit types journal May 2012
Pyroclastic flows and surges over water: an example from the 1883 Krakatau eruption journal April 1996
Sedimentology of the Krakatau 1883 submarine pyroclastic deposits journal April 1996
An improved quantitative measure of the tendency for volcanic ash plumes to form in water: implications for the deposition of marine ash beds journal January 2015
Sedimentology of the Minoan deep-sea tephra layer in the Aegean and Eastern Mediterranean journal December 1983
Duration of large-magnitude explosive eruptions deduced from graded bedding in deep-sea ash layers journal January 1979
Submarine Sand Dunes and Sedimentary Environments in Oceanographer Canyon journal January 1984
Dispersal of volcaniclasts during deep-sea eruptions: Settling velocities and entrainment in buoyant seawater plumes journal August 2011
Vertical density currents: a review of their potential role in the deposition and interpretation of deep-sea ash layers journal December 2004
Abrasion in pyroclastic density currents: Insights from tumbling experiments journal January 2012
Settling velocity of glass shards journal June 1965
Emplacement processes of submarine volcaniclastic deposits (IODP Site C0011, Nankai Trough) journal September 2013
Chapter 20 Multi-stage collapse events in the South Soufrière Hills, Montserrat as recorded in marine sediment cores journal January 2014
The 26.5 ka Oruanui eruption, New Zealand: an introduction and overview journal December 2001
Subaerial to submarine transitions in early Miocene pyroclastic flow deposits, southern San Joaquin basin, California journal February 1991
Geomorphological evolution of Montserrat (West Indies): importance of flank collapse and erosional processes journal January 2004
Plinian and co-ignimbrite tephra fall from the journal June 1989
Grain-size distribution of volcaniclastic rocks 2: Characterizing grain size and hydraulic sorting journal August 2015
Crystal concentration in ignimbrites journal January 1972
Volcanological study of the great Tambora eruption of 1815 journal January 1984
Tephra dispersal and eruption dynamics of wet and dry phases of the 1875 eruption of Askja Volcano, Iceland journal October 2009
Comment on Pumice published by AG Whitham and RSJ Sparks journal June 1987
Fallout of volcanic ash to the deep South China Sea induced by the 1991 eruption of Mount Pinatubo (Philippines) journal January 1995
Facies architecture of individual basin-plain turbidites: Comparison with existing models and implications for flow processes journal May 2012
Effects of water depth on pumice formation in submarine domes at Sumisu, Izu-Bonin arc, western Pacific journal May 2010
K-Ar Geochronology and Palaeomagnetism of Volcanic Rocks in the Lesser Antilles Island Arc
  • Briden, J. C.; Rex, D. C.; Faller, A. M.
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 291, Issue 1383 https://doi.org/10.1098/rsta.1979.0040
journal July 1979
The saturation behaviour of pumice and some sedimentological implications journal July 1998
A vesicularity index for pyroclastic deposits journal September 1989
Combinations of volcanic-flank and seafloor-sediment failure offshore Montserrat, and their implications for tsunami generation journal February 2012
The volcanic evolution of Montserrat using 40 Ar/ 39 Ar geochronology journal January 2002
Late Pleistocene tephrochronology of marine sediments adjacent to Montserrat, Lesser Antilles volcanic arc journal January 2008
On the emplacement of ignimbrite in shallow-marine environments journal January 2000
The Eruption of Vesuvius in A. D. 79: Reconstruction from Historical and Volcanological Evidence journal January 1982
Volcano flank instability in the Lesser Antilles Arc: Diversity of scale, processes, and temporal recurrence journal January 2007
Proceedings of the Ocean Drilling Program, 126 Initial Reports book January 1989
Tephrochronology and its application: A review journal April 2011
Izu-Bonin-Mariana Rear Arc--The missing half of the subduction factory book January 2014
Evaluating the precision of Pb isotope measurement by mass spectrometry journal January 2015
Spatiotemporal evolution of a marine caldera-forming eruption, generating a low-aspect ratio pyroclastic flow, 7.3 ka, Kikai caldera, Japan: Implication from near-vent eruptive deposits journal November 2007
Post-1.8-ka Marginal Sedimentation in Lake Taupo, New Zealand: Effects of Wave Energy and Sediment Supply in a Rapidly Rising Lake book April 2001
Settling and Deposition of AD 181 Taupo Pumice in Lacustrine and Associated Environments book April 2001
Submarine pyroclastic deposits formed during the 20th May 2006 dome collapse of the Soufrière Hills Volcano, Montserrat journal September 2011
Hydrodynamic behaviour of Taupo 1800a pumice: implications for the sedimentology of remobilized pyroclasts journal October 2002
I. Several microscopical observations on the pumice-stone, coral, spunges, &c: In a letter from Mr Anthony Van Leuwenhock, F. R. S journal December 1705
Anatomy of a submarine pyroclastic flow and associated turbidity current: July 2003 dome collapse, Soufrière Hills volcano, Montserrat, West Indies journal June 2008
Facies architecture of a continental, below-wave-base volcaniclastic basin: The Ohanapecosh Formation, Ancestral Cascades arc (Washington, USA) journal February 2014
Volcanogenic Sedimentation in the Lesser Antilles Arc journal September 1980
Inverse Leidenfrost Phenomenon journal October 1969
Tracking the magmatic evolution of island arc volcanism: Insights from a high-precision Pb isotope record of Montserrat, Lesser Antilles journal January 2012
New insights into landslide processes around volcanic islands from Remotely Operated Vehicle (ROV) observations offshore Montserrat: MONTSERRAT LANDSLIDE ROV journal July 2015
Pyroclastic flows generated by gravitational instability of the 1996-97 Lava Dome of Soufriere Hills Volcano, Montserrat journal September 1998
The 1995–1998 eruption of the Soufriére Hills volcano, Montserrat, WI
  • Robertson, R. E. A.; Aspinall, W. P.; Herd, R. A.
  • Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, Vol. 358, Issue 1770 https://doi.org/10.1098/rsta.2000.0607
journal May 2000
Products of explosive subaqueous felsic eruptions based on examples from the Hellenic Island Arc, Greece book January 2003
Submarine deposition of volcaniclastic material from the 1995–2005 eruptions of Soufrière Hills volcano, Montserrat journal January 2009
A hot Miocene subaqueous scoria-flow deposit in the Shimane Peninsula, SW Japan journal March 1994
Submarine, silicic, syn-eruptive pyroclastic units in the Mount Read Volcanics, western Tasmania: Influence of vent setting and proximity on lithofacies characteristics book January 2003
Using hydraulic equivalences to discriminate transport processes of volcanic flows journal January 2006
The preservation potential of ash layers in the deep-sea: the example of the 1991-Pinatubo ash in the South China Sea journal December 2009
Submarine evidence for large-scale debris avalanches in the Lesser Antilles Arc journal October 2001
Lesser Antilles Volcanism and Landslides: Implications for hazard assessment and long-term magmatic evolution of the arc book March 2012
The 1986 Eruption of Mount St. Augustine: Field Test of a Hazard Evaluation journal May 1988
Subaqueous eruption-fed density currents and their deposits journal June 2000
Sediment Sorting in the Deposits of Turbidity Currents Created by Experimental Modeling of Explosive Subaqueous Eruptions journal January 2008
Late Pleistocene stratigraphy of IODP Site U1396 and compiled chronology offshore of south and south west Montserrat, Lesser Antilles journal July 2014
Two Plinian-type eruptions in the Azores journal January 1971
Diverse patterns of ascent, degassing, and eruption of rhyolite magma during the 1.8ka Taupo eruption, New Zealand: Evidence from clast vesicularity journal August 2010
Geochemical Evolution of the Soufriere Hills Volcano, Montserrat, Lesser Antilles Volcanic Arc journal August 2003
Interbedded Late Quaternary turbidites and contourites in Flemish Pass, off southeast Canada: Their recognition, origin and temporal variation journal May 2010
Overview of the eruption of Soufriere Hills Volcano, Montserrat, 18 July 1995 to December 1997 journal September 1998
Eruption of Soufrière Hills (1995-2009) from an offshore perspective: Insights from repeated swath bathymetry surveys: MONTSERRAT ERUPTION-OFFSHORE PERSPECTIVE journal June 2010
Submarine record of volcanic island construction and collapse in the Lesser Antilles arc: First scientific drilling of submarine volcanic island landslides by IODPExpedition 340 journal February 2015
Characteristics of submarine pumice-rich density current deposits sourced from turbulent mixing of subaerial pyroclastic flows at the shoreline: field and experimental assessment journal October 2011
Subduction of Atlantic aseismic ridges and Late Cenozoic evolution of the Lesser Antilles island arc journal April 1990
Subaqueous pyroclastic flows and ignimbrites: an assessment journal June 1991
The volcanic geology and petrology of Montserrat, West Indies journal July 1974
Timing and emplacement dynamics of newly recognised mass flow deposits at ~8–12ka offshore Soufrière Hills volcano, Montserrat: How submarine stratigraphy can complement subaerial eruption histories journal March 2013
Tsunami deposits from major explosive eruptions: An example from the 1883 eruption of Krakatau journal January 2001
The hazards of eruptions through lakes and seawater journal April 2000
Volume and extent of the Minoan tephra from Santorini Volcano: new evidence from deep-sea sediment cores journal January 1978
Pillow lavas and the Leidenfrost effect journal January 1984
Pliocene-Quaternary Submarine Pumice Deposits In The Sumisu Rift Area, Izu-Bonin Arc book January 1991
Submarine eruption-fed and resedimented pumice-rich facies: the Dogashima Formation (Izu Peninsula, Japan) journal September 2014
The relationship between eruptive activity, flank collapse, and sea level at volcanic islands: A long-term (>1 Ma) record offshore Montserrat, Lesser Antilles: FLANK COLLAPSES AT VOLCANIC ISLANDS journal July 2016
Grain-size distribution of volcaniclastic rocks 1: A new technique based on functional stereology journal September 2012
Primary volcaniclastic rocks journal January 2006
Physical volcanology of the 2,050 bp caldera-forming eruption of Okmok volcano, Alaska journal January 2005
The analysis of the influence of pumice shape on its terminal velocity journal January 2005
Deep submarine pyroclastic eruptions: theory and predicted landforms and deposits journal March 2003
Large volume submarine ignimbrites in the Shikoku Basin: An example for explosive volcanism in the Western Pacific during the Late Miocene journal May 2014
Transport of pyroclastic flows across the sea during the explosive, rhyolitic eruption of the Kos Plateau Tuff, Greece journal February 2001
Construction of volcanic records from marine sediment cores: A review and case study (Montserrat, West Indies) journal November 2014
Permeability development in vesiculating magmas: implications for fragmentation journal September 1996
Sumisu volcano, Izu-Bonin arc, Japan: site of a silicic caldera-forming eruption from a small open-ocean island journal June 2007
Rapid, Long-Distance Dispersal by Pumice Rafting journal July 2012
Evidence for carbonate platform failure during rapid sea-level rise; ca 14 000 year old bioclastic flow deposits in the Lesser Antilles: Voluminous bioclastic flow deposits, Lesser Antilles journal November 2009
On the fate of pumice rafts formed during the 2012 Havre submarine eruption journal April 2014
Rapid onset of mafic magmatism facilitated by volcanic edifice collapse: MAFIC MAGMATISM FACILITATED BY VOLCANIC EDIFICE COLLAPSE journal June 2015
Dynamics and deposits generated by the Kos Plateau Tuff eruption: Controls of basal particle loss on pyroclastic flow transport: KOS PLATEAU TUFF ERUPTION journal December 2007
Discharge of pyroclastic flows into the sea during the 1996?1998 eruptions of the Soufri�re Hills volcano, Montserrat journal February 2004
Tephra dispersal from Myojinsho, Japan, during its shallow submarine eruption of 1952-1953 journal February 1998
Littoral blasts: Pumice-water heat transfer and the conditions for steam explosions when pyroclastic flows enter the ocean journal January 2007
The Lesser Antilles volcanic chain: a study in arc magmatism journal March 2000
Resedimentation of cold pumiceous ignimbrite into water: facies transformations simulated in flume experiments journal August 2006
Volcaniclastic resedimentation in distal fluvial basins induced by large-volume explosive volcanism: the Ebisutoge-Fukuda tephra, Plio-Pleistocene boundary, central Japan: Volcaniclastic resedimentation in distal fluvial basins journal April 2002
Quenching of steam-charged pumice: Implications for submarine pyroclastic volcanism journal September 2008
Submarine silicic caldera at the front of the Izu-Bonin arc, Japan: Voluminous seafloor eruptions of rhyolite pumice journal July 2001
The sequence of events around the epicentre of the 1929 Grand Banks earthquake: initiation of debris flows and turbidity current inferred from sidescan sonar journal February 1999
Structure and physical characteristics of pumice from the climactic eruption of Mount Mazama (Crater Lake), Oregon journal October 2002
Explosive destruction of a Pliocene hot lava dome underwater: Dogashima (Japan) journal October 2015
Pumice journal August 1986
Multiple widespread landslides during the long-term evolution of a volcanic island: Insights from high-resolution seismic data, Montserrat, Lesser Antilles: WIDESPREAD LANDSLIDES OFF MONTSERRAT journal May 2011
The waterlogging of floating objects journal August 2007
Woody Pumice Generated with Submarine Eruption journal January 1987
Fallout of Pyroclastic Debris from Submarine Volcanic Eruptions journal July 1991
Krakatau revisited: The course of events and interpretation of the 1883 eruption journal October 1992
Transport capacity of pyroclastic density currents: Experiments and models of substrate-flow interaction: TRANSPORT CAPACITY OF PYROCLASTIC FLOWS journal November 2009
Ignimbrite types and ignimbrite problems journal September 1983
Entrance of hot pyroclastic flows into the sea: experimental observations journal March 2003
Data report: coring disturbances in IODP Expedition 340, a detailed list of intervals with fall-in and flow-in book February 2016

Cited By (1)


Similar Records

The pumice raft-forming 2012 Havre submarine eruption was effusive
Journal Article · Wed Mar 07 00:00:00 EST 2018 · Earth and Planetary Science Letters · OSTI ID:1480776

Pyroclast cooling and saturation in water
Journal Article · Wed Aug 15 00:00:00 EDT 2018 · Journal of Volcanology and Geothermal Research · OSTI ID:1480776

The largest deep-ocean silicic volcanic eruption of the past century
Journal Article · Wed Jan 10 00:00:00 EST 2018 · Science Advances · OSTI ID:1480776

Related Subjects