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Subaqueous pyroclastic flows and ignimbrites: an assessment

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Abstract

An assessment of the literature on subaqueous pyroclastic flows and their deposits shows that the term “pyroclastic flow” is frequently used loosely to describe primary, hot gas-rich pyroclastic flows, mass-flows which resulted from the transformation of gassupported flows into water-supported ones, and secondary mass-flows carrying redeposited pyroclastic debris. Based on subaerial pyroclastic flows, the term “pyroclastic flow” should be restricted to demonstrably hot, gas-rich mass-flows of pyroclastic debris. Using this definition, very few examples of subaqueous pyroclastic deposits with evidence for hot emplacement and of having been wholly submerged have been described. In the majority of these cases, the evidence for a hot state of emplacement and for the subaqueous nature of the host depositional environment is inadequate. The only unequivocal cases of hot pyroclastic flow deposits with adequate supporting evidence are the Ordovician nearshore, shallow marine ignimbrites of Ireland and Wales, and Miocene ignimbrites of southwest Japan, resulting from the passage of subaerially erupted pyroclastic flows into shallow water. Other possible examples are near-vent dense clast deposits in the Donzurobo Formation of Japan, possible submarine intra-caldera ponded ignimbrite successions in California and Wales, and near-vent pumiceous deposits of Ramsay Island, Wales. All other purported cases are either clearly the result of water-supported mass-flow transportation and deposition (debris avalanches, debris flows, turbidity currents), or lack adequate supporting evidence regarding the heat state or the palaeoenvironment. Only the shallow marine ignimbrites of Ireland and Wales show adequate evidence of welding, but even these could have been nearly wholly exposed above sea-level when welding occurred. We conclude that when pyroclastic flows enter water they are generally disrupted explosively and/or ingest water and transform into water-supported mass-flows, and we suggest the various scenarios in which this occurs. There is no evidence to suggest that welding in wholly subaqueous environments is common.

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References

  • Abich H (1882) Geologische forschungen in den Kaukasischen Landern (geooogie des Armenischen Hochlandes). Wien, Alfred Holder 2, p 1–478

    Google Scholar 

  • Allen JRL (1982) Sedimentary structures: their character and physical basis. Devel Sed 30:1–663

    Google Scholar 

  • Allen RL (1986) Volcanism and sedimentation during the development of a mineralised submarine continental rift, southeastern Australia. IAVCEI Int Volcanol Cong New Zealand (Abstract) 345

  • Allen RL (1988) False pyroclastic textures in altered silicic lavas, with implications for volcanic-associated mineralisation. Econ Geol 83:1424–1446

    Google Scholar 

  • Aramaki S, Akimoto SI (1957) Temperature estimation of pyroclastic deposits by natural remanent magnetism. Am J Sci 225:619–627

    Google Scholar 

  • Aramaki S, Yamasaki M (1963) Pyroclastic flows in Japan, Bull Volcanol 26:89–99

    Google Scholar 

  • Bailes AH (1980) Origin of Early Proteozoic volcaniclastic turbidites, south margin of the Kisseynew sedimentary gneiss belt, File Lake, Manitoba. Precamb Res 12:197–225

    Google Scholar 

  • Bates RL, Jackson JA (1987) Glossary of Geology 3rd ed. Amer Geol Instit pp 1–788

  • Bond GC (1973) A late Paleozoic volcanic are in the eastern Alaska Range, Alaska. J Geol 81:557–575

    Google Scholar 

  • Bouma AH (1962) Sedimentology of some flysch deposits. Elsevier pp 1–168

  • Branney MJ (1986) Correspondence-Isolated pods of subaqueous welded ash-flow tuff: a distal facies of the Capel Curig Volcanic Formation (Ordovician), North Wales. Geol Mag 123:589–590

    Google Scholar 

  • Branney MJ, Sparks RSJ (in press) Fiamme formed by diagenesis and burial compaction in soils and subaqueous sediments. J Geol Soc Lond

  • Brenchley PJ, Pickerill RK (1980) Shallow subtidal sediments of Soudleyan (Caradoc) age in the Berwyn Hills, North Wales, and their palaeogeographic context. Proc Geol Assoc 91:177–194

    Google Scholar 

  • Busby-Spera CJ (1984a) The lower Mesozoic continental margin and marine intra-arc sedimentation at Mineral King, California. In: Bachman S, Crouch J (eds) Tectonics and sedimentation along the California margin. Soc Econ Palaeont Mineral Pac Sect 135–156

  • Busby-Spera CJ (1984b) Large volume rhyolite ash flow eruptions and submarine caldera collapse in the lower Mesozoic Sierra Nevada, California. J Geophys Res 89 (B10):8417–8427

    Google Scholar 

  • Busby-Spera CJ (1985) A sand rich submarine fan in the lower Mesozoic Mineral King Caldera complex, Sierra Nevada, California. J Sediment Petrol 55:376–391

    Google Scholar 

  • Busby-Spera CJ (1986) Depositional features of rhyolitic and andesitic volcaniclastic rocks of the Mineral King submarine caldera complex, Sierra Nevada, California. J Volcanol Geotherm Res 27:43–76

    Google Scholar 

  • Carey SN, Sigurdsson H (1980) The Roseau Ash: deep-sea tephra deposits from a major eruption on Dominica, Lesser Antilles arc. J Volcanol Geotherm Res 7:67–86

    Google Scholar 

  • Cas RAF (1979) Mass-flow arenites from a Palaeozoic interarc basin, New South Wales, Australia: mode and environment of emplacement. J Sediment Petrol 49:29–44

    Google Scholar 

  • Cas RAF (1983) Submarine ‘crystal-tuffs’: their origin using a Lower Devonian example from southeastern Australia. Geol Mag 120:471–486

    Google Scholar 

  • Cas RAF, Allen RL, Hutton DJ in press. Volcaniclastic megaturbidites: the submarine products of transformed subaerial pyroclastic flows. In Fisher RV, Smith GA (eds) Sedimentation in volcanic settings. Soc Econ Paleont Mineral Spec Pub

  • Cas RAF, Wright JV (1987) Volcanic successions: Modern and ancient. A geological approach to processes, products and successions. Allen and Unwin, London pp 1–518

    Google Scholar 

  • Condie KC, Nuter JA (1981) Geochemistry of the Dubois Greenstone succession: an early Proteozoic bimodal volcanic association in west-central Colorado. Precamb Res 15:131–155

    Google Scholar 

  • Corbett KD (1981) Stratigraphy and mineralisation in the Mt Read Volcanics, western Tasmania. Econ Geol 76:209–230

    Google Scholar 

  • Corbett KD (1989) Stratigraphy, Palaeogeography and geochemistry of the Mt Read Volcanics. In Burrett CF, Martin EL (eds) Geology and mineral resources of Tasmania. Geol Soc Aust Spec Pub 15:86–119

  • Dewey JF (1963) The lower Palaeozoic stratigraphy of central Murrisk, County Mayo, Ireland, and the evolution of the South Mayo Trough. Q J Geol Soc Lond 119:313–343

    Google Scholar 

  • Dimroth E, Damarcke J (1978) Petrography and mechanism of eruption of the Archean Dalembert tuff, Rouyn-Noranda, Quebec, Canada. Can J Earth Sci 15:1712–1723

    Google Scholar 

  • Fernandez HE (1969) Notes on the submarine ash-flow tuff in Siargao Island, Surigao del Norte (Philippines). Philipp Geol 23:29–36

    Google Scholar 

  • Fisher RV (1984) Submarine volcaniclastic rocks. In: Kokelaar BP, Howells MF (eds) Marginal basin geology: volcanic and associated sedimentary and tectonic processes in modern and ancient marginal basins. Geol Soc Lond Spec Pub 16:5–27

  • Fisher RV, Heiken G (1982) Mt Pelee, Martinique: May 8 and 20, 1902 pyroclastic flows and surges. J Volc Geotherm Res 13:339–371

    Google Scholar 

  • Fisher RV, Schmincke HU (1984) Pyroclastic rocks. Springer, Berlin New York Heidelberg, pp 1–472

    Google Scholar 

  • Fiske RS (1963) Subaqueous pyroclastic flows in the Ohanapecosh Formation, Washington. Geol Soc Am Bull 74:391–406

    Google Scholar 

  • Fiske RS, Matsuda T (1964) Submarine equivalents of ash flows in the Tokiwa Formation, Japan. Am J Sci 262:76–106

    Google Scholar 

  • Francis EH, Howells MF (1973) Transgressive welded ash-flow tuffs among the Ordovician sediments of NE Snowdonia. J Geol Soc Lond 129:621–641

    Google Scholar 

  • Francis P, Self S (1983) The eruption of Krakatau. Sci American 249:172–187

    Google Scholar 

  • Freundt A, Schmincke H-U (1986) Emplacement of small volume pyroclastic flows at Laacher See (East Eiffel, Germany) 48:39–60

    Google Scholar 

  • Gilbert CM (1938) Welded tuff in eastern California. Geol Soc Am Bull 49:1829–1862

    Google Scholar 

  • Green GB, Solomon M, Walshe JL (1981) The formation of the volcanic-hosted massive sulfide ore deposit at Rosebery, Tasmania. Econ Geol 76:304–338

    Google Scholar 

  • Groves DA, Morton RL, Franklin JM (1988) Physical volcanology of the footwall rocks near the Mattabi massive sulphide deposit, Sturgeon Lake, Ontario. Can J Earth Sci 25:280–291

    Google Scholar 

  • Guber AL, Green GR (1983) Aspects of the sedimentologic and structural development of the eastern Hokuroku district, Japan. In Ohnoto H, Skinner BJ (eds) The Kuroko and related volcanogenic massive sulfide deposits. Econ Geol Monogr 5:71–95

  • Heiken G, Wohletz KH (1985) Volcanic ash. Univ Calif Press pp 1–246

  • Hoblitt RP, Kellogg KS (1979) Emplacement temperatures of unsorted and unstratified deposits of volcanic rock debris as determined by palaeomagnetic techniques. Geol Soc Am Bull Pt 1. 90:633–642

    Google Scholar 

  • Howells MF, Campbell DG, Reedman AJ (1985) Isolated pods of subaqueous welded ash-flow tuff: a distal facies of the Capel Curig Volcanic Formation (Ordovician), North Wales. Geol Mag 122:175–180

    Google Scholar 

  • Howells MF, Leveridge BE, Addison R, Evans CDR, Nutt MJC (1979) The Capel Curig Volcanic Formation, Snowdonia, North Wales; variations in ash-flow tuffs related to emplacement environment. In: Harris AL, Holland CH, Leake BE (eds) The Caledonides of the British Isles — reviewed. Geol Soc Lond Spec Pub 8:611–618

  • Howells MF, Reedman AJ, Campbell SDG (1986) The submarine eruption and emplacement of the lower Rhyolitic Tuff Formation (Ordovician), North Wales. J Geol Soc 143:411–423

    Google Scholar 

  • Kano K (1990) An ash-flow tuff emplaced in shallow water, Early Miocene Koura Formation southwest Japan. J. Volc Geotherm Res 40:1–9

    Google Scholar 

  • Kano K, Nakano S, Mimura K (1989) Deformation structures in shale bed indicate flow direction of overlying Miocene subaqueous pyroclastic flow. Bull Volcanol 50:380–385

    Google Scholar 

  • Kato I, Muroi I, Yamazaki T, Abe M (1971) Subaqueous pyroclastic flow deposits in the Upper Donzurobo Formation, Nijosan district, Osaka, Japan. J Geol Japan 77:193–206

    Google Scholar 

  • Kieffer S (1982) Fluid dynamics of the May 18 blast at Mount St Helens. In: Lipman PW, Mullineaux DR (eds) The 1980 eruptions of Mount St Helens. USGS Prof Pap 1250:379–400

  • Keller J (1970) Origin of rhyolites by anatectic melting of granitic crustal rocks. The example of rhyolitic pumice from the island of Kos (Aegean Sea). Bull Volcanol 33:942–959

    Google Scholar 

  • Kent DV, Ninkovich D, Pescatore T, Sparks RSJ (1981) Palaeomagnetic determination of emplacement temperature of Vesuvius AD 79 pyroclastic deposits. Nature 290:393–396

    Google Scholar 

  • Kokelaar BP, Howells MF, Bevins RE, Roach RA (1984) Volcanic and associated sedimentary and tectonic processes in the Ordovician marginal basin of Wales: a field guide. In: Kokelaar B, Howells MF (eds) Marginal basin geology. Volcanic and associated sedimentary and tectonic processes in modern and ancient marginal basins. Geol Soc Lond Spec Pub pp 291–322

  • Kokelaar BP, Bevins RE, Roach RA (1985) Submarine silicic volcanism and associated sedimentary and tectonic processes, Ramsay Island, SW Wales. J Geol Soc Lond 142:591–613

    Google Scholar 

  • La Croix A (1904) La Montagne Pelée et ses eruptions. Masson et Cie Paris pp 1–653

    Google Scholar 

  • Lock BE (1972) A lower Palaeozoic rheo-ignimbrite from White Bay, Newfoundland. Can J Earth Sci 9:1495–1503

    Google Scholar 

  • Lock BE (1978) Ultrahigh-temperature volcanic mudflows amongst the Drakensberg volcanic rocks: New criteria for their recognition. Trans Geol Soc S Afr 81:55–59

    Google Scholar 

  • Lowe DR (1975) Water escape structures in coarse grained sediments. Sedimentology 22:157–204

    Google Scholar 

  • Lowe DR (1982) Sediment gravity flows: II. Depositional models with special reference to the deposits of high density turbidity currents. J Sediment Petrol 52:279–297

    Google Scholar 

  • Lowman RDW, Bloxam TW (1981) The petrology of the Lower Palaeozoic Fishguard Volcanic Group and associated rocks E of Fishguard, N Pembrokeshire. (Dyfed), South Wales. J Geol Soc Lond 138:47–68

    Google Scholar 

  • MacDonald GA (1972) Volcanoes. Prentice-Hall, New Jersey pp 1–510

    Google Scholar 

  • Maury R (1973) La matière organique des bois fossiles, indicatrice des conditions thermiques de mise in place des brèches volcaniques. CR Acad Sci Paris 276, Ser D:917–920

    Google Scholar 

  • Miller TP, Smith RL (1977) Spectacular mobility of ash flows around Aniakchak and Fisher Calderas, Alaska. Geology 5:173–176

    Google Scholar 

  • Morton RL, Nebel M (1983) Physical character of Archean felsic volcanism in the vicinity of the Helen Iron Mine, Wawa, Ontario, Canada. Precamb Res 20:39–62

    Google Scholar 

  • Mutti E (1965) Submarine flood tuffs (ignimbrite) associated with turbidites in Oligocene deposits of Rhodes Island (Greece). Sedimentology 5:265–288

    Google Scholar 

  • Niem DR (1977) Mississippian pyroclastic flow and ash-fall deposits in the deep marine Ouchita flysch basin, Oklahoma and Arkansas, Geol Soc Am Bull 88:49–61

    Google Scholar 

  • Nomura R (1986) Geology of the central part in the Shimane Peninsula, Part 2: biostratography and paleoenvironment viewed from benthic foraminifera. J Geol Soc Japan 92:461–475

    Google Scholar 

  • Ohmoto H, Takahashi T (1983) Submarine calderas and Kuroko genesis. In Ohmoto H, Skinner BJ (eds) The Kuroko and related volcanogenic massive sulfide deposits. Econ Geol Monogr 5:39–54

  • Orton G (1987) Discussion on the submarine eruption and emplacement of the Lower Rhyolitic Tuff Formation (Ordovician), North Wales, J Geol Soc Lond 144:523–524

    Google Scholar 

  • Orton GJ (1988a) Volcaniclastic sedimentation in a Caradocian marginal basin. Unpub PhD thesis, Oxford:252 pp

  • Orton GJ (1988b) A spectrum of Middle Ordovician fan deltas and braidplain deltas: a consequence of varying fluvial clastic input. In: Nemec W, Steel R (eds) Fan deltas: sedimentology and tectonic settings. Blackie & Son, Glasgow, pp 23–49

    Google Scholar 

  • Orton GJ (1989) Disintegration of Ordovician pyroclastic flows upon entry into the sea, North Wales, U.K.: implications for subaqueous welding. Abstract IAVCEI Congr, Santa Fe, New Mexico Bur Mines Mineral Res Bull 131:p. 209

  • Packham GH (1968) The Lower and Middle Palaeozoic stratigraphy and sedimentary tectonics of the Sofala-Hill End-Euchareena region NSW. Proc Linnean Soc NSW 93:111–163

    Google Scholar 

  • Padgham WA (1980) An Archean ignimbrite at Yellowknife and its relationship to the Kam Formation basalts. Precamb Res 12:99–113

    Google Scholar 

  • Pickerill RK, Brenchley PJ (1979) Caradoc marine benthic communities of the South Berwyn Hills, North Wales. Palaeontology 22:229–264

    Google Scholar 

  • Pudsey CJ (1984) Fluvial to marine transition in the Ordovician of Ireland — a humid-region fandelta? Geol J 19:143–172

    Google Scholar 

  • Rankin DW (1960) Palaeogeographic implications of deposits of hot ash flows. Rept of 21st Session (Norway) Intern Geol Cong Pt X 11:19–34

    Google Scholar 

  • Reading HG (ed; 1987) Sedimentary environments and facies. 2nd Ed. Blackwell pp 1–615

  • Reedman AJ, Howells MF, Orton G, Campbell SDG (1987) The Pitts Head Tuff Formation: a subaerial to submarine welded ash-flow tuff of Ordovician age, North Wales. Geol Mag 124:427–439

    Google Scholar 

  • Reedman AJ, Colman TB, Campbell SDG, Howells MF (1985) Volcanogenic mineralization related to the Snowdon Volcanic Group (Ordovician), Gwynedd, North Wales, J Geol Soc Lond 142:875–888

    Google Scholar 

  • Roobol MJ, Smith AL, Wright JV (1987) Lithic breccias in pyroclastic flow deposits on St Kitts, West Indies. Bull Volcanol 49:694–707

    Google Scholar 

  • Self S, Rampino MR (1981) The 1883 eruption of Krakatoa. Nature 294:699–704

    Google Scholar 

  • Smith GA (1986) Coarse grained nonmarine volcaniclastic sediment: terminology and depositional process. Geol Soc Am Bull 97:1–10

    Google Scholar 

  • Sparks RSJ (1976) Grain size in ignimbrites and implications for the transport of pyroclastic flows. Sedimentology 23:147–188

    Google Scholar 

  • Sparks RSJ, Carey S (1978) Subaqueous deposits and structures formed by the entry of pyroclastic flows into the sea in the Lesser Antilles arc. (abst). Abs with Prog Joint Meeting GAC, MAC, GSA Toronto

  • Sparks RSJ, Sigurdsson H, Carey SN (1980a) The entrance of pyroclastic flows into the sea. I. Oceanographic and geologic evidence from Dominica, Lesser Antilles. J Volcanol Geotherm Res 7:87–96

    Google Scholar 

  • Sparks RSJ, Sigurdsson H, Carey SN (1980b) The entrance of pyroclastic flows into the sea. II. Theoretical considerations on subaqueous emplacement and welding. J Volcanol Geotherm Res 7:97–105

    Google Scholar 

  • Stanton WI (1960) The lower Palaeozoic rocks of southwest Murrisk, Ireland. Q J Geol Soc Lond 116:269–296

    Google Scholar 

  • Tasse N, Lajoie J, Dimroth E (1978) The anatomy and interpretation of an Archean volcaniclastic sequence, Noranda region, Quebec. Can J Earth Sci 15:874–888

    Google Scholar 

  • Thurston PC (1980) Subaerial volcanism in the Archean Uchi-Confederation volcanic belt. Precamb Res 12:79–98

    Google Scholar 

  • Von Fritsch R, Reiss W (1868) Geologische Beschreibung der Insel Tenerife. Wurster and Co, Winterthur, pp 1–494

    Google Scholar 

  • Walker GPL (1979) A volcanic ash generated by explosion where ignimbrite entered the sea. Nature 281:642–646

    Google Scholar 

  • Walker RG (ed; 1984) Facies models. 2nd edn. Geosci Can Repr Ser 1 pp 1–317

  • Whitham AG (1989) The behaviour of subaerially produced pyroclastic flows in a subaqueous environment: evidence from the Roseau eruption, Dominica, West Indies. Mar Geol 86:27–40

    Google Scholar 

  • Wilson CJN (1980) The role of fluidisation in the emplacement of pyroclastic flows: an experimental approach. J Volcanol Geotherm Res 8:231–249

    Google Scholar 

  • Wilson CJN (1984) The role of fluidisation in the emplacement of pyroclastic flows, 2: experimental results and their interpretation. J Volcanol Geotherm Res 20:55–84

    Google Scholar 

  • Wilson CJN, Walker GPL (1982) Ignimbrite depositional facies: the anatomy of a pyroclastic flow. J Geol Soc Lond 139:581–592

    Google Scholar 

  • Wilson L, Sparks RSJ, Huang TC, Watkins ND (1978) The control of eruption column heights by eruption energetics and dynamics. J Geophys Res 83:1829–1836

    Google Scholar 

  • Wright JV (1978) Remanent magnetism of poorly sorted deposits from the Minoan eruption of Santorini. Bull Volcanol 41:131–135

    Google Scholar 

  • Wright JV, Cas RAF (1986) Critical assessment of the concept of subaqueous pyroclastic flows and ignimbrites. IAVCEI Int Cong New Zealand (Abstract) 89

  • Wright JV, Coward MP (1977) Rootless vents in welded ash-flow tuffs from northern Snowdonia, North Wales, indicating deposition in a shallow water environment. Geol Mag 114:133–140

    Google Scholar 

  • Wright JV, Mutti E (1981) The Dali Ash, Island of Rhodes, Greece: a problem in interpreting submarine volcanigenic sediments. Bull Volcanol 44:153–167

    Google Scholar 

  • Wright JV, Self S, Fisher RV (1980) A working terminology of pyroclastic deposits. J Volcanol Geotherm Res 8:315–336

    Google Scholar 

  • Wright JV, Self S, Fisher RV (1981) Towards a facies model for ignimbrite eruptions. In: Self S, Sparks RSJ (eds) Tephra studies. Reidel, Dordrecht 433–439

    Google Scholar 

  • Wright JV, Smith AL, Self S (1980) A working terminology of pyroclastic deposits. J Volcanol Geotherm Res 8:315–336

    Google Scholar 

  • Yamada E (1973) Subaqueous pumice flows in the Onikobe Caldera, Miyagi Prefecture, Japan. J Geol Soc Japan 79:585–597

    Google Scholar 

  • Yamada E (1984) Subaqueous pyroclastic flows: their development and their deposits. In: Kokelaar BP, Howells MF (eds) Marginal basin geology: volcanic and associated sedimentary and tectonic processes in modern and ancient marginal basins. Geol Soc Lond Spec Pub 29–35

  • Yamazaki T, Kato I, Muroi I, Abe M (1973) Textural analysis and flow mechanisms of the Donzurobo subaqueous pyroclastic flow deposits. Bull Volcanol 37:231–244

    Google Scholar 

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  1. Department of Earth Sciences, Monash University, 3168, Clayton, Victoria, Australia

    Ray AF Cas & John V Wright

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Cas, R.A., Wright, J.V. Subaqueous pyroclastic flows and ignimbrites: an assessment. Bull Volcanol 53, 357–380 (1991). https://doi.org/10.1007/BF00280227

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