Abstract
Eruption of Volcan Hudson, Aisen region, Southern Chile on 12 August 1971 melted up to 80% of ice within the 9-km-wide Hudson Caldera. Rapid mobilisation of abundant fluvio-glacial sediment within the adjacent Huemules valley led to the generation of a catastrophic mass flow which swept westwards along the valley, eventually entering the fjord some 40 km downstream. The mass flow, developing from one source and being unaffected by tributary input, was characterised by three events within the flood hydrograph: (1) a precessional flood possibly linked to breakage of an early formed dammed lake; (2) a main mass flow which varied in its rheological behaviour from plug-flow to hyperconcentrated flow; and (3) a recessional flood at the tail of the main flow which diluted towards a concentrated streamflow. The main debris flow displayed characteristics of pulsing, internal segregation/density stratification, significant downstream sediment assimilation, cohesive/frictional freezing with ensuing fluidisation and development of an advancing runout phase. Consideration of these sedimentary characteristics and spatial/temporal flow transformations are used to propose a schematic model of event timing within this catastrophic volcaniclastic flow.
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References
Arguden AT, Rodolfo KS (1990) Sedimentologic and dynamic differences between hot and cold laharic debris flows of Mayon Volcano, Philippines. Geol Soc Amer Bull 102:865–876
Bagnold RA (1954) Experiments on a gravity-free dispersion of large solid spheres in a Newtonian fluid under shear. Proc R Soc Lond Series A 225:49–63
Bagnold RA (1955) Some flume experiments on large grains but little denser than the transporting fluid, and their implications. Proc Inst Civ Engnrs Lond Pt 3:174–205
Best JL (1989) Fluidization pipes in volcaniclastic mass flows, Volcan Hudson, Southern Chile. Terra Nova 1:203–208
Best JL, Brayshaw AC (1985) Flow separation — a physical process for the concentration of heavy minerals within alluvial channels. J Geol Soc Lond 142:747–755
Brayshaw AC (1984) Characteristics and origin of cluster bedforms in coarse-grained alluvial channels. In: Koster EH, Steel RJ (eds) Sedimentology of gravels and conglomerates. Can Soc Petrol Geol Memoir 10:77–85
Bridge JS, Best JL (1988) Flow, sediment transport and bedform dynamics over the transition from dunes to upper-stage plane beds: implications for the formation of planar laminae. Sedimentology 35:753–763
Cas RAF, Landis CA (1987) A debris-flow deposit with multiple plug-flow channels and associated side accretion deposits. Sedimentology 34:901–910
Costa JE (1984) Physical geomorphology of debris flows. In: Costa JE, Fleisher PJ (eds) Developments and applications of geomorphology. Springer, Berlin Heidelberg New York, pp 268–317
Crandell DR (1987) Deposits of the pre-1980 pyroclastic flows and lahars from Mount St Helens Volcano, Washington. US Geol Surv Prov Pap 1444:pp 1–91
Cummans J (1981) Mudflows resulting from the May 18, 1980, eruption of Mount St Helens, Washington. US Geol Surv Circular 850-B:pp 1–16
Enos P (1977) Flow regimes in debris flow. Sedimentology 24:133–142
Fisher RV (1971) Features of coarse-grained, high-concentration fluids and their deposits. J Sedim Petrol 41:916–927
Fisher RV (1983) Flow transformations in sediment gravity flows. Geology 11:273–274
Fritz WJ (1980) Stumps transported and deposited upright by Mount St Helens mud flows. Geology 8:586–588
Fritz WJ, Harrison S (1983) Giant armoured mud boulder from the 1982 Mount St Helens mudflows. J Sedim Petrol 53:131–133
Fritz WJ, Harrison S (1985) Transported trees from the 1982 Mount St Helens sediment flows: their use as palaeocurrent indicators. Sedim Geol 42:49–64
Fuenzalida RP (1976) The Volcan Hudson. In: Gonzales-Ferran O (ed) Proc IAVCEI Symposium on Andean and Antarctic volcanology problems:78–87
Fuenzalida RP, Espinosa W (1973) Hallazgo de una caldera volcanica en la provincia de Aisen (in Spanish). Rev Geol de Chile 1:64–66
Guzman JC (1981) Informe preliminar sobre del Volcan Hudson norte o Volcan Huemules (2nd edn 1981). Trapananda 1 1978:35–42
Hampton MA (1975) Competence of fine-grained debris flows. J Sedim Petrol 45:834–844
Hampton MA (1979) Buoyancy in debris flows. J Sedim Petrol 49:753–758
Harrison S, Fritz WJ (1982) Depositional features of March 1982 Mount St Helens sediment flows. Nature 299:720–722
Janda RJ, Scott KM, Nolan KM, Martinson HA (1981) Lahar movement, effects and deposits. In: Lipman PW, Mullineaux DR (eds) The 1980 eruptions of Mount St Helens, Washington. US Geol Surv Prof Paper 1250:461–478
Johnson AM (1970) Physical processes in geology. Freeman & Cooper, San Francisco, pp 1–577
Johnson AM (1984) Debris flow. In: Brunsden D, Prior DB (eds) Slope instability. Wiley, New York, pp 257–361
Lawson DE (1982) Mobilisation, movement and deposition of active subaerial sediment flows, Matanuska glacier, Alaska. J Geol 90:279–300
Lindsay JF (1968) The development of clast fabric in mudflows. J Sedim Petrol 38:1242–1253
Lindholm RC (1987) A practical approach to sedimentology. Allen & Unwin, London, pp 1–276
Lowe DR (1976) Subaqueous liquefied and fluidized sediment flows and their deposits. Sedimentology 23:285–308
Lowe DR (1979) Sediment gravity flows: their classification and some problems of application to natural flows and deposits. Soc Econ Palaeontol Minerologists Spec Publ 27:75–82
Lowe DR (1982) Sediment gravity flows: II. Depositional models with special reference to the deposits of high-density turbidity currents. J Sedim Petrol 52:279–297
Middleton GV (1970) Experimental studies related to problems of flysch sedimentation. In: Lajoie J (ed) Flysch sedimentology in North America. Geol Ass Canada Spec Publ 7:253–272
Muir-Wood R (1989) Recent normal faulting at the Laguna de San Rafael, Aisen province, Southern Chile. Una Revista Geol de Andina (Santiago de Chile) 40:57–68
Naylor MA (1980) The origin of inverse grading in muddy debris flow deposits — a review. J Sedim Petrol 50:1111–1116
Naranjo JL, Sigurdsson H, Carey SN, Fritz W (1986) Eruption of the Nevado del Ruiz volcano, Columbia, on 13 November 1985: tephra fall and lahars. Science 233:961–963
Nemec W, Steel RJ (1984) Alluvial and coastal conglomerates: their significant features and some comments on gravelly mass-flow deposits. In: Koster EH, Steel RJ (eds) Sedimentology of gravels and conglomerates. Can Soc Petrol Geol Memoir 10:1–31
Niemeyer HR, Skarmeta JM, Fuenzalida RP, Espinosa WN (1984) Hojas Peninsula de Taitao Y Puerto Aisen: Region Aisen del General Carlos Ibanez del Campo. Carta Geologica de Chile 1:500 000 Scale No 60-61
Osterkamp WR, Costa JE (1987) Changes accompanying an extraordinary flood on a sand-bed stream. In: Mayer L, Nash D (eds) Catastrophic flooding. Allen & Unwin, London, pp 201–224
Paola C, Wiele SM, Reinhart MA (1989) Upper-regime parallel lamination as the result of turbulent sediment transport and low-amplitude bed forms. Sedimentology 36:47–59
Pierson TC (1985) Initiation and flow behaviour of the 1980 Pine Creek and Muddy River lahars, Mount St Helens, Washington. Geol Soc Am Bull 96:1056–1069
Pierson TC, Scott KM (1985) Downstream dilution of a lahar: transition from debris flow to hyperconcentrated streamflow. Water Resources Res 21:1511–1524
Pierson TC, Janda RJ, Thouret JC, Borrero CA (1990) Perturbation and melting of snow and ice by the 13 November 1985 eruption of Nevado del Ruiz, Columbia, and consequent mobilisation, flow and deposition of lahars. J Volc Geotherm Res 41:17–66
Postma G, Roep TB, Ruegg GHJ (1983) Sandy-gravelly mass-flow deposits in an ice-marginal lake (Saalian, Leuvenumsche Beek valley, Veluwe, The Netherlands), with emphasis on plug-flow deposits. Sedim Geol 34:59–82
Postma G, Nemec W, Kleinspehn KL (1988) Large floating clasts in turbidites: a mechanism for their emplacement. Sedim Geol 58:47–61
Reed DJ, Muir-Wood R, Best JL (1987) Earthquakes, rivers and ice: scientific research at the Laguna San Rafael, Southern Chile, 1986. Geograph J 154:392–405
Sallenger AH (1979) Inverse grading and hydraulic equivalence in grain-flow deposits. J Sedim Petrol 49:553–562
Scott KM (1988) Origins, behaviour and sedimentology of lahars and lahar runout flows in the Toutle-cowlitz River system. US Geol Surv Prov Pap 1447-A:pp 1–74
Simons DB, Richardson EV, Haushild WL (1963) Some effects of fine sediment on flow phenomenae. US Geol Surv Water Suppl Pap 1498-G:pp 1–45
Smith GA (1986) Coarse-grained nonmarine volcaniclastic sediment: terminology and depositional process. Geol Soc Am Bull 97:1–10
Smith GA (1987a) Sedimentology of volcanism-induced aggradation in fluvial basins: examples from the Pacific northwest, USA. In: Ethridge FG, Flores RM, Harvey MG Recent developments in fluvial sedimentology. Spec Publ Soc Econ Paleontol Mineralogists 39:217–228
Smith GA (1987b) The influence of explosive volcanism on fluvial sedimentation: the Deschutes formation (Neogene) in central Oregon. J Sedim Petrol 57:613–629
Tobar A (1973) Report on the eruption of Mt Hudson. Bull Volc Erupt 11:43
Tobar A, Fuenzalida RP (1975) Report on the activity of Mt Hudson. Bull Volc Erupt 13:62
Todd SP (1989) Stream-driven, high-density gravelly traction carpets: possible deposits in the Trabeg conglomerate formation, SW Ireland and some theoretical considerations of their origin. Sedimentology 36:513–530
Waitt RB, Pierson TC, MacLeod NS, Janda RJ, Voight B, Holcomb RT (1983) Eruption-triggered avalanche, flood, and lahar at Mount St Helens — effects of winter snowpack. Science 221:1394–1397
Wilson CJN (1980) The role of fluidization in the emplacement of pyroclastic flows: an experimental approach. J Volc Geotherm Res 8:231–249
Wilson CJN (1984) The role of fluidization in the emplacement of pyroclastic flows, 2: experimental results and their interpretation. J Volc Geotherm Res 20:55–84
Wan Z (1987) Some phenomena associated with hyperconcentrated flow. In: Mechanics of sediment transport. Proc Euromech 156:189–194
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Best, J.L. Sedimentology and event timing of a catastrophic volcaniclastic mass flow, Volcan Hudson, Southern Chile. Bull Volcanol 54, 299–318 (1992). https://doi.org/10.1007/BF00301484
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DOI: https://doi.org/10.1007/BF00301484