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Evolution of a non-resurgent cauldron: the Late Permian Coombadjha Volcanic Complex, northeastern New South Wales, Australia

Published online by Cambridge University Press:  01 May 2009

J. McPhie
J. McPhie
Affiliation:
Department of Geology and Geophysics, University of New England, Armidale, NSW 2351, Australia
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Abstract

The Coombadjha Volcanic Complex is the remnant of a Late Permian cauldron. It is part of an extensive sequence of silicic calc-alkaline volcanics that covers the southeastern portion of the New England Orogen in NSW. The Complex is elliptical, measuring 15 × 24 km, and is outlined by a ring pluton and an arcuate fault. Bedding in the volcanic units of the Complex defines a structural basin, with steep inward dips at the monoclinal rim and gentle to horizontal orientations near the centre. An older group of outflow ignimbrites, lavas, breccias and volcaniclastic rocks at least 1500 m thick, is conformably overlain by more than 500 m of texturally homogeneous, crystal-rich, dacitic ignimbrite. Ignimbrites of the older group are the products of several discrete eruptions from separate vents, all of which were situated outside the Coombadjha area. Silicic lava domes with volcaniclastic aprons, and a tuff ring, mark the positions of local vents active on a small scale during intervals between the emplacement of the outflow ignimbrites. No significant subsidence occurred, nor did a caldera exist at this stage. Cauldron subsidence occurred in response to the large magnitude eruption that produced the crystal-rich ignimbrite. The central cauldron block was lowered at least 2000 m by downwarping and fault displacement, and remained largely intact. There is no evidence for resurgent doming of the cauldron after subsidence, although igneous activity continued with intrusion of an adamellite ring pluton along much of the cauldron margin. The crystal-rich ignimbrite and the ring pluton are similar in composition and may have been successive products of a common magma source that sustained this simple, single cauldron cycle.

Type
Articles
Information
Geological Magazine , Volume 123 , Issue 3 , May 1986 , pp. 257 - 277
Copyright
Copyright © Cambridge University Press 1986

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References

Bailey, R. A., Dalrymple, G. B. & Lanphere, M. A. 1976. Volcanism, structure and geochronology of Long Valley caldera, Mono County, California. Journal of Geophysical Research 81, 725–44.CrossRefGoogle Scholar
Briggs, N. D. 1976. Welding and crystallisation zonation in Whakamaru Ignimbrite, Central North Island, New Zealand. New Zealand Journal of Geology and Geophysics 19, 189–212.CrossRefGoogle Scholar
Byers, F. M., Carr, W. J., Orkild, P. P., Quinlivan, W. D. & Sargent, K. A. 1976. Volcanic suites and related cauldrons of Timber Mountain–Oasis Valley caldera complex, southern Nevada. United States Geological Survey, Professional Paper 919, 70 pp.Google Scholar
Cas, R. A. F. 1983. Submarine ‘crystal tuffs’: their origin using a Lower Devonian example from southeastern Australia. Geological Magazine 120, 471–86.CrossRefGoogle Scholar
Christiansen, R. L. 1979. Cooling units and composite sheets in relation to caldera structure. In Ash-flow Tuffs (eds. Chapin, C. E. and Elston, W. E.), pp. 29–42. Geological Society of America, Special Paper 180.CrossRefGoogle Scholar
Christiansen, R. L. & Blank, H. R. 1972. Volcanic stratigraphy of the Quaternary rhyolite plateau in Yellowstone National Park. United States Geological Survey, Professional Paper 729-B, 18 pp.Google Scholar
Crandell, D. R. 1971. Postglacial lahars from Mount Rainier volcano, Washington. United States Geological Survey, Professional Paper 677, 75pp.Google Scholar
Crowe, B. M. & Fisher, R. V. 1973. Sedimentary structures in base-surge deposits with special reference to cross-bedding, Ubehebe Craters, Death Valley, California. Geological Society of America, Bulletin 84, 663–82.2.0.CO;2>CrossRefGoogle Scholar
Day, R. W., Murray, C. G. & Whitaker, W. G. 1978. The eastern part of the Tasman Orogenic Zone. Tectonophysics 48, 327–64.CrossRefGoogle Scholar
Deal, E. G., Elston, W. E., Erb, E. E., Peterson, S. L., Reiter, D. E., Damon, P. E. & Shafiqullah, M. 1978. Cenozoic volcanic geology of the Basin and Range province in Hidalgo County, southwesternmost New Mexico: progress report no. 1. New Mexico Geological Society, Guidebook of Land of Cochise, 29th Field Conference 219–29.Google Scholar
Druitt, T. H. & Sparks, R. S. J. 1982. A proximal ignimbrite breccia facies on Santorini, Greece. Journal of Volcanology and Geothermal Research 13, 147–71.CrossRefGoogle Scholar
Ekren, E. G. & Byers, F. M. 1976. Ash-flow fissure vent in west-central Nevada. Geology 4, 247–51.2.0.CO;2>CrossRefGoogle Scholar
Elston, W. E. 1984. Mid-Tertiary ash flow tuff cauldrons, southwestern New Mexico. Journal of Geophysical Research 89, 8733–50.CrossRefGoogle Scholar
Ewart, A. 1979. A review of the mineralogy and chemistry of Tertiary-Recent dacitic, latitic, rhyolitic, and related salic volcanic rocks. In Trondhjemites, Dacites and Related Rocks (ed. Barker, F.), pp. 13–121. Amsterdam: Elsevier.CrossRefGoogle Scholar
Fergusson, C. L. 1984. The Gundahl Complex of the New England Fold Belt, eastern Australia: a tectonic melange formed in a Palaeozoic subduction complex. Journal of Structural Geology 6, 257–71.CrossRefGoogle Scholar
Fink, J. H. 1983. Structure and emplacement of a rhyolitic obsidian flow: Little Glass Mountain, Medicine Lake Highland, northern California. Geological Society of America, Bulletin 94, 362–80.2.0.CO;2>CrossRefGoogle Scholar
Fisher, R. V. & Waters, A. C. 1970. Base surge bed forms in maar volcanoes. American Journal of Science 268, 157–80.CrossRefGoogle Scholar
Flood, R. H., Vernon, R. H., Shaw, S. E. & Chappell, B. W. 1977. Origin of pyroxene-plagioclase aggregates in a rhyodacite. Contributions to Mineralogy and Petrology 60, 299–309.CrossRefGoogle Scholar
Francis, P. W. & Baker, M. C. W. 1978. Sources of two largeignimbrites in the Central Andes: some LANDSAT evidence. Journal of Volcanology and Geothermal Research 4, 81–7.CrossRefGoogle Scholar
Irvine, T. N. & Baragar, W. R. A. 1971. A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences 8, 523–48.CrossRefGoogle Scholar
Kuno, H., Ishikawa, T., Katsui, Y., Yagi, K., Yamasaki, M. & Taneda, S. 1964. Sorting of pumice and lithic fragments as a key to eruptive and emplacement mechanism. Japanese Journal of Geology and Geography 35, 223–38.Google Scholar
Leitch, E. C. 1974. The geological development of the southern part of the New England Fold Belt. Journal of the Geological Society of Australia 21, 133–56.CrossRefGoogle Scholar
Lipman, P. W. 1975. Evolution of Platoro caldera complex and related volcanic rocks, southeastern San Juan Mountains, Colorado. United States Geological Survey, Professional Paper 852, 128 pp.Google Scholar
Lipman, P. W. 1976. Caldera-collapse breccias in the western San Juan Mountains, Colorado. Geological Society of America, Bulletin 87, 1397–410.2.0.CO;2>CrossRefGoogle Scholar
Lipman, P. W. 1984. The roots of ash flow calderas in Western North America: windows into the tops of granitic batholiths. Journal of Geophysical Research 89, 8801–41.CrossRefGoogle Scholar
Lipman, P. W., Doe, B. R., Hedge, C. E. & Steven, T. A. 1978. Petrologic evolution of the San Juan volcanic field southwestern Colorado: Pb and Sr isotope evidence. Geological Society of America, Bulletin 89, 59–82.2.0.CO;2>CrossRefGoogle Scholar
Lipman, P. W., Steven, T. A., Luedke, R. G. & Burbank, W. S. 1973. Revised volcanic history of the San Juan, Uncompahgre, Silverton, and Lake City calderas in the western San Juan Mountains, Colorado. United States Geological Survey, Journal of Reseach 1, 627–42.Google Scholar
Luedke, R. G. & Burbank, W. S. 1968. Volcanism and cauldron development in the western San Juan Mountains, Colorado. In Studies in Volcanology (eds. Coats, R. R. and others), pp. 175–208. Geological Society of America, Memoir 116.Google Scholar
Mahood, G. A. 1980. Geological evolution of a Pleistocene rhyolitic center – Sierra La Primavera, Jalisco, Mexico. Journal of Volcanology and Geothermal Research 8, 199–230.CrossRefGoogle Scholar
McKee, E. H. 1979. Ash-flow sheets and calderas: their genetic relationship to ore deposits in Nevada. In Ash-flow Tuffs (eds. Chapin, C. E. and Elston, W. E.), pp. 205–11. Geological Society of America, Special paper 180.CrossRefGoogle Scholar
McPhie, J. 1982. The Coombadjha Volcanic Complex: a Late Permian cauldron, northeastern New South Wales. In New England Geology (eds. Flood, P. G. and Runnegar, B.), pp. 221–7. Armidale: Department of Geology, University of New England and AHV Club.Google Scholar
McPhie, J. & Fergusson, C. L. 1983. Dextral movement on the Demon Fault, northeastern New South Wales: a reassessment. Royal Society of New South Wales, Journal and Proceedings 116, 123–7.Google Scholar
Moore, J. G. 1967. Base surge in recent volcanic eruptions. Bulletin Volcanologique 30, 337–63.CrossRefGoogle Scholar
Newhall, C. G. & Melson, W. G. 1983. Explosive activity associated with the growth of volcanic domes. Journal of Volcanology and Geothermal Research 17, 111–31.CrossRefGoogle Scholar
Olgers, F., Flood, P. G. & Robertson, A. D. 1974. Palaeozoic geology of the Warwick and Goondiwindi 1:250000 Sheet areas, Queensland and New South Wales. Australian Bureau of Mineral Resources, Geology and Geophysics, Report 164, 109 pp.Google Scholar
Ratté, J. C. & Steven, T. A. 1967. Ash flows and related volcanic rocks associated with the Creede caldera, San Juan Mountains, Colorado. United States Geological Survey, Professional Paper 524-H, 58 pp.Google Scholar
Ross, C. S. & Smith, R. L. 1961. Ash-flow tuffs: their origin, geologic relations, and identification. United States Geological Survey, Professional Paper 366, 81 pp.Google Scholar
Schmincke, H-U., Fisher, R. V. & Waters, A. C. 1973. Antidune and chute and pool structures in the base surge deposits of the Laacher See area, Germany. Sedimentology 20, 553–74.CrossRefGoogle Scholar
Self, S., Kienle, J. & Huot, J-P. 1980. Ukinrek Maars, Alaska, II. Deposits and formation of the 1977 craters. Journal of Volcanology and Geothermal Research 7, 39–65.CrossRefGoogle Scholar
Smith, R. L. 1960. Ash flows. Geological Society of America, Bulletin 71, 795–842.CrossRefGoogle Scholar
Smith, R. L. 1979. Ash-flow magmatism. In Ash-flow Tuffs (eds. Chapin, C. E. and Elston, W. E.), pp. 5–27. Geological Society of America, Special Paper 180.CrossRefGoogle Scholar
Smith, R. L. & Bailey, R. A. 1968. Resurgent cauldrons. In Studies in Volcanology (eds. Coats, R. R. and others), pp. 613–62. Geological Society of America, Memoir 116.CrossRefGoogle Scholar
Smith, R. L., Bailey, R. A. & Ross, C. S. 1961. Structural evolution of the Valles caldera, New Mexico, and its bearing on the emplacement of ring dikes. United States Geological Survey, Professional Paper 424-D, 145–9.Google Scholar
Sparks, R. S. J. 1975. Stratigraphy and geology of the ignimbrites of Vulsini Volcano, Central Italy. Geologische Rundschau 64, 497–523.CrossRefGoogle Scholar
Sparks, R. S. J., Self, S. & Walker, G. P. L. 1973. Products of ignimbrite eruptions. Geology 1, 115–18.2.0.CO;2>CrossRefGoogle Scholar
Walker, G. P. L. 1973. Length of lava flows. Philosophical Transactions of the Royal Society of London, Series A 274, 107–118.Google Scholar
Walker, G. P. L. 1984 a. Characteristics of dune-bedded pyroclastic surge bedsets. Journal of Volcanology and Geothermal Research 20, 281–96.CrossRefGoogle Scholar
Walker, G. P. L. 1984 b. Downsag calderas, ring faults, caldera sizes, and incremental caldera growth. Journal of Geophysical Research 89, 8407–16.CrossRefGoogle Scholar
Walker, G. P. L. 1985. Origin of coarse lithic breccias near ignimbrite source vents. Journal of Volcanology and Geothermal Research 25, 157–71.CrossRefGoogle Scholar
Walker, G. P. L. & Croasdale, R. 1972. Characteristics of some basaltic pyroclastics. Bulletin Volcanologique 35, 303–17.CrossRefGoogle Scholar
Waters, A. C. & Fisher, R. V. 1971. Base surges and their deposits: Capelinhos and Taal volcanoes. Journal of Geophysical Research 76, 5596–614.CrossRefGoogle Scholar
Wilson, C. J. N., Rogan, A. M., Smith, I. E. M, Northey, D. J., Nairn, I. A. & Houghton, B. F. 1984. Caldera volcanoes of the Taupo Volcanic Zone, New Zealand. Journal of Geophysical Research 89, 8463–84.CrossRefGoogle Scholar
Wohletz, K. H. & Sheridan, M. F. 1983. Hydrovolcanic explosions II. Evolution of basaltic tuff rings and tuff cones. American Journal of Science 283, 385–413.CrossRefGoogle Scholar
Wolff, J. A. & Wright, J. V. 1981. Rheomorphism of welded tuffs. Journal of Volcanology and Geothermal Research 10, 13–34.CrossRefGoogle Scholar
Wright, J. V. & Walker, G. P. L. 1977. The ignimbrite source problem: significance of a co-ignimbrite lag-fall deposit. Geology 5, 729–32.2.0.CO;2>CrossRefGoogle Scholar
Wright, J. V., Self, S. & Fisher, R. V. 1981. Towards a facies model for ignimbrite-forming eruptions. In Tephra Studies (eds. Self, S. and Sparks, R. S. J.), pp. 433–9. The Netherlands: D. Reidel Publishing Company.CrossRefGoogle Scholar
Yokoyama, S. 1974. Mode of movement and emplacement of Ito pyroclastic flow from Aira Caldera, Japan. Science Reports of the Tokyo Kyoiku Daigaku Section C 12, 17–62.Google Scholar