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Zonal schemes in ancient ignimbrites

Published online by Cambridge University Press:  01 May 2009

Brian E. Lock
Brian E. Lock
Affiliation:
Department of Geology, Rhodes University, P.O. Box 94, Grahamstown, S. Africa
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Summary

Zonal arrangements in ancient ignimbrites have usually been interpreted as a reflection of variations in welding. Detailed study of two Lower Palaeozoic ignimbrites from Newfoundland demonstrates that crystallization zones can also be recognized and that in some cases it is these zones which are responsible for the gross features of the cooling unit.

Type
Articles
Information
Geological Magazine , Volume 108 , Issue 2 , May 1971 , pp. 103 - 109
Copyright
Copyright © Cambridge University Press 1971

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References

Anderson, J. E. Jr., 1969. Development of snowflake texture in a welded tuff, Davis Mountains, Texas. Bull. geol. Soc. Am. 80, 2075–80.CrossRefGoogle Scholar
Beavon, R. V., Fitch, F. J. & Rast, N. 1961. Nomenclature and diagnostic characters of ignimbrites with reference to Snowdonia. Lpool Manchr Geol J. 2, 600–11.CrossRefGoogle Scholar
Beavon, R. V. 1963. The succession and structure east of the Glaslyn River, North Wales. Q. Jl geol. Soc. Lond. 119, 479–512.CrossRefGoogle Scholar
Bordet, P., Marinelli, G., Mittempergher, M. & Tazieff, H. 1963. Contribution a l'étude volcanologique du Katmai et de la Vallée des Dix Milles Fumées (Alaska). Mém. Soc. géol. Belge 7.Google Scholar
Boyd, F. R. 1961. Welded tuffs and flows in the rhyolite plateau of Yellowstone Park, Wyoming. Bull. geol. Soc. Am. 72, 397–426.CrossRefGoogle Scholar
Brenchley, P. J. 1964. Ordovician ignimbrites in the Berwyn Hills, North Wales: Geol. J. 4, 43–54.CrossRefGoogle Scholar
Brenchley, P. J. 1969. The relationship between vulcanicity and sedimentation in the Caradocian rocks of North Wales. In Precambrian and Lower Palaeozoic rocks of Wales, University of Wales Press.Google Scholar
Cook, E. F. 1962. Ignimbrite bibliography and review. Idaho Bureau of Mines, Geol. Info. Circ. 13.Google Scholar
Cook, E. F. 1963. Ignimbrites of the great basin, U.S.A. Bull. volcan., 25, 89–96.CrossRefGoogle Scholar
Dewey, J. F. 1963. Lower Palaeozoic stratigraphy of central Murrisk, Ireland and the evolution of the South Mayo trough. Q. Jl geol. Soc. Lond. 119, 313–44.CrossRefGoogle Scholar
Fenner, C. N. 1920. The Katmai region, Alaska, and the great eruption of 1912. J. Geol. 28, 569–606.CrossRefGoogle Scholar
Fenner, C. N. 1923. The origin and mode of emplacement of the great tuff deposits of the Valley of Ten Thousand Smokes. National geog. Soc., Contrib. Tech. Papers, Katmai Ser. 1, 74 pp.Google Scholar
Fenner, C. N. 1937. Tuffs and other volcanic deposits of Katmai and Yellowstone Park. Trans. Am. geophys. Un. 18th Ann. Mtg, 236–9.Google Scholar
Fenner, C. N. 1948. Incandescent tuff flows in Southern Peru. Bull. geol. Soc. Am. 59, 879–93.Google Scholar
Fitch, F. J. 1967. Ignimbrite volcanism in North Wales. Bull. volcan. 30, 199–219.Google Scholar
Jenks, W. F. & Goldich, S. S. 1956. Rhyolitic tuff flows in southern Peru. J. Geol. 64, 156–72.CrossRefGoogle Scholar
Lock, B. E. 1969. Silurian rocks of west White Bay, Area, Newfoundland. Mem. Am. Ass. Petrol. Geol. 12, 433–42.Google Scholar
Marshall, P. 1932. Notes on some volcanic rocks of the North Island of New Zealand. N.Z. Jl Sci. Technol. B13, 198–200.Google Scholar
Marshall, P. 1935. Acid rocks of the Taupo-Rotoroa volcanic district. Trans. R. Soc. N.Z. 64, 323–66.Google Scholar
Martin, R. C. & Lewis, J. F. 1963. Nature of glass in New Zealand ignimbrites: Nature, Lond. 197, 1166–7.Google Scholar
Noble, D.C. 1968. Laminar viscous flowage structures in ash-flow tuffs from Gran Canaria, Canary Islands; a discussion. J. Geol. 76, 721–3.Google Scholar
Rast, N. 1962. Textural evidence for the origin of ignimbrites. Lpool Manchr geol. J. 3, 97–108.CrossRefGoogle Scholar
Rast, N. 1969. The relationship between Ordovician structure and volcanicity in Wales. In Precambrian and Lower Palaeozoic rocks of Wales, University of Wales Press.Google Scholar
Rittman, A. 1958. Cenni sulle colate di ignimbrit. Catania Accad. Giornia di Sci. naturali Boll., ser. 4, 524–33.Google Scholar
Ross, C. S. & Smith, R. L. 1961. Ash-flow tuffs: their origin, geologic relations and identification. Prof. Pap. U.S. geol. Surv. 366.Google Scholar
Smith, R. L. 1960a. Zones and zonal variations in welded ash flows. Prof. Pap. U.S. geol. Surv. 354–F.Google Scholar
Smith, R. L. 1960b. Ash flows. Bull. geol. Soc. Am. 71, 795–842.CrossRefGoogle Scholar
Stanton, W. I. 1960. The Lower Palaeozoic rocks of south-west Murrisk, Ireland. Q. Jl geol. Soc. Lond. 116, 269–96.Google Scholar
Thompson, B. N., Kermode, L. O., & Ewart, A. (Eds.) 1966. New Zealand volcanology, central volcanic region. N.Z. Dept. Sci. Industrial Res. Inf. Ser. N. 50, 1.Google Scholar
Van Bemmelen, R. W. 1963. Volcanology and geology of ignimbrites in Indonesia, North Italy and the U.S.A. Bull. volcan. 25, 151–73.Google Scholar