Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-12-03T19:16:05.285Z Has data issue: false hasContentIssue false
  • English
  • Français

Textural patterns at porphyroblast margins and their use in determining the time relations of deformation and crystallization

Published online by Cambridge University Press:  01 May 2009

C. C. Ferguson  and
B. Harte
C. C. Ferguson
Affiliation:
Department of Geology, University of NottinghamNottingham, NG7 2RD
B. Harte
Affiliation:
Grant Institute of Geology, University of Edinburgh, EdinburghScotland
Get access Rights & Permissions [Opens in a new window]

Summary

Textural patterns characteristic of supposed pre-, post- and to a lesser extent syn-tectonic porphyroblasts are reviewed. Difficulties of interpretation arise where an Si (internal schistosity) is absent, and Se (external schistosity) behaviour adjacent to porphyroblast margins is the only available criterion; examples may be found showing truncation of Se by pre-Se porphyroblasts. Truncation and/or deflection textures are not by themselves sufficient criteria for determining the time relations of particular phases of deformation and crystallization.

Type
Articles
Information
Geological Magazine , Volume 112 , Issue 5 , September 1975 , pp. 467 - 480
Copyright
Copyright © Cambridge University Press 1975

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bastin, E. S. 1950. Interpretation of ore textures. Mem. Geol. Soc. Am. 45.Google Scholar
Chadwick, B. 1968. Deformation and metamorphism in the Lukmanier region, Central Switzerland. Bull. geol. Soc. Am. 79, 1123–50.CrossRefGoogle Scholar
Cloos, E. 1947. Oolite deformation in the South Mountain fold, Maryland. Bull. geol. Soc. Am. 58, 843–918.CrossRefGoogle Scholar
Durney, D. W. 1972. Solution-transfer, an important geological deformation mechanism. Nature, Lond. 235, 315–16.CrossRefGoogle Scholar
Durney, D. W. & Ramsay, J. G. 1973. Incremental strains measured by syntectonic crystal growths. In De Jong, K. A. & Scholten, R. (Eds): Gravity and Tectonics, 67–96. John Wiley & Sons Inc., New York.Google Scholar
Elliott, D. 1972. Deformation paths in structural geology. Bull. geol. Soc. Am. 83, 2621–38.CrossRefGoogle Scholar
Ferguson, C. C. & Harvey, P. K. 1972. Porphyroblasts and ‘crystallisation force’: some textural criteria: discussion. Bull. geol. Soc. Am. 83, 919–20.CrossRefGoogle Scholar
Fettes, D. J. 1971. Relation of cleavage and metamorphism in the Macduff Slates. Scott. J. Geol. 7, 248–53.CrossRefGoogle Scholar
Flinn, D. 1965. Deformation in metamorphism. In Pitcher, W. S. & Flinn, G. W.(Eds): Controls of Metamorphism, 46–72. Oliver & Boyd, Edinburgh.Google Scholar
Frankel, J. J. 1957. Abraded pyrite crystals from the Witwatersrand gold mines. Mineralog. Mag. 31, 392–401.Google Scholar
Galwey, A. K. & Jones, K. A. 1962. Inclusions in garnets. Nature, Lond. 193, 471–2.CrossRefGoogle Scholar
Ghosh, S. K. & Sengupta, S. 1973. Compression and simple shear of test models with rigid and deformable inclusions. Tectonophysics 17, 133–75.CrossRefGoogle Scholar
Harte, B. & Johnson, M. R. W. 1969. Metamorphic history of Dalradian rocks in Glens Clova, Esk and Lethnot, Angus, Scotland. Scott. J. Geol. 5, 54–80.CrossRefGoogle Scholar
Johnson, M. R. W. 1962. Relations of movement and metamorphism in Banffshire. Trans. Edin. geol. Soc. 19, 29–64.CrossRefGoogle Scholar
Mardia, K. V. 1972. Statistics of Directional Data. 357 pp. Academic Press, London.Google Scholar
Misch, P. 1971. Porphyroblasts and ‘crystallisation force’: some textural criteria. Bull. geol. Soc. Am. 82, 245–52.CrossRefGoogle Scholar
Mügge, O. 1930. Bewegungen von Porphyroblasten in Phylliten und ihre Messung. Neues Jb. Abh. 61, 469–510.Google Scholar
Mukhopadhyay, D. 1973. Strain measurements from deformed quartz grains in the slaty rocks from the Ardennes and the northern Eifel. Tectonophysics 16, 279–96.CrossRefGoogle Scholar
Offler, R. & Fleming, P. D. 1968. A synthesis of folding and metamorphism in the Mt. Lofty Ranges, South Australia. J. geol. Soc. Aust. 15 (2), 245–66.CrossRefGoogle Scholar
Pabst, A. 1931. ‘Pressure-shadows’ and the measurement of the orientation of minerals in rocks. Am. Miner. 16, 55–70.Google Scholar
Park, R. G. 1969. Structural correlation in metamorphic belts. Tectonophysics 7, 323–38.CrossRefGoogle Scholar
Pitcher, W. S. & Berger, A. R. 1972. The Geology of Donegal. 435 pp. John Wiley & Sons Inc., New York.Google Scholar
Powell, D. & Treagus, J. E. 1970. Rotational fabrics in metamorphic minerals. Mineral. Mag. 37, 801–14.CrossRefGoogle Scholar
Ramsay, J. G. 1962. The geometry and mechanics of formation of ‘similar’ type folds. J. Geol. 70, 309–27.CrossRefGoogle Scholar
Ramsay, J. G. 1967. Folding and Fracturing of Rocks. 568 pp. McGraw-Hill, New York.Google Scholar
Ramsay, J. G. & Graham, R. H. 1970. Strain variation in shear belts. Can. J. Earth Sci. 7, 786–813.CrossRefGoogle Scholar
Rast, N. 1958. Metamorphic history of the Schichallion Complex, Perthshire. Trans. R. Soc. Edin. 63, 413–31.CrossRefGoogle Scholar
Rast, N. 1965. Nucleation and growth of metamorphic minerals. In Pitcher, W. S. & Flinn, G. W. (Eds): Controls of Metamorphism, 73–102. Oliver & Boyd, Edinburgh.Google Scholar
Roberts, D. 1968. The structural and metamorphic history of the Langstrand-Finfjord area, Soroy, Northern Norway. Norg. geol. Unders. 253, 1–160Google Scholar
Roberts, J. L. 1974. The structure of the Dalradian rocks in the S.W. Highlands of Scotland. Jl geol. Soc. Lond. 130, 93–124.CrossRefGoogle Scholar
Rosenfeld, J. L. 1970. Rotated garnets in metamorphic rocks. Spec. Pap. geol. Soc. Am. 129, 1–105.Google Scholar
Sander, B. & Pernt, M. 1923. Zur petrographisch-tektonischen Analyse: I. Jb. Geol. Bundesanst. Wien 73, 183–253.Google Scholar
Sengupta, A. 1963. Preliminary results of the study of porphyroblasts from Sakoli metamorphites, Bhandara district. J. geol. Soc. India 4, 88–96.Google Scholar
Shelley, D. 1972. Porphyroblasts and ‘crystallisation force’: some textural criteria: discussion. Bull. geol. Soc. Am. 83, 919–20.CrossRefGoogle Scholar
Siddans, A. W. B. 1972. Slaty cleavage — a review of research since 1815. Earth-Sci. Rev. 8, 205–32.CrossRefGoogle Scholar
Spry, A. 1963. The chronological analysis of crystallisation and deformation of some Tasmanian Precambrian rocks. J. geol. Soc. Aust. 10, 193–208.CrossRefGoogle Scholar
Spry, A. 1969. Metamorphic Textures. 350 pp. Pergamon Press, London.Google Scholar
Spry, A. 1972. Porphyroblasts and ‘crystallisation force’: some textural criteria: discussion. Bull. geol. Soc. Am. 83, 1201–2.CrossRefGoogle Scholar
Stephansson, O. 1974. Stress-induced diffusion during folding. Tectonophysics 22, 233–51.CrossRefGoogle Scholar
Strömgard, K.-E. 1973. Stress distribution during formation of boudinage and pressure shadows. Tectonophysics 16, 215–48.CrossRefGoogle Scholar
Sturt, B. A. & Harris, A. L. 1961. The metamorphic history of the Loch Tummel area, central Perthshire, Scotland. Lpool Manchr geol. J. 2, 689–711.CrossRefGoogle Scholar
Wickham, J. S. 1973. An estimate of strain increments in a naturally deformed carbonate rock. Am. J. Sci. 273, 23–47.CrossRefGoogle Scholar
Williams, P. F. 1972(a). Development of metamorphic layering and cleavage in low grade metamorphic rock at Bermagui, Australia. Am. J. Sci. 272, 1–47.CrossRefGoogle Scholar
Williams, P. F. 1972(b). ‘Pressure shadow’ structures in foliated rocks from Bermagui, New South Wales. J. geol. Soc. Aust. 18, 371–7.CrossRefGoogle Scholar
Wilson, M. R. 1971. On syntectonic porphyroblast growth. Tectonophysics 11, 239–60.CrossRefGoogle Scholar
Zwart, H. J. 1960(a). The chronological succession of folding and metamorphism in the Central Pyrenees. Geol. Rdsch. 50, 203–18.CrossRefGoogle Scholar
Zwart, H. J. 1960(b). Relations between folding and metamorphism in the Central Pyrenees, and their chronological succession. Geol. Mijnb. 39, 163–80.Google Scholar
Zwart, H. J. 1962. On the determination of polymetamorphic mineral associations and its application to the Bosost area (Central Pyrenees). Geol. Rdsch. 52, 38–65.CrossRefGoogle Scholar
Zwart, H. J. 1963. Metamorphic history of the Central Pyrenees. II. Valle de Aran. Leidse Geol. Meded. 28, 321–76.Google Scholar