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Formation of olivine pseudo-crescumulates by syntectonic axial planar growth during mantle deformation

Published online by Cambridge University Press:  01 May 2009

F. G. Christiansen  and
S. Roberts
F. G. Christiansen
Affiliation:
Department of Geology, University of Aarhus, DK-8000, Denmark
S. Roberts
Affiliation:
Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK6 7AA, U.K.
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Abstract

Large elongated euhedral olivines, resembling olivines appearing in crescumulates, from dunite bodies of ophiolite mantle sequences have been subjected to a detailed structural and fabric study. Localities from the Semail Ophiolite, Oman and the Vourinos Complex, Greece are described. The studies indicate that the regional mantle flow structures control the shape and crystallographic orientation of the large euhedral olivines, which are elongated parallel to [001] and flattened parallel to (100) due to syntectonic high temperature metamorphic growth. The growth is controlled by the deformation such that grains oriented unsuitable for slip are growing whereas grains with other orientations are selectively deformed. This being so there may be more than one interpretation of crescumulate textures developed in environments that have suffered a penetrative deformation.

Type
Articles
Information
Geological Magazine , Volume 123 , Issue 1 , January 1986 , pp. 73 - 79
Copyright
Copyright © Cambridge University Press 1986

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References

Auge, T. & Roberts, S. 1982. Petrology and geochemistry of some chromitiferous bodies with the Oman ophiolite. Ofioliti, 7 133–54.Google Scholar
Boudier, F. & Coleman, R. G. 1981. Cross section through the peridotite in the Semail ophiolite, southeastern Oman mountains. Journal of Geophysical Research 86B, 2573–92.CrossRefGoogle Scholar
Brothers, R. N. 1964. Petrofabric analyses of Rhum and Skaergaard layered rocks. Journal of Petrology 5, 255–74.CrossRefGoogle Scholar
Brown, G. M. 1956. The layered ultrabasic rocks of Rhum, Inner Hebrides. Philosophical Transactions of the Royal Society of London 240B, 1–53.Google Scholar
Brown, M. 1980. Textural and geochemical evidence for the origin of some chromite deposits in the Oman ophiolite. In Ophiolites (ed. Panayiotou, A.), pp. 714–21. Proceedings of the International Ophiolite Symposium, Cyprus 1979.Google Scholar
Buiskool Toxopeus, J. M. A. 1977. Fabric development of olivine in a periodite mylonite. Tectonophysics 39, 55–72.CrossRefGoogle Scholar
Burgath, K. P. & Weiser, T. 1980. Primary features and genesis of Greek podiform chromite deposits. In Ophiolites (ed. Panayiotou, A.), pp. 675–90. Proceedings of the International Ophiolite Symposium, Cyprus 1979.Google Scholar
Carter, N. L. & Ave Lallement, H. G. 1970. High temperature flow of dunite and periodite. Geological Society of America Bulletin 81, 2181–202.CrossRefGoogle Scholar
Christiansen, F. G. 1982. Structural analysis of some ophiolitic chromitites in Sultanate of Oman. Ofioliti 7, 221–30.Google Scholar
Christiansen, F. G. 1985. Deformation fabric and micro-structures in ophiolitic chromitites and host ultramafics, Sultanate of Oman. Geologische Rundschau 74, 61–76.CrossRefGoogle Scholar
Cordellier, F., Boudier, F. & Boullier, A. M. 1981. Structural study of the Almklovdalen peridotite massif (southern Norway). Tectonophysics 77, 257–81.CrossRefGoogle Scholar
Deer, W. A., Howie, R. A. & Zussman, J. 1982. Rock Forming Minerals. Volume 1 A. Orthosilicates, 2nd ed. London, New York: Longman.Google Scholar
Donaldson, C. H. 1974. Olivine crystal types in harrisitic rocks of the Rhum pluton and in Archean spinifex rocks. Geological Society of America Bulletin 85, 1721–6.2.0.CO;2>CrossRefGoogle Scholar
Donaldson, C. H. 1976. An experimental investigation of olivine morphology. Contributions to Mineralogy and Petrology 57, 187–213.CrossRefGoogle Scholar
Drever, H. I. & Johnston, R. 1957. Crystal growth of forsteritic olivine in magmas and melts. Transactions of the Royal Society of Edinburgh 63, 289–315.CrossRefGoogle Scholar
Emmons, R. C. 1943. The Universal Stage. Geological Society of America Memoir no. 8.Google Scholar
Evans, B. W. & Trommsdorff, V. 1974. On elongate olivine of metamorphic origin. Geology 2, 131–2.2.0.CO;2>CrossRefGoogle Scholar
Gueguen, Y. & Nicolas, A. 1980. Deformation of mantle rocks. Annual Review of Earth and Planetary Science 8, 119–44.CrossRefGoogle Scholar
Hietanen, A. 1977. Blades of olivine in ultramafic rocks from Northern Sierra Nevada, California. Journal of Research of the United States Geological Survey 5, 217–19.Google Scholar
Jackson, E. D. 1961. Primary textures and mineral associations in the ultramafic zone of the Stillwater complex, Montana. United States Geological Survey Professional Paper no. 358.CrossRefGoogle Scholar
Jackson, E. D., Green, H. W. & Moores, E. M. 1975. The Vourinos ophiolite, Greece: cyclic units of lineated cumulates overlying harzburgite tectonite. Geological Society of America Bulletin 86, 390–8.2.0.CO;2>CrossRefGoogle Scholar
Menzies, M. & Allan, C. 1974. Plagioclase Iherzolite-residual mantle relationships within two Eastern Mediterranean ophiolites. Contributions to Mineralogy and Petrology 45, 197–213.CrossRefGoogle Scholar
Mockel, J. R. 1969. Structural petrology of the garnet-peridotite of Alpe Arami (Ticino, Switzerland). Leidsche Geologische Mededelingen 42, 61–130.Google Scholar
Moores, E. M. 1969. Petrology and structure of the Vourinos ophiolitic complex, Northern Greece. Geological Society of America Special Paper no. 118.CrossRefGoogle Scholar
Nicolas, A. & Poirier, J. P. 1976. Crystalline Plasticity and Solid State Flow in Metamorphic Rocks. London: John Wiley.Google Scholar
Poirier, J. P. & Nicolas, A. 1975. Deformation-induced recrystallization by progressive misorientation of sub-grain boundaries, with special reference to mantle peridotites. Journal of Geology 83, 707–20.CrossRefGoogle Scholar
Ross, J. V., Mercier, J. C., Ave Lallement, H. G., Carter, N. L. & Zimmerman, J. 1980. The Vourinos ophiolite complex, Greece: the tectonite suite. Tectonophysics 70, 63–84.CrossRefGoogle Scholar
Rothstein, A. T. V. 1971. A primary igneous texture from the Lizard peridotite, Cornwall. Geological Magazine 108, 393–8.CrossRefGoogle Scholar
Rothstein, A. T. V. 1977. The distribution and origin of primary textures in the Lizard peridotite, Cornwall. Proceedings of the Geologists' Association 88, 93–105.CrossRefGoogle Scholar
Rothstein, A. T. V. 1981. The primary crescumulates of the Lizard peridotite, Cornwall. Geological Magazine 118, 491–500.CrossRefGoogle Scholar
Smewing, J. D., Christiansen, N. I., Bartholomew, I. D. & Browning, P. 1984. The structure of the upper mantle and lower crust as deduced from the northern section of the Oman ophiolite. In Ophiolites and Oceanic Lithosphere (ed. Gass, I. G., Lippard, S. J. and Shelton, A. W.), pp. 41–53. Geological Society of London Special Publication no. 13.Google Scholar
Snoke, A. W. & Calk, L. C. 1978. Jackstraw-textured talc–olivine rocks, Preston area, Klamath mountains, California. Geological Society of America Bulletin 89, 223–30.2.0.CO;2>CrossRefGoogle Scholar
Thayer, T. P. 1969. Gravity differentiation and magmatic replacement of podiform chromite deposits. Economic Geology Monograph 4, 132–46.Google Scholar
Wadsworth, W. J. 1961. The layered ultrabasic rocks of south-west Rhum, Inner Hebrides. Philosophical Transactions of the Royal Society of London 244B, 21–64.Google Scholar