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Terrestrial metamorphic clinoenstatite in kinks of bronzite crystals

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Abstract

Bronzite in a highly deformed and partially metamorphosed gabbro from Central Australia shows intensive bending and kinking. The optical properties of some kinked and deformed areas differ significantly from those of the original bronzite. Single crystal X-ray and optical investigations show that some highly strained areas of bronzite have inverted to clinoenstatite (2V=50±6°; sign +;ZΛc=32±2°). Mixed phases of both also occur. The new clinoenstatite lattice is untwinned.

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References

  • Atlas, L.: The polymorphism of MgSiO3 and solid state equilibria in the system MgSiO3-CaMgSi2O6. J. Geol.60, 125–147 (1952).

    Google Scholar 

  • Binns, R. A.: The mineralogy of metamorphosed basic rocks from the Nillyama Complex, Broken Hill district, New South Wales. Part II. Pyroxenes, garnets, plagioclases, and opaque oxides. Mineral. Mag.35, 561–587 (1965).

    Google Scholar 

  • Borg, I., andJ. Handin: Experimental deformation of crystalline rocks. Tectonophysics3, No. 4 (1966).

  • Boyd, F. R., andJ. L. England: The rhombic enstatite-clinoenstatite inversion. Carnegie Inst. Year Book64, 117–120 (1965).

    Google Scholar 

  • Brown, W. L., W. Morimoto, andJ. V. Smith: A structural explanation of the polymorphism and transitions of MgSiO3. J. Geol.69, 609–616 (1961).

    Google Scholar 

  • —, andJ. V. Smith: High-temperature X-ray studies on the polymorphism of MgSiO3. Z. Krist.118, 186–212 (1963).

    Google Scholar 

  • Dallwitz, W. B., D. H. Green, andJ. E. Thompson: Clinoenstatite in a volcanic rock from the Cape Vogel Area, Papua. J. Petrol.7, 375–403 (1966).

    Google Scholar 

  • Dodge, T. A.: The determination of optic angle with the universal stage. Am. Mineralogist19, 62–75 (1934).

    Google Scholar 

  • Griggs, D. T., F. J. Turner, andH. Heard: Deformation of rocks at 500°C and 800°C. Geol. Soc. Am. Mem.79, 39–104 (1960).

    Google Scholar 

  • Guimaraes, D.: Encore a propos de la genèse des orthopyroxenes. Estado de Minas Gerais 11, Brasil 1952.

  • -, andB. Brajnikov: Enstenitization in the Palisade sill diabase and its consequences. Estado de Minas Gerais7, Brasil 1948.

  • Hess, H. H.: Orthopyroxenes of the Bushveld type. Am. J. Sci.250, 173–187 (1952).

    Google Scholar 

  • Kuno, H.: Ion substitution in the diopside-ferropigeonite series of clinopyroxenes. Am. Mineralogist40, 70–93 (1955).

    Google Scholar 

  • Muegge, O.: Über Translationen und verwandte Erscheinungen in Krystallen. Neues Jahrb. Mineral. Geol. u. Paläontol.1, 71–158 (1898).

    Google Scholar 

  • Paterson, M. S., andL. E. Weiss: Experimental deformation and folding in phyllite. Geol. Soc. Am. Bull.77, 343–374 (1966).

    Google Scholar 

  • Pollack, S. S., andW. D. Rubble: X-ray diffraction of ordered and disordered orthoenstatite. Am. Mineralogist49, 983–992 (1964).

    Google Scholar 

  • Raleigh, C. B.: Glide mechanisms in experimentally deformed minerals. Science150, 739–741 (1965).

    Google Scholar 

  • Solar, C. B., L. C. Carrison, andC. M. Schwartz: High pressure stability fields of clinoenstatite, and the orthoenstatite-clinoenstatite transition. Trans. Am. Geophys. Union45, 121 (1964).

    Google Scholar 

  • Starkey, J.: The geometry of kink bands in crystals. Contr. Mineral. and Petrol.19, 133–141 (1968).

    Google Scholar 

  • Tröger, E.: Optische Bestimmung der gesteinsbildenden Minerale. Stuttgart: Schweizerbart 1959.

    Google Scholar 

  • Turner, F. J.: Personal communication (1968).

  • -,H. Heard, andD. T. Griggs: Experimental deformation of enstatite and accompanying inversion to clinoenstatite. Int. Geol. Congr. Norden, XXI session, part XVIII, p. 399–408 (1960).

  • —, andL. E. Weiss: Deformational kinks in brucite and gypsum. Proc. Nat. Acad. Sci. U.S. 54,2, 359–364 (1965).

    Google Scholar 

  • Weiss, L. E.: Flexural slip of foliation model material. Can. Geol. Survey (1968) (in press).

Download references

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Trommsdorff, V., Wenk, H.R. Terrestrial metamorphic clinoenstatite in kinks of bronzite crystals. Contr. Mineral. and Petrol. 19, 158–168 (1968). https://doi.org/10.1007/BF00635486

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