Abstract
Transmission electron microscopy was used for characterizing the defect microstructure induced by shock experiments in a single crystal of diopside. The shock-induced defects found in the crystal can be divided in four distinct types:
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1)
A high density and pervasive distribution of dislocations in glide configuration (glide systems (100)[0
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2)
Mechanical twin lamellae, mostly parallel to (100), the (001) twin lamellae are less abundant. li]3)
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4)
Heterogeneously distributed tiny molten zones (3 to 20 μm size) which, after cooling, appear as a glass with a chemical composition very close to the one of the original diopside.
The present TEM study reveals that the defect micro-structure in shocked diopside consists of a large variety of shock-induced defects. Especially, the amorphous PDFs which were never observed in statically deformed diopside seem to be an important characteristic micro-structural defects in shocked silicate minerals. Although the presence of amorphous PDFs is not yet confirmed for naturally shocked clinopyroxene, we strongly suggest that these features can serve as a diagnostic tool for recognizing impact phenomena on all planetary bodies of our solar system.
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Ashworth JR (1980) Deformation mechanisms in mildly shocked chondritic diopside. Meteoritics 15:105–115
Ashworth JR (1985) Transmission electron microscopy of L-group chondrites, I: Natural shock effects. Earth Planet Sci Lett 73:17–32
Ashworth JR, Barber DJ (1975a) Electron petrography of shock-deformed olivine in stony meteorites. Earth Planet Sci Lett 27:43–50
Ashworth JR, Barber DJ (1975b) Electron petrography of shock effects in a gas-rich enstatite-achondrite. Contrib Mineral Petrol 49:149–162
Ashworth JR, Barber DJ (1977) Electron microscopy of some stony meteorites. Phil Trans R Soc Lond A 286:493–506
Ashworth JR, Schneider H (1985) Deformation and transformation in experimentally shock-loaded quartz. Phys Chem Minerals 11:241–249
Christie JM, Ardell AJ (1976) Deformation structures in minerals. In: Electron Microscopy in Mineralogy (HR Wenk ed) Springer-Verlag, New York, pp 374–403
Coe R, Kirby SH (1975) The orthoenstatite to clinoenstatite transformation mechanism by shearing and its reversion by annealing: mechanism and potential applications. Contrib Mineral Petrol 52:29–55
Dodd RT, Jarosewich E (1979) Incipient melting in and shock classification of L-group chondrites. Earth Planet Sci Lett 44:335–340
Doukhan JC, Doukhan N, Nazé L, Van Duysen JC (1986) Défauts de réseau et plasticité cristalline dans les pyroxènes: une revue. Bull Minéral 109:377–394
Goltrant O, Cordier P, Doukhan JC (1991) Planar deformation features in shocked quartz; a transmission electron microscopy investigation. Earth Plan Sci Lett 106:103–115
Goltrant O, Leroux H, Doukhan JC, Cordier P (1992) Formation mechanisms of planar deformation features in shocked quartz. Phys Earth Planet Inter 74:219–240
Gratz A (1984) Deformation in laboratory-shocked quartz. J Non Crystal Sol 67:543–558
Gratz AJ, Tyburczy J, Christie JM, Ahrens TJ, Pongratz P (1988) Shock metamorphism of deformed quartz. Phys Chem Minerals 16:221–233
Grieve RAF, Sharpton VL, Stöffler D (1990) Shocked minerals and the K/T controversy. EOS Nov 13:1792
Hirth JP, Lothe J (1968) Theory of dislocations. McGraw Hill, pp 153–160
Hornemann U, Müller WF (1971) Shock-induced deformation twins in clinopyroxene. Neues Jahrb Mineral Monatsh 6:247–255
Ingrin J, Doukhan N, Doukhan JC (1991) High temperature deformation of diopside single crystals. II TEM investigation of the defect microstructure. J Geophys Res 96:14287–14297
Jeanloz R, Ahrens TJ, Lally JS, Nord GL, Christie JM, Heuer AH (1977) Shock-produced olivine glass: first observation. Science 197:457–459
Jeanloz R (1980) Shock effects in olivine and implications for Hugoniot data. J Geophys Res 85:3163–3176
Kieffer SW, Phakey PP, Christie JM (1976) Shock processes in porous quartzite: transmission electron microscope observations and theory. Contrib Mineral Petrol 59:41–93
Kieffer SW (1977) Impact conditions required for formation of melt by jetting in silicate. In “Impact and explosion cratering” (eds DJ Roddy, RO Pepin and RB Merrill) Pergamon Press 751–769
Kirby SH, Christie JM (1977) Mechanical twinning in diopside Ca(Mg,Fe)Si2O6: structural mechanisms and associated crystal defects. Phys Chem Minerals 1:137–163
Kirby SH (1976) The role of crystal defect in the shear-induced transformation of orthopyroxene to clinopyroxene. In: Wenk R (ed) Electron microscopy in mineralogy. Springer-Verlag, New York, pp 465–472
Klug HP, Alexander LF (1974) X-Ray diffraction procedures. J Wiley New York
Langenhorst F, Deutsch A, Stöffler D, Hornemann U (1992) Effect of temperature on shock metamorphism of single-crystal quartz. Nature 356:507–509
Liu LG (1987) New silicate perovskites. Geophys Res Letters 14:1079–1082
Medenbach O (1985) A new microdiffractometer spindle stage and its application. Fortschr Min 63:111–133
Müller WF (1993) Thermal and deformation history of the Shergotty meteorite deduced from clinopyroxene microstructure. Geochim Cosmochim Acta 57:4311–4322
Nord GL, McGree JJ (1979) Thermal and mechanical history of granulated norite and pyroxene anorthosite clasts in breccia 73255. Proc 10th Lunar Planet Sci Conf, pp 817-832
Raterron P, Jaoul O (1991) High temperature deformation of diopside single crystals. I. Mechanical data. J Geophys Res 96:14277–14286
Schaal RB (1982) Disequilibrium features in experimentally shocked mixtures of olivine plus silica glass powders. Contrib Mineral Petrol 81:39–47
Schmitt DJ, Ahrens TJ (1989) Shock temperatures in silica glass: implications for modes of shock-induced deformation, phase transformation, and melting with pressure. J Geophys Res 94:5851–5871
Schneider H, Vasudevan R, Hornemann U (1984) Deformation of experimentally shock-loaded quartz powders: X-ray line broadening studies. Phys Chem Minerals 10:142–147
Stöffler D (1972) Deformation and transformation of rock-forming minerals by natural and experimental shock process I. Behaviour of minerals under shock compression. Fortschr Mineral 49:50–113
Stöffler D, Keil K, Scott ERD (1991) Shock metamorphism of ordinary chondrites. Geochim Cosmochim Acta 55:3845–3867
Svendsen B, Ahrens TJ (1983) Dynamic compression of diopside and salite to 200 GPa. Geophys Res Letters 10:501–504
Svendsen B, Ahrens TJ (1990) Shock-induced temperature of CaMgSi2O6. J Geophys Res 95:6943–6953
Van Duysen JC, Doukhan N, Doukhan JC (1983) Room temperature microplasticity of α spodumene. Phys Chem Minerals 10:125–135
Westwood JH, Conrad H (1971) The science of hardness and its research applications. Amer Soc Metals Metals Park
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Leroux, H., Doukhan, J.C. & Langenhorst, F. Microstructural defects in experimentally shocked diopside: A TEM characterization. Phys Chem Minerals 20, 521–530 (1994). https://doi.org/10.1007/BF00211847
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DOI: https://doi.org/10.1007/BF00211847