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  • 1
    Electronic Resource
    Electronic Resource
    Planar OH-bearing defects in mantle olivine (1987)
    [s.l.] : Nature Publishing Group
    Nature 328 (1987), S. 143-145 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Several single crystals of olivine, millimetres in size, were collected from a kimberlite in Buell Park, Arizona, USA. The petrographic features of this kimberlite are rather similar to the type kimberlites found in South Africa and Lesotho, although phlogopite and diamond are absent in the former ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/328143a0
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  • 2
    Electronic Resource
    Electronic Resource
    Formation mechanism of pigeonite lamellae in skaergaard augite (1979)
    Springer
    Physics and chemistry of minerals 4 (1979), S. 361-371 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Fine textures of exsolution lamellae and interface boundaries between augite and pigeonite in augite crystals from Skaergaard ferrogabbro 4430 have been studied by high resolution electron microscopy and X-ray methods. Thick pigeonite lamellae have higher densities of (100) stacking faults than thin lamellae. The displacement vector of the faults has been determined as 5/6c from the measured density of faults and the relative rotation of the augite and pigeonite lattices. The augite and pigeonite lattices are apparently coherent, and no growth ledges were observed at the interfaces. The stacking faults are often combined with the antiphase boundary of pigeonite resulting in a total displacement vector of 1/2(a+b)+5/6c. The observation of thick and thin pigeonite lamellae indicated that the thickening of (001) pigeonite lamellae was controlled by coherency strains accumulated at the interfaces between augite and pigeonite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307537
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  • 3
    Electronic Resource
    Electronic Resource
    Electron microscopy of clinoenstatite from a boninite and a chondrite (1983)
    Springer
    Physics and chemistry of minerals 9 (1983), S. 192-196 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Clinoenstatite crystals from a boninite and the Yamato-74191 chondrite have been studied with an analytical electron microscope. (100) twins and cracks perpendicular and parallel to the c axis are characteristic of their submicroscopic textures. The frequency in appearance along the c axis and widths of the cracks have been explained by the dimensional change of the c axis in the direct transformation of protoenstatite to clinoenstatite and by the cooling rate around the transformation temperature. The cracks in the crystals from the boninite are filled with fibrous crystals of talc, while those from the chondrite are open or filled with glass in which fine crystals of plagioclase are common.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00311954
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  • 4
    Electronic Resource
    Electronic Resource
    A study of subsolidus relations of the Skaergaard pyroxenes by analytical electron microscopy (1978)
    Springer
    Contributions to mineralogy and petrology 67 (1978), S. 111-117 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Within augite and pigeonite grains of the Skaergaard ferrogabbro 4430, the Ca-poor phases contain only three mole percent of CaSiO3, and the Mg-Fe partition coefficients between the Ca-poor and Ca-rich phases are extremely small with 0.46 for augite and 0.51 for pigeonite grains. These values indicate existence of diffusion within each grain (intragranular diffusion) at considerably low temperatures. The compositions are slightly but definitely different between the Ca-rich phases in augite and pigeonite grains as well as between the Ca-poor phases in augite and pigeonite grains. This indicates that the diffusion among the grains (inter-granular diffusion) has not taken place under the subsolidus condition of the Skaergaard intrusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046569
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  • 5
    Electronic Resource
    Electronic Resource
    Distribution of titanium atoms in oxy-kaersutite (1975)
    Springer
    Contributions to mineralogy and petrology 51 (1975), S. 167-172 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The distribution of Ti atoms in oxy-kaersutite has been studied by the neutron diffraction method. The cation distribution over the three octahedral sites determined by the x-ray method (Kitamura and Tokonami, 1971) is as follows; M1∶0.40MG+0.60 FE, M2∶0.75 MG+0.25 FE, M3∶0.50 MG+0.50 FE, where MG and FE represent (Mg+Al) and (Fe+Ti), respectively. The neutron diffraction study indicates that Ti atoms are enriched in the M1 site more than M2 and M3 sites as follows; M1∶0.40 MG+0.33 Fe+0.27 Ti, M2∶ 0.75 MG+0.23 Fe+0.02 Ti, M3∶0.50 MG+0.46 Fe+0.04 Ti. This distribution agrees with the result based on the Madelung energy of oxy-kaersutite by Whittaker (1972).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00372077
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  • 6
    Electronic Resource
    Electronic Resource
    The superstructure of plagioclase feldspars (1977)
    Springer
    Physics and chemistry of minerals 1 (1977), S. 199-212 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract A modulation function representing the position and density of (Na, Ca) atoms in the superstructure of the e-plagioclase has been derived from the average structures of different plagioclase and a general modulation theory. Based on this function the superstructure of bytownite (An73) has been studied with the single crystal X-ray method. The cell dimensions by Megaw's axes are a=7.946(3)A, b=67.09(2)A, c=12.236(4)A, α=39.03(1)°, β=45.63(1)° and γ=59.63(1)°. Z=18(Na, Ca) Al(Al, Si)Si2O8. The initial phase factor of the modulation function for bytownite has been obtained from the intensity data of the satellite reflections. This modulation function indicates a coherent small-scale alternation of the Na-rich and Ca-rich bands in the superstructure. This superstructure has been refined by applying the albite and anorthite structures to the Na-rich and Ca-rich bands, respectively. The change of the superstructure of the e-plagioclase due to the compositional change has been described based on the movements of the satellites in reciprocal space. The direction of the coherent small-scale intergrowth of the anorthite-like and albite-like bands is perpendicular to the t vector. The thickness of the intergrowth is 1/|t|. Both direction and thickness change regularly from An75 to An25.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307318
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  • 7
    Electronic Resource
    Electronic Resource
    The superstructure of plagioclase feldspars (1977)
    Springer
    Physics and chemistry of minerals 1 (1977), S. 213-225 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The lattice imaging technique of high resolution electron microscopy has been applied on anorthite (An96) and labradorite (An52) to examine their antiphase boundaries (APBs) and superstructure relations. The effects of the structure details and superstructure relations on the lattice images change with the thickness of the specimens. The lattice images of the areas with the usual thickness (〉150 Å) generally represent not the structure details but the superstructure relations. In anorthite the type b-APBs are rather sharp and narrow with the displacement vector of 1/2[110]An. The type c-APBs have the displacement vector of 1/2[111]An. The existence of the I $$\bar 1$$ phase in the P $$\bar 1$$ matrix is not observed for both types in this study. In labradorite, the superstructure is coherent small-scale intergrowth of the anorthite-like and albite-like bands with the interval of 30 Å corresponding to the t vector of the e 1-e 1 pairs. The thickness of both bands in the lattice images indicates that the anorthite-like and albite-like regions have approximate compositions of An80 and An5, respectively. The ordered arrangement of the subcells in each anorthite-like band, due to the reversal arrangement of Si and Al in the tetrahedral sites, is in antiphase relation with the next anorthite-like band separated by an albite-like band, resulting in a periodic antiphase structure. The type b-APBs in anorthite and the periodic APBs in labradorite are characterized with the displacement vector R=1/2[110]An=b 0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307319
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