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  • 1
    Electronic Resource
    Electronic Resource
    The post-spinel phase of forsterite (1976)
    [s.l.] : Nature Publishing Group
    Nature 262 (1976), S. 770-772 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I have previously found that forsterite transforms into an assemblage of perovskite (MgSiO2) plus periclase (MgO) when subjected to pressures 〉 3.0 x 1010 Pa and 1,000 C (ref. 4). Since the zero pressure density for the perovskite + periclase assemblage is 1.9% greater than that of the mixed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/262770a0
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  • 2
    Electronic Resource
    Electronic Resource
    Olivine to spinel transformation in Mg 2 SiO 4 via faulted structures (1983)
    [s.l.] : Nature Publishing Group
    Nature 303 (1983), S. 233-235 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The starting material consisted of synthetic olivine (Mg2SiO4 from TEM-Pres) and a minute amount of graphite. The latter was added for absorbing the laser and thus heating the sample. The starting material was compressed in a diamond-anvil cell to about 220 kbar over a 20-min period, and the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/303233a0
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  • 3
    Electronic Resource
    Electronic Resource
    Polymorphism in the solid solutions, potassium chloride-sodium chloride and rubidium chloride-potassium chloride, at high pressure (1973)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 77 (1973), S. 1695-1699 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100632a021
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  • 4
    Electronic Resource
    Electronic Resource
    A hypothesis for the seismogenesis of a double seismic zone (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 123 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The seismogenesis of a double seismic zone, in particular the lower layer of a double seismic zone, has not been adequately explained in the literature. On the basis of seismic data and geothermal structures along three well-studied cross-sections in the Kuril-Kamchatka and Japan subduction zones, we investigate the temperature/pressure conditions associated with seismogenic structures of the double seismic zones. the corresponding T/P loci seem to suggest that earthquakes observed in the lower layer and in the lower part (below approximately 130 ± 20 km) of the top layer of a double seismic zone were caused by metastable phase transition-a mechanism similar to that responsible for deep-focus earthquakes only at lower temperature/pressure conditions. Under this hypothesis, the wedge-shaped configuration of a double seismic zone is interpreted to represent the loci of the kinetic boundary of the phase transition. According to theoretical/experimental studies and the constraints imposed by our observations, a likely candidate for such a phase transition is the metastable Al-rich enstatite decomposing into the assemblage of Al-poor enstatite plus garnet. Earthquakes in the upper part of the top layer were most probably due to conventional mechanisms such as dehydration of subducted materials and/or facies change from basalt to eclogite. That the top layer involves more than one seismogenic mechanism is also implied by the distinct behaviour of seismicity in the vicinity of 130 ± 20 km. Because the presence of deviatoric stress is critical to the reaction rate of a metastable phase transition, it is inferred that single seismic zones are also caused by the same mechanisms, except that the implicit layer of a supposed double seismic zone is missing, due to the insufficient amount of appropriate metastable minerals or to the lack of appropriate deviatoric stresses in the source region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06662.x
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  • 5
    Electronic Resource
    Electronic Resource
    The causes of the major seismic discontinuities in the transition zone of the Earth's mantle (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 121 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: By modifying Uffen's approach, the relative melting-temperature gradients in the vicinity of the transition zone have been estimated. There is a thermodynamic relationship between the melting-temperature gradients at the triple point at which the melting curve is intercepted by a solid-solid phase transition. On the basis of the results of these studies, it is concluded that the 400 km seismic discontinuity in the transition zone is consistent with a phase transition possessing a positive dT/dP slope, whereas the 670 km discontinuity is found to be consistent with either a phase transition having a negative slope or a chemical change. These conclusions have been reached independently of all previous studies that used elastic and thermal properties of the mantle and of the predicted compositions for the various parts of the mantle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb05721.x
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  • 6
    Electronic Resource
    Electronic Resource
    A mineralogical Raman spectroscopy study on eclogitic garnet inclusions in diamonds from Argyle (1990)
    Springer
    Contributions to mineralogy and petrology 105 (1990), S. 156-161 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In an attempt to better define the depths of formation of eclogitic-paragenesis diamonds from the Argyle lamproite pipe, we have employed a Laser Raman microprobe to determine the Raman peak shift of a garnet inclusion (extracted from diamond) with pressure in a diamond-anvil pressure cell. On the basis of these data, we further found that the in situ garnet inclusions record near-atmospheric pressures within the limits of experimental uncertainty. Data on the compressibility and thermal expansivity of both diamond and garnet were used to define a P-T curve for the entrapment of garnet in diamond. A window within the range 47 kbar at 1100° C (150 km) to 93 kbar at 1500° C (280 km) for the formation of syngenetic garnet inclusions in diamond is defined by the intersection of the continental geotherm with the diamond-graphite boundary and the entrapment curve determined in the present study. This P-T window is consistent with the constraints imposed by other petrological studies of co-existing inclusions. Most of eclogitic-paragenesis diamonds from Argyle are estimated to have formed at a depth less than 250 km, if temperature estimates from petrological study are used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00678982
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  • 7
    Electronic Resource
    Electronic Resource
    Post-oxide phases of olivine and pyroxene and mineralogy of the mantle (1975)
    [s.l.] : Nature Publishing Group
    Nature 258 (1975), S. 510-512 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fine powder of the starting material was compressed in a diamond-anvil press fitted with a lever and spring assembly and was irradiated by a cw YAG laser while the sample was maintained under steady pressure. The quenched sample was removed to a modified 57.3 mm Debye-Scherrer camera for X-ray ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/258510a0
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  • 8
    Electronic Resource
    Electronic Resource
    Chemistry and structure of high pressure phase of garnets rich in almandite (1975)
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 213-215 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Details of the samples and experimental procedures have been described elsewhere3'4. Fine polycrystalline powder samples of synthetic almandite and natural almandite-rich garnets were compressed in a diamond anvil press fitted with a lever and spring assembly and were irradiated by a continuous ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/255213a0
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  • 9
    Electronic Resource
    Electronic Resource
    Olivine to spinel transformation in Mg 2 SiO 4 via faulted structures (1983)
    [s.l.] : Nature Publishing Group
    Nature 303 (1983), S. 233-235 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The starting material consisted of synthetic olivine (Mg2SiO4 from TEM-Pres) and a minute amount of graphite. The latter was added for absorbing the laser and thus heating the sample. The starting material was compressed in a diamond-anvil cell to about 220 kbar over a 20-min period, and the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/303233a0
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  • 10
    Electronic Resource
    Electronic Resource
    Dry ice II, a new polymorph of CO 2 (1983)
    [s.l.] : Nature Publishing Group
    Nature 303 (1983), S. 508-509 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Next to H2O, CO2 is probably the most important gaseous Species with respect to geological processes on the Earth's surface and within its interior. CO2 is also probably an important component of other planets in our Solar System (such as Venus, the outer planets and their satellites). Gaseous CO2 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/303508a0
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