Matches in SemOpenAlex for { <https://semopenalex.org/work/W2007556035> ?p ?o ?g. }
- W2007556035 endingPage "187" @default.
- W2007556035 startingPage "161" @default.
- W2007556035 abstract "Advances, during the Upper Mantle Project, in investigations on phase equilibria and elastic properties of the mantle minerals in the MgO-FeO-SiO2 system are reviewed. The experimental procedure for a phase equilibrium study is described. Some advantages and disadvantages of various high-pressure, high-temperature apparatus are discussed. Necessities of establishing a pressure calibration method at high temperatures are also pointed out. A brief description on a method, recently developed for the measurements of ultrasonic wave velocities of very small samples, is given. Olivine-spinel solid solution equilibria in the system Mg2SiO4-Fe2SiO4 have been studied at several laboratories over the pressure range 40–200 kbar at 800 and 1,000°C. Ringwood and Major first discovered a peculiar mode of the high-pressure transformation in compositions close to pure Mg2SiO4, resulting from the formation of β phase. Crystal structure of the β phase was clarified as modified spinel structure through a series of studies on the high-pressure transformation of Co2SiO4 and Mn2GeO4. The appearance of the modified spinel phase in the Mg2SiO4-Fe2SiO4 system was confirmed in further investigations at the author's laboratory. The isothermal section of the phase diagram for the Mg2SiO4-Fe2SiO4 system was constructed at 800 and 1,000°C on the basis of these recent experimental results. At 800°C a continuous series of spinel solid solutions was synthesizable from Fe2SiO4 to (Mg0.9Fe0.1)2SiO4. At 1,000°C, however, all the attempts to synthesize a true spinel phase of (Mg0.9Fe0.1)2SiO4 were unsuccessful up to about 140 kbar and coexistence of the modified spinel phase with true spinel was usually identified. This suggests that the stability field of the β(Mg, Fe)2 SiO4 is highly temperature dependent. A remarkable expansion of the β(Mg, Fe)2SiO4 region is expected at the higher temperatures. Based on the cell parameters of βMg2SiO4 and the extrapolated value for γMg2SiO4 (true spinel), the density increase associated with forsterite- βMg2 SiO4 transformation, and forsterite — γMg2 SiO4 transformation was calculated to be 7.9% and 10.8% respectively. Experimental data on the phase equilibria of the MgSiO3-FeSiO3 system are presented. A highpressure disproportionation of clino-pyroxene solid solutions into stishovite plus spinel solid solutions was found. It was established that the disproportionation curve for clino-ferrosilite (FeSiO3) was well represented by the boundary curve for the coesite-stishovite transformation. A preliminary phase diagram for the MgSiO3-FeSiO3 system was constructed at 800 and 1,000°C from the data by Ringwood and Major and by the author's laboratory. Experimental data on the high-pressure phase transformations of SiO2 are summarized. The boundary curve for the coesite-stishovite transformation was determined over the temperature range 550–1,200°C in the pressure range 83–101 kbar by means of a tetrahedral anvil press. The transition curve was fitted by the linear relation P(kbar) = 67 + 0.028 T(°C). This determination was found to be in reasonable agreement with the previous data. A stoichiometric compound, Fe1,000O, was synthesized at high-pressures above 40 kbar at 775°C by a reaction between wüstite, Fe0.950O, and metallic iron. The cell dimension of Fe1,000O was determined to be 4.323 ± 0.001 Å. Compressional- and shear-wave velocities of the synthetic (Mg, Fe)2 SiO4 olivine, Fe2SiO4 spinel, (Mg, Fe)SiO3 orthopyroxene, eoesite, stishovite and Fe0.98O were measured by means of the ultra-sonic pulse transmission method. Results are represented on Birch's diagram, where the wave velocities are plotted as a function of density. It was found that the wave velocities of these ferromagnesian silicates and oxide decrease linearly with the increase of the FeO/(FeO+MgO) ratio, and that the isomorphic lines of (Mg, Fe)2 SiO4 olivine, (Mg, Fe)SiO3 orthopyroxene and (Mg, Fe)O magnesiowüstite are approximately parallel to each other. The Compressional- and shear-wave velocities of the true spinel phase of Mg2 SiO4 were estimated to be 10.0 km/sec and 5.7 km/sec respectively. Compressional- and shear-wave velocities of stishovite were determined to be 11.0 km/sec and 5.55 km/sec. The bulk modulus of stishovite was calculated from these values to be 3.43 Mbar. Compressional-wave velocity of the three polymorphs of silica, αquartz, coesite and stishovite, was found to increase regularly along Birch's mean atomic weight line of M = 21." @default.
- W2007556035 created "2016-06-24" @default.
- W2007556035 creator A5005359413 @default.
- W2007556035 date "1972-04-01" @default.
- W2007556035 modified "2023-10-03" @default.
- W2007556035 title "The system MgO-FeO-SiO2 at high pressures and temperatures — phase equilibria and elastic properties" @default.
- W2007556035 cites W1516063762 @default.
- W2007556035 cites W1595821987 @default.
- W2007556035 cites W1663459404 @default.
- W2007556035 cites W1844130322 @default.
- W2007556035 cites W1964314630 @default.
- W2007556035 cites W1968629228 @default.
- W2007556035 cites W1969335602 @default.
- W2007556035 cites W1970375366 @default.
- W2007556035 cites W1972354037 @default.
- W2007556035 cites W1972556634 @default.
- W2007556035 cites W1973596088 @default.
- W2007556035 cites W1974758299 @default.
- W2007556035 cites W1977215607 @default.
- W2007556035 cites W1977984382 @default.
- W2007556035 cites W1979660148 @default.
- W2007556035 cites W1979673395 @default.
- W2007556035 cites W1985521311 @default.
- W2007556035 cites W1987277311 @default.
- W2007556035 cites W1988828141 @default.
- W2007556035 cites W1990830605 @default.
- W2007556035 cites W1992418115 @default.
- W2007556035 cites W1994554700 @default.
- W2007556035 cites W1995428583 @default.
- W2007556035 cites W1997486062 @default.
- W2007556035 cites W1998304540 @default.
- W2007556035 cites W2002199649 @default.
- W2007556035 cites W2009227872 @default.
- W2007556035 cites W2020385228 @default.
- W2007556035 cites W2023618013 @default.
- W2007556035 cites W2030819358 @default.
- W2007556035 cites W2031483861 @default.
- W2007556035 cites W2032771883 @default.
- W2007556035 cites W2033024646 @default.
- W2007556035 cites W2035730164 @default.
- W2007556035 cites W2037679773 @default.
- W2007556035 cites W2040357103 @default.
- W2007556035 cites W2050950717 @default.
- W2007556035 cites W2050969796 @default.
- W2007556035 cites W2055272486 @default.
- W2007556035 cites W2057155205 @default.
- W2007556035 cites W2058082774 @default.
- W2007556035 cites W2061860126 @default.
- W2007556035 cites W2066070963 @default.
- W2007556035 cites W2069477573 @default.
- W2007556035 cites W2071123824 @default.
- W2007556035 cites W2073040485 @default.
- W2007556035 cites W2075685970 @default.
- W2007556035 cites W2076518203 @default.
- W2007556035 cites W2078279441 @default.
- W2007556035 cites W2079397768 @default.
- W2007556035 cites W2079768324 @default.
- W2007556035 cites W2081874948 @default.
- W2007556035 cites W2082745170 @default.
- W2007556035 cites W2083939221 @default.
- W2007556035 cites W2086414351 @default.
- W2007556035 cites W2087983709 @default.
- W2007556035 cites W2090794395 @default.
- W2007556035 cites W2095327627 @default.
- W2007556035 cites W2122123277 @default.
- W2007556035 cites W2129141184 @default.
- W2007556035 cites W2132955687 @default.
- W2007556035 cites W2144314419 @default.
- W2007556035 cites W2145574458 @default.
- W2007556035 cites W2160483408 @default.
- W2007556035 cites W2163977272 @default.
- W2007556035 cites W2166026905 @default.
- W2007556035 cites W2316708021 @default.
- W2007556035 cites W2988069831 @default.
- W2007556035 cites W4234926460 @default.
- W2007556035 cites W4238823427 @default.
- W2007556035 doi "https://doi.org/10.1016/0040-1951(72)90019-4" @default.
- W2007556035 hasPublicationYear "1972" @default.
- W2007556035 type Work @default.
- W2007556035 sameAs 2007556035 @default.
- W2007556035 citedByCount "217" @default.
- W2007556035 countsByYear W20075560352012 @default.
- W2007556035 countsByYear W20075560352013 @default.
- W2007556035 countsByYear W20075560352015 @default.
- W2007556035 countsByYear W20075560352016 @default.
- W2007556035 countsByYear W20075560352017 @default.
- W2007556035 countsByYear W20075560352018 @default.
- W2007556035 countsByYear W20075560352021 @default.
- W2007556035 countsByYear W20075560352022 @default.
- W2007556035 countsByYear W20075560352023 @default.
- W2007556035 crossrefType "journal-article" @default.
- W2007556035 hasAuthorship W2007556035A5005359413 @default.
- W2007556035 hasConcept C113196181 @default.
- W2007556035 hasConcept C121332964 @default.
- W2007556035 hasConcept C127313418 @default.
- W2007556035 hasConcept C133347239 @default.
- W2007556035 hasConcept C138999460 @default.
- W2007556035 hasConcept C151730666 @default.