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- W2016202480 abstract "A temperature-composition diagram has been constructed for the system MgSiO3 FeSiO3 at 1 atm, using a combination of experimental data obtained at 1100 and 1250° and thermodynamic calculations. From the information contained in thisT-X diagram, and that provided by experimental work on theP-T stability field of orthoferrosilite, and by studies of the distribution of iron between olivine and orthopyroxene, a series ofT-X sections of the system have been calculated for pressures of 0 (× 2.5) to 15 kbars. The ferrosilite content of a metamorphic orthopyroxene coexisting with quartz and olivine increases by a constant 2.6% Fs per kbar over this pressure range, and decreases by approximately 1% for each 100° increase in temperature. TheT-X sections are thought to be sufficiently accurate to give the absolute pressure of crystallisation to within 1 kbar if the temperature of formation of an olivine-pyroxene-silica assemblage is known to ± 100°C. Application of this geobarometer to the orthopyroxenes of metamorphic rock suggests pressures of crystallisation ranging up to 8.5 kbars. Intermediate values of 3 to 5 kbars are indicated for contact metamorphosed rocks and deep-seated acid intrusions. The corresponding depths of crystallisation of orthopyroxene-bearing metamorphic rocks are 15 to 35 km ifg has remained constant. In geologically favourable circumstances the geobarometer is sufficiently accurate to permit secular variations of 10% in the universal gravitational constant (G) to be detected." @default.
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- W2016202480 date "1971-05-01" @default.
- W2016202480 modified "2023-09-25" @default.
- W2016202480 title "The orthopyroxene geobarometer" @default.
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- W2016202480 doi "https://doi.org/10.1016/0012-821x(71)90132-4" @default.
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