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• W2334491548 abstract "Investigation of the liquidus phase relations in the forsterite–diopside–enstatite system has been made at 7 GPa and variable temperatures under anhydrous condition using a Walker-type multi-anvil high pressure apparatus. A total of 16 compositions were synthesized to facilitate study of this system. Location of the piercing point on the forsterite–diopside bounding join has been established at Fo 39 Di 61 (all compositions are in wt.%) and 1980 ± 20 °C. Electron microprobe analyses of the phases indicate that forsterite ss can incorporate about 1 to 1.5 wt.% monticellite (CaMgSiO 4 ) in solid solution. In the diopside–enstatite join, a temperature minimum occurs at Di 66 En 34 and 1975 ± 30 °C, whereas the peritectic point, where orthopyroxene ss reacts with liquid to form clinopyroxene ss , occurs at En 65 Di 35 and 2010 ± 20 °C. The maximum amount of MgSiO 3 that can be incorporated in diopside ss has been measured to be about 82 wt.%. Because of the increase in the solid solution proportion of MgSiO 3 in diopside ss compared to that at 2 and 5.1 GPa, the peritectic point in the diopside–enstatite bounding join also shifts further toward the enstatite apex. In the ternary system, the invariant point has been located at Fo 54 Di 35 Q 11 and 2010 ± 30 °C, where orthopyroxene ss + forsterite ss + liquid ↔ clinopyroxene ss + forsterite ss + liquid occurs. Our present study confirms that the primary phase field of forsterite shrinks and that of clinopyroxene expands further in comparison to that observed at 2 and 5.1 GPa. Preliminary experimental results from composition Fo 80 Di 12 Qtz 8 with 4 wt.% Al 2 O 3 indicate that garnet (Pyrope 98 Grossularite 2 ) and forsterite (with 0.31 wt.% monticellite) are the liquidus phases, followed by clinopyroxene (Al 2 O 3 contents between 3.4 to 2.7 wt.%). At 1970 °C , the average composition of the liquids obtained through electron microprobe analysis was as follows: SiO 2 49.81, MgO 34.72, CaO 7.29, and Al 2 O 3 6.75 wt.%, which is somewhat similar to a komatiitic melt. When projected onto the forsterite–diopside–enstatite plane this liquid composition plots very close to our cotectic line. Taking model mantle composition of a garnet peridotite, a shift in the compositional path of the residual mantle materials has been determined after extraction of the volume percent of the melt using the Lever rule." @default.
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• W2334491548 date "2012-10-01" @default.
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• W2334491548 title "THE FORSTERITE-DIOPSIDE-SILICA SYSTEM AT 7 GPA AND ITS SIGNIFICANCE IN THE MELTING BEHAVIOR OF THE MANTLE" @default.
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• W2334491548 doi "https://doi.org/10.3749/canmin.50.5.1243" @default.
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