An experimental investigation of the pyroxene-garnet transformation in a pyrolite composition and its bearing on the constitution of the mantle
作者： Tetsuo Irifune
DOI: 10.1016/0031-9201(87)90040-9
关键词: Mantle (geology) 、 Pyrolite 、 Velocity gradient 、 Specific gravity 、 Pyroxene 、 Geology 、 Majorite 、 Mineralogy 、 Seismic velocity 、 Chemical heterogeneity
摘要: Abstract The pyroxene-garnet transformation in a model pyrolite composition has been investigated over the pressure interval 4.0 to 17.5 GPa at temperatures of 1200–1400°C. is largely completed 14–16 GPa, and single phase aluminum-deficient garnet (majorite) becomes stable above 16 GPa. mineral assemblages density seismic velocity distributions for are calculated as function depth on basis this other recent experimental data. Density profiles consistent with models based observations 550 km. If existence high density/velocity gradient between km 650 confirmed, presence further transformations majorite and/or some degree chemical heterogeneity would be indicated.
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