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Garnet-clinopyroxene geothermometer
Contributions to Mineralogy and Petrology, 1979A garnet-clinopyroxene geothermometer based on the available experimental data on compositions of coexisting phases in the system MgO-FeO-MnO-Al2O3-Na2O-SiO2 is as follows: $$T({\text{}}K) = \frac{{8288 + 0.0276 P {\text{(bar)}} + Q1 - Q2}}{{1.987 \ln K_{\text{D}} + 2.4083}}$$
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Clinopyroxenes in Kimberlites of China
Acta Geologica Sinica - English Edition, 1992Abstract The author studied the grain size, shape, colour, altered coat, mineral species, chemical composition, end‐ member components and infrared spectra of clinopyroxenes occurring as megacryst, macrocryst and groundmass minerals, intergrowths with pyrope and ilmenite and minerals in deep‐seated xenoliths and inclusions in diamonds in kimberlites of
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Elasticity of an upper mantle clinopyroxene
Physics and Chemistry of Minerals, 1998The ambient pressure elastic properties of a natural clinopyroxene (C2/c symmetry) from Kilbourne Hole, NM have been determined. In terms of end-members, diopside (CaMgSi2O6), hedenbergite (CaFeSi2O6), jadeite (NaAlSi2O6), cosmochlor (NaCrSi2O6), and Mg-Tschermak (MgAl(AlSi)O6), its composition is Di72He9Jd3Cr3Ts12.
J. M. Brown, M. D. Collins
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Assessment of the Garnet-Clinopyroxene Thermometer
International Geology Review, 1998A thermometer based on the MgFe−1 exchange equilibrium between garnet and clinopyroxene is formulated by using new experimental data measured at 600° to 950°C, 0.8 to 3.0 GPa, and f(O2) defined by the fayalite-quartz-magnetite buffer in the basalt-H2O system. The new formulation is T = 3820 / 1.828 + lnKD (1 + a(2.2 − p)), where T is temperature (K), P
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Physics and Chemistry of Minerals, 2013
High-pressure single-crystal X-ray diffraction measurements of synthetic LiCrSi2O6 clinopyroxene (with space group P21/c) were performed in a diamond-anvil cell up to 7.970 GPa. No phase transition has been observed within the pressure range investigated, but the elastic behavior at lower pressures (up to ~2.5 GPa) is affected by an anomalous softening
Benedetta Periotto +7 more
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High-pressure single-crystal X-ray diffraction measurements of synthetic LiCrSi2O6 clinopyroxene (with space group P21/c) were performed in a diamond-anvil cell up to 7.970 GPa. No phase transition has been observed within the pressure range investigated, but the elastic behavior at lower pressures (up to ~2.5 GPa) is affected by an anomalous softening
Benedetta Periotto +7 more
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Simulated garnet-clinopyroxene geothermometry of eclogites
Contributions to Mineralogy and Petrology, 1999The Fe-Mg thermometer widely used to infer the “equilibration” temperature of garnet-clinopyroxene assemblages of eclogites records the progressive blocking of diffusion-limited exchanges between coexisting mineral phases. It is argued that equilibrium is achieved through the fast grain boundary model in which Fe and Mg circulate in an interstitial ...
Stéphanie Duchêne, Francis Albarède
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Clinopyroxene from Brazilian kamafugites
Lithos, 2000Abstract The composition of pyroxenes from the two occurrences of kamafugites in Brazil — Santo Antonio da Barra and Mata da Corda — was investigated with the aim of comparing the localities and characterizing kamafugitic pyroxenes in general. Kamafugitic pyroxene is always diopside, except for late phases that can be richer in aegirine.
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On hour-glass sector zoning in clinopyroxene
Mineralogical Magazine, 1973SummaryThe observations of hour-glass sector zoning from four selected clinopyroxenes in undersaturated lavas best fit a model in which the sector zoning is formed due to a structural requirement in a growth direction normal to {100} where a high concentration of silicate units, required to build the silicate chains, is unsatisfied. In these sectors Al
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The origin of clinopyroxene in cratonic mantle
2003info:eu-repo/semantics ...
Coussaert, Nicolas +6 more
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