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- W2327666931 abstract "The composition of synthetic amphiboles was investigated experimentally along the tremolitetschermakite join in the system CaO-MgO-Al 2 O 3 -SiO 2 -H 2 O-Br 2 . Compositions of these amphiboles were studied within the phase assemblages: amphibole-anorthite-quartz-diopside (I), amphiboleanorthite- quartz-talc (II), amphibole-anorthite-quartz-enstatite (III), amphibole-anorthite-talcclinochlore (IV), amphibole-zoisite-talc-quartz (V), and amphibole-zoisite-talc-clinochlore (VI). Assemblages were synthesized from oxide-hydroxide mixtures in the presence of a CaBr 2 -bearing solution between 600-800 °C and 200-2000 MPa. Solid phases were investigated using SEM, HRTEM, EMP, and XRD techniques. EMP data show that the amphiboles produced are solid solutions of the ternary system tremolite-tschermakite-cummingtonite. Enstatite, diopside, talc, and clinochlore showed small deviations from their respective end-member compositions due to incorporation of some Al. The thermodynamic properties of the tschermakite end-member and the mixing properties along the tremolite-tschermakite join were extracted from corresponding exchange reactions of the unreversed synthesized phase assemblages I-VI. Various ideal mixing models were tested for Al-Mg and Al-Si substitution at octahedral M2 and M3 sites and at tetrahedral T1-sites. Best fits were obtained for a two-site coupled model, resulting in Δ f H 0 ts = -12528.3 ± 11.7 kJ/mol and S 0 ts = 556.5 ± 12.0 J/(mol·K) for the tschermakite end-member. Similar calculations were carried out for magnesiohornblende, and values of Δ f H 0 Mghb = -12418.7 ± 5.9 kJ/mol and S 0 Mghb = 562.8 ± 6.1 J/(mol·K) were extracted. Calculated phase relations and amphibole compositions agree well with experimental data if the derived thermodynamic data of tschermakite and a two-site mixing model for Al incorporation in amphibole solid solutions are applied." @default.
- W2327666931 created "2016-06-24" @default.
- W2327666931 creator A5003954112 @default.
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- W2327666931 date "2002-04-01" @default.
- W2327666931 modified "2023-10-16" @default.
- W2327666931 title "Composition of synthetic tremolite-tschermakite solid solutions in amphibole + anorthite-and amphibole + zoisite-bearing assemblages" @default.
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- W2327666931 doi "https://doi.org/10.2138/am-2002-0410" @default.
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