NDLI: Experimental investigation of zoisite–clinozoisite phase equilibria in the system CaO–Fe2O3–Al2O3–SiO2

Content Provider	Springer Nature Link
Author	Brunsmann, A. Franz, G. Heinrich, W.
Copyright Year	2002
Abstract	The system Ca2Al3Si3O11(O/OH)–Ca2Al2FeSi3O11(O/OH), with emphasis on the Al-rich portion, was investigated by synthesis experiments at 0.5 and 2.0 GPa, 500–800 °C, using the technique of producing overgrowths on natural seed crystals. Electron microprobe analyses of overgrowths up to >100 µm wide have located the phase transition from clinozoisite to zoisite as a function of P–T–Xps and a miscibility gap in the clinozoisite solid solution. The experiments confirm a narrow, steep zoisite–clinozoisite two-phase loop in T–Xps section. Maximum and minimum iron contents in coexisting zoisite and clinozoisite are given by $${\rm X}_{{\rm ps}}^{{\rm zo}} {\rm (max) = 1}{\rm .910}^{ - 4} T{\rm + 3}{\rm .110}^{ - 2} P - {\rm 5}{\rm .3610}^{ - 2} $$ and $${\rm X}_{{\rm ps}}^{{\rm czo}} {\rm (min)} = {\rm (4}{\rm .6} {\rm 10}^{ - {\rm 4}} - 4 * {\rm 10}^{ - {\rm 5}} P{\rm )}T + {\rm 3}{\rm .82} * {\rm 10}^{ - {\rm 2}} P - {\rm 8}{\rm .76} * {\rm 10}^{ - {\rm 2}} $$ (P in GPa, T in °C). The iron-free end member reaction clinozoisite = zoisite has equilibrium temperatures of 185±50 °C at 0.5 GPa and 0±50 °C at 2.0 GPa, with ΔH r 0=2.8±1.3 kJ/mol and ΔS r 0=4.5±1.4 J/mol×K. At 0.5 GPa, two clinozoisite modifications exist, which have compositions of clinozoisite I ~0.15 to 0.25 Xps and clinozoisite II >0.55 Xps. The upper thermal stability of clinozoisite I at 0.5 GPa lies slightly above 600 °C, whereas Fe-rich clinozoisite II is stable at 650 °C. The schematic phase relations between epidote minerals, grossular-andradite solid solutions and other phases in the system CaO–Al2O3–Fe2O3–SiO2–H2O are shown.
Starting Page	115
Ending Page	130
Page Count	16
File Format	PDF
ISSN	00107999
Journal	Contributions to Mineralogy and Petrology
Volume Number	143
Issue Number	1
e-ISSN	14320967
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-01-12
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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