NDLI: P-T stability of the lazulite-scorzalite solid-solution series

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P-T stability of the lazulite-scorzalite solid-solution series

Content Provider	Springer Nature Link
Author	Schmid Beurmann, P. Knitter, St. Cemič, L.
Copyright Year	2000
Abstract	The stability of members of the lazulite-scorzalite solid-solution series, (Mg,Fe)Al2 (OH)2(PO4)2, was investigated as a function of T (505 to 675 °C), P (0.1 to 0.3 GPa) and Fe/Mg ratio in hydrothermal synthesis experiments. The oxygen fugacity was controlled by means of the Ni/NiO buffer. It was found that starting from end-member lazulite the stability of the solid-solution members strongly decreases with increasing content of scorzalite component. At 0.2 GPa pure lazulite decomposes at about 660 °C whereas at the same pressure a solid-solution with 80% of lazulite component is only stable up to 590 °C under the oxygen fugacity of the Ni/NiO buffer. The members of the lazulite-scorzalite solid-solution series with limiting composition coexist with an Fe-richer member of the (Mg,Fe)Al(PO4)O series and berlinite. The mixing behaviour of both the lazulite-scorzalite and the (Mg,Fe)Al(PO4)O solid-solution series disregarding small amounts of Fe3+ is interpreted in terms of a model on the basis of a simple mixture for the lazulite-scorzalite system and of an ideal mixture for the (Mg,Fe)Al(PO4)O series. With this model the interaction parameter which expresses the non-ideality of the lazulite-scorzalite solid-solution series amounts to . P-T Stabilität von Lazulith-Scorzalith Mischkristallen Die Stabilität der Glieder der Lazulith-Scorzalith Mischkristallreihe, (Mg, Fe)Al2(OH)2(PO4)2 wurde als Funktion der Temperatur (505 bis 675 °C), des Druckes (0.1 bis 0.3 GPa) und des Fe/Mg-Verhältnisses in hydrothermalen Syntheseversuchen untersucht. Die Sauerstoffugazität wurde mittels eines Ni/NiO-Puffer kontrolliert. Es konnte festgestellt werden, daß ausgehend vom Lazulith-Endglied die Stabilität der Mischkristalle mit zunehmendem Scorzalith-Gehalt stark abnimmt. Reiner Lazulith, MgAl2(OH)2(PO4)2 zerfällt unter 0.2 GPa bei 660 °C, während ein Mischkristall mit 80 mol% Gehalt an Lazulith-Komponente nur bis 590 °C unter der Sauerstoffugazität des Ni/NiO-Puffers stabil ist. Hierbei koexistieren die Lazulith-Scorzalith Mischkristalle mit Grenzzusammensetzung mit eisenreicheren Mischphasen des Systems (Mg,Fe)Al(PO4)2O und Berlinit. Das Mischungsverhalten sowohl der Lazulith-Scorzalith- als auch der (Mg,Fe)Al(PO4)2O-Reihe wurde mit Hilfe eines quantitativen Modelles auf der Basis einer symmetrischen Mischung für Lazulith-Scorzalith und einer idealen Mischung für das System (Mg,Fe)Al(PO4)2O interpretiert. Mit Hilfe dieses Modelles wurde der Wechelwirkungsparameter , der die Nichtidealität der Lazulith-Scorzalith Mischreihe ausdrückt zu bestimmt.
Starting Page	55
Ending Page	71
Page Count	17
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	70
Issue Number	1-2
e-ISSN	14381168
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-08-31
Publisher Place	Wien
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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