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Variations in the OH concentration of rutiles from different geological environments

Die Variation in der OH Konzentration von Rutilen unterschiedlicher geologischer Vorkommen

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Summary

A suite of 19 rutiles form a wide range of geological environments shows a distinct variability in the OH concentrations. The analytical H2O+ content determined by IR spectroscopy varies from 0.04 to 0.21 wt.% with the greatest amounts occurring in amphibolite facies rutiles. The main feature of the IR spectra in the region of the OH stretching fundamental is a single narrow band centered at 3280 cm−1; some of the spectra show an additional band, centered either at 3360 or at 3320 cm−1. Varying OH concentrations in rutiles are probably a function of the activity of hydrous components during crystallization and are weakly correlated to a minor content of tri- and pentavalent elements.

Zusammenfassung

Eine Serie von 19 Rutilen aus unterschiedlichen geologischen Vorkommen zeigt eine deutliche Variabilität in den OH Konzentrationen. Der IR spektroskopisch bestimmte analytische H2O+-Gehalt variiert von 0.04 bis 0.21 Gew.%, wobei die höchsten Gehalte in Rutilen der Amphibolitfacies auftreten. Das wesentliche Merkmal der IR Spektren im Bereich der OH Streckschwingung ist eine einzelne schmale Bande bei 3280 cm−1; einige der Spektren zeigen entweder bei 3360 oder bei 3320 cm−1 eine zusätzliche Bande. Wahrscheinlich stellen die variierenden OH Konzentrationen, die mit einem geringen Gehalt an drei- und fünfwertigen Elementen schwach korreliert sind, eine Funktion der “Wasser”-Aktivitäten bei der Kristallisation dar.

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Vera Hammer, M.F., Beran, A. Variations in the OH concentration of rutiles from different geological environments. Mineralogy and Petrology 45, 1–9 (1991). https://doi.org/10.1007/BF01164498

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