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Oxygen isotope fractionation between rutile and water and geothermometry of metamorphic eclogites

Published online by Cambridge University Press:  05 July 2018

Alan Matthews ,
Robert D. Beckinsale  and
John J. Durham
Alan Matthews
Affiliation:
Department of Geology, Hebrew University of Jerusalem, JerusalemIsrael
Robert D. Beckinsale
Affiliation:
Geochemical Division, Institute of Geological Sciences, Gray's Inn Road, London WCIX 8NG
John J. Durham
Affiliation:
Geochemical Division, Institute of Geological Sciences, Gray's Inn Road, London WCIX 8NG
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Summary

Oxygen isotope fractionation between rutile and water has been studied from 300 °C to 700 °C, PH2O = 1 kb, using aqueous oxidation of titanium metal as the equilibration reaction. The mechanism of rutile formation (which is critical to the assessment of isotopic equilibrium) is an ‘armouring’ reaction in which rutile grows around grains of titanium metal by solution-precipitation processes. Mean fractionation factors expressed as 103 In αTiO2-H2O obtained in the present study are:

−6.20±0.23‰ at 304±5 °C

−6.64±0.27‰ at 405±6 °C

−6.11±0.16%. at 508±6 °C

−4.45±0.28%. at 608±6 °C

−3.38±0.15%. at 698±6 °C.

These data agree with those obtained at temperatures above 500 °C by Addy and Garlick (1974) but do not accord with theoretical predictions by Bottinga and Javoy (1973). A minimum in the calibration curve 103 ln α versus 106T−2 occurs between 300 °C and 500 °C but from 500 °C to 700 °C 18O fractionation between rutile and water may be expressed by the equation:

103 ln α = −(4.72±0.40)106T−2+(1.62±0.53).

Oxygen isotope analyses of rutile and quartz from metamorphic eclogites and schists from the Tauern Window, Austria, yield isotopic temperatures at about 550 °C in agreement with results obtained on similar rocks from the Sesia Zone (Western Alps, Italy) and elsewhere by other workers. Petrologic studies indicate that the latest metamorphism of the Tauern eclogites reached about 450 °C Thus the measured partitions of 18O between rutile and quartz indicating temperatures around 550 °C have been inherited from an earlier metamorphic event.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 327 , September 1979 , pp. 405 - 413
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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Footnotes

1

Present address: Department of Geophysical Sciences, University of Chicago.

References

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