Experimental calibration of aluminum partitioning between olivine and spinel as a geothermometer

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doi: 10.2138/am.2008.2758
Authors:Wan, Zhihuan; Coogan, Laurence A.; Canil, Dante
Author Affiliations:Primary:
University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada
Volume Title:American Mineralogist
Source:American Mineralogist, 93(7), p.1142-1147. Publisher: Mineralogical Society of America, Washington, DC, United States. ISSN: 0003-004X
Publication Date:2008
Note:In English. 24 refs.; illus., incl. 3 tables
Summary:The temperature dependence of the partitioning of Al2O3 between forsterite-rich olivine and Cr-rich spinels has been experimentally calibrated at 100 kPa between 1250 and 1450°C under reducing conditions. For spinel with values of YCr between 0.07 and 0.69, and containing <0.1 Fe3+ atoms and <0.025 Ti atoms per 4 O atoms the experimental data can be fit to an equation: T(°C) = 10 000/0.512 + 0.873 YCr - 0.91ln(KD) - 273 where YCr = Cr/(Cr + Al) in spinel in atomic proportions and KD = Al2O3ol/Al2O3sp in wt%. This equation reproduces the temperature of the experiment for the calibration data set within ±22°C. Empirical tests suggest that this geothermometer has little pressure dependence within the range of pressures encountered in the crust and upper mantle. [R.A.H.]
Sections:Experimental mineralogy
Mineral Groups:Ortho-and ring silicates
Subjects:Aluminum; Calibration; Equations; Experimental studies; Ferric iron; Geologic thermometry; Iron; Metals; Nesosilicates; Numerical analysis; Olivine; Olivine group; Orthosilicates; Oxides; Partitioning; Silicates; Spinel; Titanium
Abstract Numbers:08M/2958
Record ID:2008104146
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, copyright, Mineralogical Society of America, Reference includes data from GeoScienceWorld, Alexandria, VA, United States
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