| Title | The aluminum-in-olivine thermometer for mantle peridotites Ñ Experimental versus empirical calibration and potential applications |
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| Author | Bussweiler, Y; Brey, G P; Pearson, D G; Stachel, T; Stern, R A; Hardman, M F; Kjarsgaard, B A ; Jackson, S E |
| Source | Lithos vol. 272-273, 2017 p. 301-314, https://doi.org/10.1016/j.lithos.2016.12.015 |
| Year | 2017 |
| Alt Series | Natural Resources Canada, Contribution Series 20182167 |
| Publisher | Elsevier BV |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Program | GSC Central Canada Division |
| Released | 2016 12 24 |
| Abstract | This study provides an experimental calibration of the empirical Al-in-olivine thermometer for mantle peridotites proposed by De Hoog et al. (2010). We report Al concentrations measured by secondary ion
mass spectrometry (SIMS) in olivines produced in the original high-pressure, high-temperature, four-phase lherzolite experiments by Brey et al. (1990). These reversed experiments were used for the calibration of the two-pyroxene thermometer and
Al-in-orthopyroxene barometer by Brey and Khler (1990). The experimental conditions of the runs investigated here range from 28 to 60 kbar and 1000 to 1300 ¡C. Olivine compositions from this range of experiments have Al concentrations that are
consistent, within analytical uncertainties, with those predicted by the empirical calibration of the Al-in-olivine thermometer for mantle peridotites. Fitting the experimental data to a thermometer equation, using the least squares method, results
in the expression: T¡C=11245+46.0?Pkbar/(13.68ÐlnAlppmÐ273. This version of the Al-in-olivine thermometer appears to be applicable to garnet peridotites (lherzolites and harzburgites) well outside the range of experimental conditions investigated
here. However, the thermometer is not applicable to spinel-bearing peridotites. We provide new trace element criteria to distinguish between olivine from garnet-, garnet-spinel-, and spinel-facies peridotites. The estimated accuracy of the
thermometer is ± 20 ¡C. Thus, the thermometer could serve as a useful tool in settings where two-pyroxene thermometry cannot be applied, such as garnet harzburgites and single inclusions in diamond. |
| GEOSCAN ID | 310729 |
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