Abstract
Experiments were performed from 950 to 1250 °C and 1.5–2.4 GPa to determine the effect of pressure (P) on the temperature (T)-dependent partitioning of Al between olivine and spinel, using mixtures of natural spinel, olivine, clino- and ortho-pyroxene. When compared to 100 kPa experiments, the results show that there is no discernible effect of pressure on the Al-in-olivine thermometer at PT conditions relevant to the spinel peridotite facies. In our experiments with high-Cr spinel, we see no change in Al in olivine from starting values, likely due to the refractory nature of high-Cr spinel. Phase boundary flourescence prevented accurate quantification of Ca in olivine in the run products by electron microprobe analysis but measurements by laser ablation are consistent with the Köhler and Brey (Geochim Cosmochim Acta 54:2375–2388, 1990) Ca-in-olivine thermobarometer. The combination of Al (for T) and Ca (for P) in olivine thus has great potential for thermobarometry in spinel facies peridotites. As a test we apply this approach to published high precision Ca and Al data for olivine from the Ray Pic spinel peridotite xenoliths from the Massif Central (De Hoog et al. Chem Geol 270:196–215, 2010). Reassuringly, the calculated PT conditions (1.0–1.8 GPa; 900–1080 °C) for all samples lie beneath the Moho, within the spinel peridotite facies and fall along a geophysically constrained geotherm.
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Acknowledgements
We are grateful to J. Spence (UVic), A. Locock (UA), and M. Raudsepp (UBC) and for analytical assistance, and to P. Nimis and G. Yaxley for their reviews of our paper. This research was supported by NSERC of Canada Discovery grants to DC and LC.
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D’Souza, R.J., Canil, D. & Coogan, L.A. Geobarometry for spinel peridotites using Ca and Al in olivine. Contrib Mineral Petrol 175, 5 (2020). https://doi.org/10.1007/s00410-019-1647-6
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DOI: https://doi.org/10.1007/s00410-019-1647-6