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Fe2+ substitution in coexisting wadsleyite and clinopyroxene under hydrous conditions: implications for the 520-km discontinuity

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Abstract

Chemical compositions and crystal structures of coexisting wadsleyite, clinopyroxene, and phase E (synthesized at 1400 °C and 18 GPa under hydrous conditions) have been analyzed by electron microprobe, single-crystal X-ray diffraction, and Raman spectroscopy. Single-crystal X-ray diffraction analyses indicate that Fe2+ substitution in the crystal structure significantly decreases the configurational entropies of wadsleyite and clinopyroxene in the middle transition zone under water-saturated conditions, providing a new thermodynamic constraint on the stability of ferromagnesian silicates near the wadsleyite–ringwoodite phase boundary (about 520 km). The variation in the depth of the 520-km discontinuity under hydrous conditions can be partly due to Fe2+ incorporation into wadsleyite.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (No. 41802035) and U.S. National Science Foundation (EAR 14-16979 to J.R.S.) and China Postdoctoral Science Foundation (No. 2017M620508). Multi-anvil experiments were supported by Bayerisches Geoinstitut Visitors Program.

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  1. School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China

    Li Zhang

  2. Department of Geological Sciences, University of Colorado, Boulder, CO, 80309, USA

    Li Zhang & Joseph R. Smyth

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  1. Li Zhang
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  2. Joseph R. Smyth
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Correspondence to Li Zhang.

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Zhang, L., Smyth, J.R. Fe2+ substitution in coexisting wadsleyite and clinopyroxene under hydrous conditions: implications for the 520-km discontinuity. Phys Chem Minerals 47, 2 (2020). https://doi.org/10.1007/s00269-019-01072-8

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