Home Physical Sciences Melting curve minimum of barium carbonate BaCO3 near 5 GPa
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Melting curve minimum of barium carbonate BaCO3 near 5 GPa

  • Junjie Dong EMAIL logo , Jie Li , Feng Zhu , Zeyu Li and Rami Farawi
Published/Copyright: April 26, 2019
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Abstract

The melting point of barium carbonate (BaCO3) was determined at pressures up to 11 GPa using the ionic conductivity and platinum (Pt) sphere methods in a multi-anvil press. The melting point decreases with pressure from 2149 ± 50 K at 3 GPa to a fitted local minimum of 1849 K at 5.5 GPa, and then it rises with pressure to 2453 ± 50 K at 11 GPa. The fitted melting curve of BaCO3 based on the ionic conductivity measurements is consistent with the Pt sphere measurements that were carried out independently at selected pressures. The negative slope of the BaCO3 melting curve between 3 and 5.5 GPa indicates that the liquid is denser than the solid within this pressure range. Synchrotron X‑ray diffraction (XRD) measurements in a laser-heated diamond-anvil cell (LH-DAC) showed that BaCO3 transformed from the aragonite structure (Pmcn) to the post-aragonite structure (Pmmn) at 6.3 GPa and 1026 K as well as 8 GPa and 1100 K and the post-aragonite structure remained metastable upon quenching and only reverted back to the witherite structure upon pressure release. The local minimum near 5 GPa is attributed to the triple point where the melting curve of BaCO3 meets a phase transition to the denser post-aragonite structure (Pmmn). Local minima in the melting curves of alkaline earth carbonates would lead to incipient melting of carbonated rocks in Earth’s mantle.


Present address: Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, U.S.A.

Orcid 0000-0003-1114-9348.

† Orcid 0000-0003-4761-722X.

‡ Present address: Hawaii Institute of Geophysics and Planetology, University of Hawai‘i at Mānoa, Honolulu, Hawaii, U.S.A. Orcid 0000-0003-2409-151X.

§ Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html


Funding and Acknowledgments

This work was supported by Alfred P. Sloan Foundation grant G-2016-7157 and grant G-2017-9954, and by National Science Foundation grant EAR 1763189, and grant AST 1344133. In addition, we thank Cassandra Seltzer for her assistance with the platinum sphere experiments; David Walker and Matthew Brennan for discussions and comments on the manuscript.

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Received: 2018-11-12
Accepted: 2019-02-11
Published Online: 2019-04-26
Published in Print: 2019-05-27

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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