Determination of calcium carbonate and sodium carbonate melting curves up to Earth's transition zone pressures with implications for the deep carbon cycle
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- 作者：Zeyu Lia ; Jie Lia ; jackieli@umich.edu" class="auth_mail" title="E-mail the corresponding author ; Rebecca Langea ; Jiachao Liua ; Burkhard Militzerb ; c
- 关键词：calcite V ; aragonite ; Clapeyron slope ; density crossover ; carbonatite ; subduction
- 刊名：Earth and Planetary Science Letters
- 出版年：2017
- 出版时间：1 January 2017
- 年：2017
- 卷：457
- 期：Complete
- 页码：395-402
- 全文大小：1630 K
文摘
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Experiments show that between 6 and 21 GPa CaCO3 melts within 50 K of 2000 K.
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Experiments place the calcite V-aragonite-liquid invariant point at 13 GPa and 1970 K.
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Experiments show that Na2CO3 melting point rises with pressure to 1950 K at 17 GPa.
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Experiments and simulations suggest a density crossover between calcite V and liquid.
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Simulations confirm that aragonite is denser than liquid at pressures up to 30 GPa.