High-pressure and high-temperature structure and equation of state of Na₃Ca₂La(CO₃)₅ burbankite

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2022-06-13 DOI:10.5194/ejm-34-351-2022

S. Milani, Deborah Spartà, P. Fumagalli, Boby Joseph, R. Borghes, V. Chenda, J. Maurice, G. Bais, M. Merlini

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Abstract

Abstract. In this study we report the synthesis of single crystals of burbankite, Na3Ca2La(CO3)5, at 5 GPa and 1073 K. The structural evolution, bulk modulus and thermal expansion of burbankite were studied and determined by two separate high-pressure (0–7.07(5) GPa) and high-temperature (298–746 K) in situ single-crystal X-ray diffraction experiments. The refined parameters of a second-order Birch–Murnaghan equation of state (EoS) are V0= 593.22(3) Å3 and KT0= 69.8(4) GPa. The thermal expansion coefficients of a Berman-type EoS are α0= 6.0(2) ×10-5 K−1, α1= 5.7(7) ×10-8 K−2 and V0= 591.95(8) Å3. The thermoelastic parameters determined in this study allow us to estimate the larger density of burbankite in the pressure-temperature range of 5.5–6 GPa and 1173–1273 K, with respect to the density of carbonatitic magmas at the same conditions. For this reason, we suggest that burbankite might fractionate from the magma and play a key role as an upper-mantle reservoir of light trivalent rare earth elements (REE3+).

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Na3Ca2La（CO3）5硼镁石的高压高温结构及状态方程

摘要在这项研究中，我们报道了在5 GPa和1073 K.通过两种不同的高压（0–7.07（5） GPa）和高温（298–746 K）原位单晶X射线衍射实验。二阶Birch–Murnaghane状态方程（EoS）的精细参数为V0= 593.22（3） Å3和KT0= 69.8（4） GPa。Berman型EoS的热膨胀系数为α0= 6.0（2） ×10-5 K−1，α1= 5.7（7） ×10-8 K−2和V0= 591.95（8） Å3.本研究中确定的热弹性参数使我们能够在5.5–6的压力-温度范围内估计出更大的burbankite密度 GPa 1173-1273 K、关于相同条件下碳酸盐岩岩浆的密度。因此，我们认为burbankite可能从岩浆中分馏出来，并作为轻三价稀土元素（REE3+）的上地幔储层发挥关键作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.