Experimental observations of CaSiO3-CaTiO3 perovskites: implications for Ca-rich inclusions observed in sub-lithospheric diamonds

IF 1.2 4区地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Physics and Chemistry of Minerals Pub Date : 2025-05-04 DOI:10.1007/s00269-025-01321-z

A. R. Thomson, W. A. Crichton, N. C. Siersch, I. S. Ezad, D. P. Dobson, J. P. Brodholt

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Abstract

Calcium perovskite is a major component of deep mantle phase assemblages and has been frequently identified, in retrograde form, as polyphase mineral inclusions within sub-lithospheric diamonds. Here experimental observations of synthetic samples demonstrate various properties of calcium perovskite minerals which have relevance for the interpretation of diamond-hosted inclusions. Ambient pressure diffraction and spectroscopy confirm the linear dependence of crystallographic unit cell volume and Raman peak shifts across the entire CaSiO₃-CaTiO₃ binary join. These systematics will allow verification of perovskite structure and constraint of inclusion composition, without destructive analyses, in future studies. Additionally, high pressure observations confirm that calcium perovskite minerals ≳ 80 mol.% CaSiO₃ undergo spontaneous amorphization during decompression at room temperature, meaning they are unrecoverable. Finally, the presence of water appears to expand the calcium perovskite stability field to lower pressure conditions, implying at least some appreciable water-solubility in these minerals.

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CaSiO3-CaTiO3钙钛矿的实验观测：岩石圈下钻石中富钙包裹体的意义

钙钛矿是深部地幔相组合的主要组成部分，经常以逆行形式被鉴定为岩石圈下钻石中的多相矿物包裹体。在这里，合成样品的实验观察证明了钙钛矿矿物的各种性质，这些性质与金刚石包裹体的解释有关。环境压力衍射和光谱学证实了整个CaSiO3-CaTiO3二元连接中晶体学单位胞体积和拉曼峰移的线性依赖关系。这些系统分析将允许在未来的研究中验证钙钛矿的结构和包裹体组成的约束，而不需要破坏性的分析。此外，高压观测证实，钙钛矿矿物≥80 mol.% CaSiO3在室温减压过程中自发非晶化，这意味着它们是不可恢复的。最后，水的存在似乎扩大了钙钛矿在较低压力条件下的稳定性场，这意味着在这些矿物质中至少有一些明显的水溶性。

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

Physics and Chemistry of Minerals 地学-材料科学：综合

CiteScore

2.90

自引率

14.30%

发文量

审稿时长

3 months

期刊介绍： Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)