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The breakdown of diopside to (Ca, Mg)SiO3 perovskite–(Mg, Ca, Fe)SiO3 glass–(Mg, Ca)SiO3 glass–(Mg, Ca)SiO3 majorite in a melt vein the Suizhou L6 chondrite

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Abstract

The Suizhou meteorite is a heavily shocked and melted vein-containing L6 chondrite. It contains a minor amount of diopside with a (Ca0.419Mg0.466Fe0.088)SiO3 composition, and a shock-metamorphosed diopside grain associated with ringwoodite and lingunite was found in a melt vein of this meteorite. Our electron microprobe, transmission electron microscopic and Raman spectroscopic analyses revealed four silicate phases with different compositions and structures inside this shock-metamorphosed diopside grain, termed phase A, B, C and D in this paper. Phase A is identified as orthorhombic (Ca0.663Mg0.314)SiO3-perovskite which is closely associated with phase B, the vitrified (Mg0.642Ca0.290Fe0.098)SiO3 perovskite. Phase D is assigned to be (Mg0.578Ca0.414)SiO3 majorite which is associated with phase C, the vetrified Ca-rich Mg-perovskite with a (Mg0.853Ca0.167)SiO3 composition. Based on high-pressure and high-temperature experiments, the diopside grain in the melt vein of the Suizhou meteorite would have experienced a P–T regime of 20–24 GPa and 1800 – > 2000 °C. Such P–T conditions are high enough for the decomposition of the diopside and the formation of four different silicate phases. The orthorhombic (Ca0.663Mg0.314)SiO3 perovskite found in the Suizhou L6 chondrite might be considered as the third lower-mantle silicate mineral after bridgmanite and davemaoite after the detailed analyses of its crystal structure and physical properties being completed.

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Authors and Affiliations

  1. Key Laboratory of Mineralogy and Metallogeny / Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Xiande Xie

  2. School of Geosciences and Info-Physics, Central South University, Changsha, 410083, China

    Xiangping Gu

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  1. Xiande Xie
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Correspondence to Xiande Xie.

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Xie, X., Gu, X. The breakdown of diopside to (Ca, Mg)SiO3 perovskite–(Mg, Ca, Fe)SiO3 glass–(Mg, Ca)SiO3 glass–(Mg, Ca)SiO3 majorite in a melt vein the Suizhou L6 chondrite. Acta Geochim 42, 183–194 (2023). https://doi.org/10.1007/s11631-023-00594-x

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