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The discovery of TiO2-II, the α-PbO2-structured high-pressure polymorph of rutile, in the Suizhou L6 chondrite

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Abstract

We report the discovery of TiO2-II in the unmelted rock of the shocked Suizhou L6 chondrite. Natural TiO2-II was previously found in ultrahigh-pressure metamorphic and mantle-derived rocks, terrestrial impact structures, and tektite. Our microscopic, Raman spectroscopic, electron microprobe and transmission electron microscopic investigations have revealed: (1) All observed TiO2-II grains are related with ilmenite and pyrophanite; (2) TiO2-II occurs as needle- and leaf-shaped inclusions in ilmenite and patch-, tape-shaped body in pyrophanite; (3) The composition of TiO2-II is identical with that of its precursor rutile; (4) The Raman spectrum of TiO2-II is in good agreement with that of natural and synthesized α-PbO2-type TiO2; (5) TiO2-II occurs mainly in the form of well-ordered nano-domains and small mis-orientation among the domains can be observed. (6) All electron diffraction reflections from TiO2-II can be indexed to α-PbO2 structure in space group Pbcn with lattice parameters of a = 4.481 Å, b = 5.578 Å and c = 4.921 Å; (7) The exsolution inclusions of rutile from host ilmenite are mostly connected with an alternation process along the lamellar twinning plane of ilmenite induced by shock-induced high pressure and high temperature; (8) The P–T regime of 20–25 GPa and 1000 °C estimated for the Suizhou unmelted rock is suitable for phase transition of rutile into TiO2-II phase.

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Acknowledgements

The authors are grateful to Professor Huifang Xu of the Department of Geoscience, University of Wisconsin-Madison, U.S.A, for his help in dealing with the TEM images of TiO2-II phase.

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Authors and Affiliations

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

    Xiande Xie & Ming Chen

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

    Xiangping Gu

  3. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Ming Chen

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  1. Xiande Xie
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Correspondence to Xiande Xie.

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Xie, X., Gu, X. & Chen, M. The discovery of TiO2-II, the α-PbO2-structured high-pressure polymorph of rutile, in the Suizhou L6 chondrite. Acta Geochim 42, 1–8 (2023). https://doi.org/10.1007/s11631-022-00585-4

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  • DOI: https://doi.org/10.1007/s11631-022-00585-4

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