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American Mineralogist
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American Mineralogist; August 2005; v. 90; no. 8-9; p. 1458-1461; DOI: 10.2138/am.2005.1901
© 2005 Mineralogical Society of America
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Letter

{alpha}-PbO2-type nanophase of TiO2 from coesite-bearing eclogite in the Dabie Mountains, China

Xiuling Wu1,2, Dawei Meng1,2,* and Yujing Han1

1 Testing Centre and Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2 Laboratory of Atomic Imaging of Solids, Institute of Metal Research, Academia Sinica, Shenyang 110015, China

Correspondence: * E-mail: dwmeng{at}cug.edu.cn

A natural high-pressure phase of titanium oxide with {alpha}-PbO2-structure has been found in omphacite from coesite-bearing eclogite at Shima in the Dabie Mountains, China. High-resolution transmission electron microscope observations have revealed an orthorhombic lattice, corresponding to {alpha}-PbO2-type TiO2 with cell parameters a = 0.461 nm, b = 0.540 nm, c = 0.497 nm and space group Pbcn. It occurs as nanometer-thick (<2 nm) lamellae between multiple twinned rutile crystals, providing additional evidence of very high-pressure, metamorphism at 7 GPa, 900 °C. This implies subduction of continental material to a depth of more than 200 kilometers. {alpha}-PbO2-type TiO2 could be an extremely useful index mineral for ultrahigh-pressure.




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