Abstract
Pyrophanite in serpentinite at Perkupa (Hungary) is described in detail for the first time as a replacement product of perovskite. It occurs as a 20- to 30-μm-wide rim, mantling a remnant core composed of perovskite or its alteration products. The pyrophanite rim consists of an inner zone, representing a pseudomorph after perovskite, and an outer overgrowth zone. Raman mapping and electron backscatter diffraction data show that the pyrophanite rims typically represent single crystals rather than being composed of multiple domains in different crystallographic orientations. Perovskite occurs exclusively in the core of pyrophanite and was identified as the orthorhombic CaTiO3 phase, based on Raman spectra. Heterogeneous, polyphase mineral cores, consisting of calcite, anatase and/or brookite, kassite, and Mn-bearing kassite, in some cases in association with relict perovskite, are typical in the larger pyrophanite-rimmed grains. The crystallographically coherent pyrophanite rims could have formed through a process where the precursor perovskite crystal acted as a structural template for the newly forming phase, that is, by interface-coupled dissolution reprecipitation during serpentinization of the precursor rock. This alteration of perovskite to pyrophanite was not complete, resulting in the presence of perovskite fragments enclosed in pyrophanite. During the metamorphic evolution of the rock, some of the remnant perovskite cores further altered to TiO2 polymorphs (anatase and brookite) and calcite, via transitional alteration products.
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Acknowledgments
The European Union and the European Social Fund provided financial support for the project through grant agreements no. TÁMOP 4.2.1./B-09/KMR-2010-0003 (EBSD) and TÁMOP-4.2.1.B-10/2/KONV-2010-0001 within the framework of the New Hungary Development Plan. The Raman microscope at the Eötvös University was purchased through funding by the Baross Gábor Programme (REG-KM-09-1-2009-0044). We also acknowledge the help of the Department of Mineral Sciences, Smithsonian National Museum of Natural History, Washington, USA, for providing standards used in the WDX measurements. We would like to thank Guest Editor Anton R. Chakhmouradian, who encouraged us during this work and also gave useful ideas for the preparation of the manuscript. We are also thankful to Evgeny A. Galuskin and Victor V. Sharygin, whose detailed comments and corrections helped improve this paper.
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Zajzon, N., Váczi, T., Fehér, B. et al. Pyrophanite pseudomorphs after perovskite in Perkupa serpentinites (Hungary): a microtextural study and geological implications. Phys Chem Minerals 40, 611–623 (2013). https://doi.org/10.1007/s00269-013-0596-2
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DOI: https://doi.org/10.1007/s00269-013-0596-2