Micro-Raman spectroscopic study of El Gasco pumice, western Spain

Authors

  • F. Rull,

    Corresponding author
    1. Unidad Asociada CSIC-Universidad de Valladolid, Cristalografía y Mineralogia, Valladolid, 47006, Spain
    2. Centro de Astrobiología (CSIC/INTA), associated to the NASA Astrobiology Institute, Ctra. De Ajalvir km.4 28850 Torrejón de Ardoz, Madrid, Spain
    • Centro de Astrobiología (CSIC/INTA), associated to the NASA Astrobiology Institute, Ctra. De Ajalvir km.4 28850 Torrejón de Ardoz, Madrid, Spain.
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  • J. Martinez-Frias,

    1. Unidad Asociada CSIC-Universidad de Valladolid, Cristalografía y Mineralogia, Valladolid, 47006, Spain
    2. Centro de Astrobiología (CSIC/INTA), associated to the NASA Astrobiology Institute, Ctra. De Ajalvir km.4 28850 Torrejón de Ardoz, Madrid, Spain
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  • J. A. Rodríguez-Losada

    1. Departamento de Edafología y Geología, Facultad de Biología, Univ. La Laguna, La laguna, Tenerife Islas Canarias, Spain
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Abstract

A micro-Raman spectroscopic study of pumice materials from El Gasco (Sierra de Gata, Spain) has been performed for the first time. The obtained spectra allow the precise identification of the minerals, quartz, haematite, magnetite, ilmenite, rutile and anatase, in general agreement with results obtained by complementary techniques of X-Ray Diffraction (XRD) and Electron Microprobe. Also, fayalite and ferroan ringwoodite have been identified. The presence of high-pressure polymorphs indicates that the pumice rocks were subjected to high-pressure conditions quite similar to those observed in shock-induced molten and recrystallised materials, such as some meteorites and impact-related rocks. Copyright © 2006 John Wiley & Sons, Ltd.

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