Dr Johannes Obenholzner

Research Associate

Naturhistorisches Museum/Mineralogie
Postfach 417
A-1040 Wien
Austria
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Research Expertise

Characterization of tephra and aerosols with special interest in barite (barium sulphate). Recently, work has focused on characterization of aerosols from Popocatepetl, Solfatra, Etna and Vulcano, using the FESEM/EDS technique. The images and spectra obtained are available for use by other researchers (please contact Johannes directly). Field emission scanning electronmicroscopy analysis is performed at the Zentrum fuer Elektronenmikroskopie, Technical University of Graz, Austria in cooperation with P. Poelt and H. Schroettner. See also: www.felmi-zfe.at.

Relevant Publications

Obenholzner, J.H. and Heiken, G. 1999. Pyroclast relict textures in the Triassic Rio Fontanaz Tuff - similarities of vesiculation and fragmentation with the Quarternary Campanian Ignimbrite. Acta Vulcanol., Vol. 11 (2) 283-292.

Obenholzner. J.H., Schroettner, H. Golob, P., Delgado, H. 2003. Particles From the Plume of Popocatepetl Volcano, Mexico - the FESEM/EDS approach. Submitted to Geological Society (UK) Special Publication, eds. C. Oppenheimer & D. Pyle (Cambridge): VOLCANIC GASES - in press

Obenholzner, J.H., Schroettner, H., Delgado, H. 2003. Barite aerosol particles from volcanic plumes and fumaroles - FESEM/EDS analysis. EGS-AGU-EUG, Nice 2003.