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Cooperation needed in ICP-MS and FEGSEM/EDS of exposed glass fibers
From: "Johannes Obenholzner" <obenholzner@xxxxxx>
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Dear colleagues,
please read the attached abstract. I need analytical cooperation in ICP-MS and FEDSEM/EDS. If you are interested in coauthorship please send an email to Obenholzner@xxxxxx.
Thank you and best wishes
Dr. J.H. Obenholzner
IONS, VAPORS AND/OR NANOPARTICLES PENETRATING VOLCANIC EDIFICES?
J.H. OBENHOLZNER (1), J. L. Parks (2), M. Edwards(2), P. Fulignati(3)
(1) NHM/Volcanology, Postfach 417, A-1014 Vienna, Austria/Europe; obenholzner@xxxxxx; (2) VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY, 418 DURHAM HALL, BLACKSBURG, VA 24061-0246, USA; jparks@xxxxxx; edwardsm@xxxxxx; (3)Dipt. di Science della Terra, University of Pisa, Via S. Maria, 53, 56126 Pisa, Italy; fulignati@xxxxxxxxxxxx.
A top-sealed plastic tube with a diameter of ca. 15 cm had been buried ca. 70 cm deep vertically at the base of La Fossa volcano, Vulcano island, Italy, next to the front of the obsidian flow. The tube had been filled with layered rock and quartz wool to condense vapors emanating from the soil. At ca. 75 cm below the surface the sample had been exposed to vapors from Sept. 2005 to April 2006. The leached sample had not been in touch with the ground. 2 other glass wool cushions (ca. 10 cm thick, uncompacted) had been underneath to minimize capillary effects. A rock wool layer not touching ground revealed nucleated sylvite (KCl ~10 µm in size) and barite (BaSO4 ~5-10 µm in size) crystals by SEM/EDS in its basal portion. Other very small (< 2 µm) particles were observed on the rock wool fibers but we could not identify them because they were suddenly volatilized by the electron beam. The bright appearance in backscattered images suggests that these particles may be metal compounds. The nucleation of sylvite and barite documents the presence of ions. Leaching of the quartz wool at room temperature with deionized H2O and ICP-MS analysis documented 4 groups of elements: 1. positive signal: Mg, K, Ca, Cr, Mn, Ni, (Ba); low to moderate volatility at magmatic conditions. 2. unclear signal: Al, Si, P, Fe; low volatility at magmatic conditions. 3. no signal: V, As, Se, Mo, Co. As, Se, Mo, V are considered to be highly volatile, Co got a low volatiliy. 4. positive signal: Cu, Zn, Cd, Sn, Pb, W; high volatility at magmatic conditions. Leaching with nitric acid documented also V and Fe, and produced higher values for all elements, except K and Sn. This experiment documents for the first time an unknown element transport by vapors/gases through a volcanic edifice interacting with hydrothermal and magmatic gases. More information can be found at http://www.iugg2007perugia.it/webbook/
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