Measurement of H2O Molecule and Hydroxyl Concentrations in Hydrous Rhyolitic Glass by UV–Vis–NIR Dispersive Microspectroscopy
National Research Institute for Earth Science and Disaster Resilience (NIED)
3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan
The speciation of water in volcanic glass, as indicated by the relative proportions of H2O and OH–, provides information on the processes of volcanic eruptions. Earlier studies of water species used ultraviolet–visible–near-infrared (UV–Vis–NIR) dispersive spectroscopy to examine the NIR spectra of volcanic glass but were unable to confirm whether areas as small as 100 μm across could be studied. Here, UV–Vis–NIR dispersive microspectroscopy was applied in a study of hydrous rhyolitic glass synthesized by decompression in a cold-seal pressure vessel at 880°C. The concentrations of water species were determined by transmittance spectroscopy, with results consistent with those of Fourier-transform infrared microspectroscopy. The measured total water contents were consistent with the known solubility of water in rhyolitic magma, and, therefore, it is concluded that UV–Vis–NIR microspectroscopy can be applied in determining the concentrations of H2O and OH– in hydrous rhyolitic glass.
-  E. Stolper, “Water in silicate glasses: An infrared spectroscopic study,” Contributions to Mineralogy and Petrology, Vol.81, Issue 1, pp. 1-17, doi: 10.1007/BF00371154, 1982.
-  P. D. Ihinger, Y. Zhang, and E. M. Stolper, “The speciation of dissolved water in rhyolitic melt,” Geochimica Cosmochimica Acta, Vol.63, Issue 21, pp. 3567-3578, doi: 10.1016/S0016-7037(99)00277-X, 1999.
-  S. J. Mitchell, I. M. McIntosh, B. F. Houghton, R. J. Carey, and T. Shea, “Dynamics of a powerful deep submarine eruption recorded in H2O contents and speciation in rhyolitic glass: The 2012 Havre eruption,” Earth Planetary Science Letters, Vol.494, pp. 135-147, doi: 10.1016/j.epsl.2018.04.053, 2018.
-  S. Okumura and N. Hirano, “Carbon dioxide emission to Earth’s surface by deep-sea volcanism,” Geology, Vol.41, No.11, pp. 1167-1170, doi: 10.1130/G34620.1, 2013.
-  T. Yokoyama, S. Okumura, and S. Nakashima, “Hydration of rhyolitic glass during weathering as characterized by IR microspectroscopy,” Geochimica et Cosmochimica Acta, Vol.72, Issue 1, pp. 117-125, doi: 10.1016/j.gca.2007.10.018, 2008.
-  I. McIntosh, E. W. Llewellin, M. C. S. Humphreys, A. R. L. Nichols, A. Burgisser, C. I. Schipper, and J. F. Larsen, “Distribution of dissolved water in magmatic glass records growth and resorption of bubbles,” Earth Planetary Science Letters, Vol.401, pp. 1-11, doi: 10.1016/j.epsl.2014.05.037, 2014.
-  P. J. Wallace, J. Dufek, A. T. Anderson, and Y. Zhang, “Cooling rates of Plinian-fall and pyroclastic-flow deposits in the Bishop Tuff: inferences from water speciation in quartz-hosted glass inclusions,” Bulletin of Volcanology, Vol.65, Issues 2-3, pp. 105-123, doi: 10.1007/s00445-002-0247-9, 2003.
-  S. Newman, E. M. Stolper, and S. Epstein, “Measurement of water in rhyolitic glasses; calibration of an infrared spectroscopic technique,” American Mineralogist, Vol.71, Nos.11-12, pp. 1527-1541, 1986.
-  H. Masago, “UV/Vis spectroscopy,” J. of the Japan Society of Colour Material, Vol.78, No.11, pp. 531-538, 2005 (in Japanese).
-  N. Imai, S. Terashima, S. Itoh, and A. Ando, “1994 compilation values for GSJ reference samples, “Igneous rock series”,” Geochemical J., Vol.29, Issue 1, pp. 91-95, doi: 10.2343/geochemj.29.91, 1995.
-  J. E. Gardner, M. Hilton, and M. R. Carroll, “Experimental constraints on degassing of magma: isothermal bubble growth during continuous decompression from high pressure,” Earth and Planetary Science Letters, Vol.168, Issues 1-2, pp. 201-218, doi: 10.1016/S0012-821X(99)00051-5, 1999.
-  I. Miyagi, “A grooved glass surface-plate for making a flat polished surface,” Earth, Planets and Space, Vol.69, Issue 1, Article No.1, doi: 10.1186/s40623-016-0587-x, 2017.
-  T. Miwa and A. Toramaru, “Conduit process in vulcanian eruptions at Sakurajima volcano, Japan: Inference from comparison of volcanic ash with pressure wave and seismic data,” Bulletin of Volcanology, Vol.75, Issue 1, Article No.685, doi: 10.1007/s00445-012-0685-y, 2013.
-  G. H. Siegel, Jr., “Ultraviolet spectra of silicate glasses: A review of some experimental evidence,” J. of Non-Crystalline Solids, Vol.13, Issue 3, pp. 372-398, doi: 10.1016/0022-3093(74)90002-7, 1974.
-  S. Newman and J. B. Lowenstern, “VolatileCalc: a silicate melt–H2O–CO2 solution model written in Visual Basic for excel,” Computers & and Geosciences, Vol.28, Issue 5, pp. 597-604, doi: 10.1016/S0098-3004(01)00081-4, 2002.
-  A. Yasuda, “FT-IR Micro Reflectance Measurements of Water Content in Melt Inclusions,” Bulletin of Volcanological Society of Japan, Vol.56, Issues 2-3, pp. 41-49, doi: 10.18940/kazan.56.2-3_41, 2011 (in Japanese with English abstract).
-  A. Ceglia, G. Nuyts, W. Meulebroeck, S. Cagno, A. Silvestri, A. Zoleo, K. Nys, K. Janssens, H. Thienpont, and H. Terryn, “Iron speciation in soda-lime-silica glass: a comparison of XANES and UV–Vis–NIR spectroscopy,” J. of Analytical Atomic Spectroscopy, Vol.30, Issue 7, pp. 1552-1561, doi: 10.1039/C5JA00046G, 2015.
-  W. E. Jackson, F. Farges, M. Yeager, P. A. Mabrouk, S. Rossano, G. A. Waychunas, E. I. Solomon, and G. E. Brown, Jr., “Multi-spectroscopic study of Fe(II) in silicate glasses: Implications for the coordination environment of Fe(II) in silicate melts,” Geochimica et Cosmochimica Acta, Vol.69, Issue 17, pp. 4315-4332, doi: 10.1016/j.gca.2005.01.008, 2005.
-  V. C. Kress and I. S. Carmichael, “The compressibility of silicate liquids containing Fe2O3 and the effect of composition, temperature, oxygen fugacity and pressure on their redox states,” Contributions to Mineralogy Petrology, Vol.108, Issues 1-2, pp. 82-92, doi: 10.1007/BF00307328, 1991.
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