Tobias P. Fischer

Ph.D., Arizona State University, 1999 (Professor)
(505) 277-0284 Email:

Research and Academic Interests:

Volcanology with emphasis on active volcanism. Geochemistry of fluids discharging from active volcanoes and hydrothermal systems. Flux of volatiles from magmas to the atmosphere during magma ascent and eruption. Element cycling from the mantle and crust to the atmosphere through volcanism. Effects of volcanic plumes on climate. Volatile composition of melts and their influence on eruption style. Field remote sensing, direct sampling and analyses of volcanic and hydrothermal fluids. Current research areas are volcanoes in the Marianas, Japan, Central and South America, the West Indies, and Indonesia.

List of Related Web Links:

Tobias P. Fischer Personal Page
Active Volcanoes
Advanced Volcanology EPS 575
Los Alamos National Laboratory Volcanology Program

Listing of Recent Publications:

Mitchell, E.C.*, Fischer, T.P., Hilton, D.R., Hauri, E., Shaw, A.M., de Moor, J.M., Sharp, Z.D., Kazahaya, K. (2010) Nitrogen sources and recycling at subduction zones: Insights from the Izu-Bonin-Mariana arc. G-cubed, 11, Q02X11, doi:10.1029/2009GC0027832

Sharp, Z.D., Barnes, J.D., Fischer, T.P., Halick, M. (2010) An experimental determination of chlorine isotope fractionation in acid systems and applications to volcanic fumaroles. Geochim. Cosmochim. Acta Volume 74, 264-273

Barnes, J.D, Sharp, Z.D., Fischer, T.P., Hilton, D.R., and Carr, M.J. (2009) Variations in chlorine stable isotopes along the Central American volcanic front and backarc. G-cubed 10, 11, doi:10.1029/2009GC002587, 2009

Ray, M.C., Hilton, D.R., Munoz, J. Fischer, T.P., Shaw, A.M. (2009) Assessing the effects of degassing and crustal contamination on the helium and carbon geochemistry of hydrothermal fluids: insights from the Southern Volcanic Zone of Chile. Chem. Geol.266, 38-49

Crossey, L.C., Karlsstrom, K.E., Springer, A., Newell, D., Hilton D.R., Fischer, T.P. (2009) Degassing of mantle-derived CO2and 3He from springs in the southern Colorado Plateau region-flux rates, neotectonic connections, and implications for understanding groundwater systems GSA Bulletin, 121, 1034-1053

Fischer, T.P., Burnard, P., Marty, B., Hilton, D.R., Furi, E., Palhol, F., Sharp, Z.D., Mangasini, F. (2009) Upper-mantle volatile chemistry at Oldoinyo Lengai volcano and the origin of carbonatites Nature, 459, 77-80 doi:10.1038/nature07977

Mazot, A., Bernard, A., Fischer, T.P., Inguaggiato, S., I.S., Sutawidjaja (2008) Chemical evolution of thermal waters and changes in the hydrothermal system after the November 2002 eruption in the Papandayan volcano (West Java, Indonesia). J. Volcanolo. Geotherm. Res. 178, 276-286

Shaw, A.M., Hauri, E., Fischer, T.P., Hilton, D.R., Kelly, K.H. (2008) Hydrogen isotopes in Mariana arc melt inclusions: implications for subduction dehydration and the deep-Earth water cycle. Earth and Planet. Sci. Let. 275, 138-145

Zellmer, G.F., Fischer, T.P., Chen, C-H. (2008) Evolution, transfer and release of magmas and volcanic gases: an introduction. J. Volcanol. Geotherm. Res. 178 v-vii

Witt, M., Fischer, T.P., Pyle, M.D., Yang, T.F., Zellmer, G.F. (2008) Fumarole compositions and mercury emissions from the Tatun Volcanic Field, Taiwan: Results from real time measurements and direct sampling techniques. J. Volcanol. Geotherm. Res. 178, 636 –643.

Barnes, J. D., Sharp, Z.D., Fischer, T.P. (2008) Chlorine isotope variations across the Izu-Bonin-Mariana arc. Geology 36, 883–886

Newell, D. L., Jessup, M.J., Colte, J.M., Hilton, D.R., Sharp, Z.D., Fischer, T.P. (2008) Aqueous and isotope geochemistry of mineral springs along the southern margin of the Tibetan plateau - Implications for fluid sources and regional degassing of CO2. Geochem. Geophys. Geosyst, 9, Q08014, doi:10.1029/2008GC002021

Fischer, T.P. (2008) Volatile fluxes (H2O, CO2, N2, HCl, HF) from arc volcanoes. Geochemical J., 42, 21-38.

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